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WPO201500058 Calculations 2015-11-01
Rivanna Water and Sewer Authority Moores Creek Advanced Water Resource Recovery Facility - Odor Control Improvements R1VANN A WATER & SEWER AUTHORITY L) Amendment to Approved Water Protection Ordinance #WPO201500058 Including Erosion Control Narrative and Calculations, Stormwater Analysis, and Related Specifications Submitted to: County of Albemarle November 2015 `q�,ALTH t f ZATTH• k DAV1 I Lie. No 52454 fISIONAL I( Hazen NARRATIVE REPORT INTRODUCTION The Rivanna Water and Sewer Authority (RWSA) as a part of their Odor Control Master Plan is proposing construction at the Moores Creek Advanced Water Resource Recovery Facility (MCAWRRF) to treat odor-producing process that regularly disperse beyond the fence line. In 2014 an odor control study using recent sampling data and dispersion models evaluated the current odor conditions at the facility. This project will address the major odor-producing process targeted in the 2014 study. Construction for this project will include a new grit facility, covers for the existing primary clarifiers and headworks channel, and a new centralized odor scrubber system. The new scrubber will replace the existing odor scrubber and will be sized to handle foul air currently treated by the existing facility as well as the Rivanna Pump station and the new grit facility. The existing primary clarifiers are open air structures and a major source for odor at the facility. The proposed clarifiers covers will have a collection system around the perimeter of the tanks that will collect and route stormwater back through the system so that no new impervious surface will be created. The new grit facility will be constructed within existing structures at the facility. Construction of the new grit facility as well as the covers for the primary clarifiers will create no new impervious at the MCAWRRF. Construction of these improvements is anticipated to start in the spring of 2016. The odor control project at the Moores Creek WRRF is proposed as an amendment to previously approved site and erosion control plans SDP #201300033/WPO #201300038. All New proposed construction will take place within the Moores Creek WRRF property. The disturbed area for these improvements is approximately 2.16 acres. Any excess and unsuitable soil will be disposed of in an approved location with all required permits to be acquired by the contractor. Erosion and sediment control measures will be used to limit erosion and contain sediment from the construction and cleared areas prior to the establishment of vegetation. SOILS As a result of the plant's large footprint, a wide variety of soil types exist on site. These soils have been identified and classed by the Natural Resources Conservation Service (NRCS), and are detailed below. 12D, 12E — Catoctin Silt Loam The Catoctin series soils exist on ridges and side slopes in the Northern Piedmont plateau and Blue Ridge Mountains. The soils nearly level to very steep with slope gradients ranging from about 0 to 80 percent. Catoctin soils formed in material weathered from greenstone and other dark colored rocks. This soil is well drained, producing medium or moderately rapid runoff, with a moderately rapid permeability. Commonly found in Virginia, Maryland and Pennsylvania. 13D — Catoctin Very Stony Silt Loam This soil portrays the same characteristics as the Catoctin soil listed above, yet contains approximately 7 percent cobble, stones, or boulders. 23B, 23C — Davidson Clay Loam Nino. The Davidson series consists of very deep, well drained, moderately permeable soils that formed in materials weathered from dark colored rocks high in ferromagnesian minerals. These soils are on gently sloping to moderately steep uplands in the Piedmont. Slopes range from 2 to 15 percent. Commonly found in Alabama, Georgia, North and South Carolina, and Virginia. 55B — McQueen Loam The McQueen series consists of very deep, well drained, slowly permeable soils on stream terraces at low to intermediate elevations above the flood plain. They formed in stratified clayey and loamy alluvial sediments. Slopes commonly are 0 to 5 percent but range from 0 to 15 percent. Commonly found in Alabama, North Carolina and Virginia. 58D — Myersville Silt Loam The Myersville series consists of deep, well drained soils formed in material weathered from basic crystalline rocks, including greenstone, on nearly level to very steep uplands. Permeability is moderate, and slopes range from 0 to 80 percent. Commonly found in Virginia, Maryland, Pennsylvania and West Virginia. 71C, 71D— Rabun Clav Loam The Rabun series consists of dark brownish-red clay, which is deep, moderately drained soils on slopes and rolling areas, with a gradient ranging from 3 to 15 percent. Commonly found in Virginia and North Carolina. 77 — Riverview-Chewacla Complex This series consists of a mix of both Riverview and Chewacla soils, in approximate proportions of 50 percent Riverview to 40 percent Chewacla. This complex tend to be moderately deep, well '`" drained, medium-textured alluvial soils on flood plains of streams, formed by materials washed from surrounding uplands. Runoff is slow with moderate permeability. Slopes range from 0 to 2 percent. 83—Toccoa Fine Sandy Loam The Toccoa series consists of very deep, well drained to moderately well drained soils formed of loamy and sandy alluvium from igneous and metamorphic rocks. Typically found in low to flat areas of the Piedmont and Upper Coastal Plains, with slopes ranging from 0 to 4 percent. Commonly found in Alabama, North Carolina, Georgia, South Carolina and Virginia. 88 - Udorthents This soil series consists of nearly level and gently sloping areas where the original soils have been cut away or covered with a loamy fill material. Most areas have been graded to a smooth surface. Areas are dominantly on uplands but are in almost every landscape position. This soil is moderately drained, with a moderate to slow permeability. Slopes are smooth or irregular, and range from 0 to 25 percent but are dominantly 0 to 5 percent. ADJACENT AREAS Land use immediately surrounding the property is primarily low development, undeveloped, and scattered industrial areas. The property is bounded to the north and west by individually owned industrial lots, some developed as private businesses, others completely undeveloped. To the east, the property is bounded by the Rivanna River. The parcel shares its southern boundary with a VDOT public right-of-way, occupied by US Interstate 64. All minimum yard requirements are met for this parcel along its boundaries. As a result of all similarly zoned properties `rr surrounding the MCAWRRF parcel, this parcel is exempt from setbacks, buffers, and '.."` landscaped screening. EROSION AND SEDIMENT CONTROL MEASURES Erosion and sediment control devices and measures have been designed and placed in accordance with the Virginia Erosion and Sediment Control Handbook (VESCH), Third Edition, 1992. Temporary measures will be used to limit erosion and contain sediment from cleared areas prior to the establishment of vegetation. Once construction, including all structural measures, is complete and permanent vegetative cover has been established, these measures may be removed with approval from the engineer. Vegetative cover for disturbed areas will consist of grasses as recommended by the Virginia Erosion and Sediment Control Handbook. See the Plans and Specification Section 02910 — Final Grading and Landscaping for the proposed Seeding schedule, attached. The temporary measures proposed for this amendment addition includes silt fence, construction entrances, inlet erosion control and temporary seeding measures as required. The above devices will filter sediment from run-off to prevent sediment from being deposited off-site, while the temporary seeding will limit erosion during construction activities. See Specification Section 02276 — Erosion and Sedimentation Control and Section 02910 — Final Grading and Landscaping for further details on these temporary and permanent measures. Temporary Stabilization A majority of the temporary sediment and erosion control measures where designed and ''g•- chosen based on criteria from the Virginia Erosion and Sediment Control Handbook. Stabilization construction entrances/exits and silt fence are designed in accordance with the guidelines established in VESCH Sections 3.02 and 3.05. Temporary seeding measures were chosen as per the recommendations of VESCH Section 3.31. Temporary rolled erosion control mat was designed in accordance with the procedures outlined in Section 3.36. Permanent Stabilization Upon completion of the project, permanent vegetative plantings will be used to achieve stabilization of the site. All temporary erosion and sediment control measures will be removed once the site has been stabilized. All permanent vegetative plantings conform to those specified in the VESCH Section 3.32. See Specification Section 02910 — Final Grading and Landscaping, attached, for the proposed seeding schedule. Erosion Control Sequence 1) No demolition, construction or land disturbance activities may begin until all perimeter erosion control measures have been installed in locations as shown on the Contract Drawings. If clearing is required for installation of a particular measure, all other measures shown shall be installed first. The clearing of the land necessary for installation of the particular measure may then proceed. 2) Once all measures have been installed, the site shall be cleared and grubbed as necessary within the limits of disturbance as shown on the Contract Drawings. Efforts shall be made to minimize the amount of cleared area exposed at any given time. 3) Once clearing and grubbing is complete, any necessary topsoil stripping may begin. Topsoil shall be stockpiled on site in the stockpiling areas shown on the Contract Drawings. Stockpile shall receive such temporary seeding measures as may be required. Any soil taken offsite shall be stockpiled at locations with all required permits. If offsite location does not have all required permits, the contractor is responsible for obtaining any required permits. 4) Demolition, earthwork and construction operations may begin once topsoil has been removed and stockpiled. 5) All pipes shall be installed in accordance with standard construction techniques. Only the length of trench in which pipe can be installed in one days time shall be open at any time, with spoil material placed on the uphill side of the trench. Piping shall be capped at end of each days work to prevent sediment from entering. Trench shall be backfilled at end of each days work and disturbed area seeded and mulched within seven (7) days of backfill. 6) Temporary soil stabilization shall be applied within seven (7) days to denuded areas that may not be at final grade but will remain dormant for longer than fourteen (14) days, except for that portion of the site on which work will be continuous beyond fourteen (14)days. 7) Once construction activities are complete, final grading may begin. 8) Upon completion of final grading, permanent seeding, mulching and fertilizing measures shall be employed on all disturbed areas as per Section 02910 — Final Grading and Landscaping. Permanent soil stabilization shall be applied within seven (7) days after final grade is reached on any portion of the site. All erosion control measures shall remain in place until entire site has been stabilized. 9) Once permanent stabilization has occurred, temporary sediment control measures shall be removed. Any areas disturbed by the removal of these measures shall be returned as closely as possible to original condition and seeded, mulched and fertilized as per Specification Section 02910. Maintenance and Sediment Disposal All sediment and erosion control measures shall be inspected upon installation, at least once every fourteen (14) days and within 48 hours following any runoff producing rainfall event. Repairs to, or replacement of, measures shall occur immediately if necessary and accumulated sediment removed as needed. Sediment shall be removed from all erosion control measures when the sediment storage volume of the measure has become 50% full. All removed sediment shall be disposed of in an approved manner at the stockpile location or a location to be designated by the Engineer or Owner. Steps shall be taken at the disposal site to insure that further sediment transport does not occur. All disturbed areas shall be permanently seeded as soon as possible, but in no case later than seven (7) calendar days after construction activities are complete. Areas shall be seeded, fertilized and mulched in accordance with the Seeding schedule in Section 02910 — Final Grading and Landscaping, of the Specifications. STORMWATER ANALYSIS Introduction This stormwater analysis has been prepared in response to the Odor Control Project at the Moores Creek Advanced Water Resource Recovery Facility. The material provided in this analysis evaluates how the proposed project will affect stormwater runoff and nutrient export from the site. All material provided in this analysis has been prepared and is presented in general accordance with the guidelines outlined in the Albemarle County Water Protection Ordinance. This analysis focuses on 2 areas: storm water quantity and storm water quality. The area of the study currently consists of approximately 2.16 acres; a combination of grassed areas, buildings, tanks, and other impervious cover such as roadway, structures and sidewalk. The runoff in the project areas are collected in a series of catch basins and inlets that ultimately discharge into Moores Creek. The area of analysis for this project consist of the limits of disturbance for the project improvements. A large portion of the improvements for the project will be the installation of piping that will be installed mostly on maintained grass and some asphalt pavement surfaces on site. Methodologies and Procedures The primary task of this stormwater analysis is to determine the degree of stormwater treatment required for the proposed project for quantity, quality and adequacy. The extent of this analysis accounted for the following factors: the location of the project site, the size of the site respective to the total watershed, and the degree of proposed development. Channel Protection (VA Minimum Standard 19, 9VAC25-870-66) Minimum Standard 19 states that, "Properties and waterways downstream from development sites shall be protected from sediment deposition, erosion and damage due to increase in volume, velocity and peak flow rate of stormwater runoff for the stated frequency storm of 24-hour duration". In order to comply with these standards all concentrated stormwater runoff leaving the site needed to be discharged into adequate sized channels and stormwater pipes." MS-19 states that channel adequacy may be verified by proving that, "total drainage area to the point of analysis within the channel is one hundred times greater than the contributing drainage area of the project in question" According to the Albemarle County, VA Flood Insurance Study revised on April 2, 2014 (attached in Appendix C), the total contributing drainage area at the mouth of Moores Creek (just downstream of the MCAWRRF) is approximately 30.9 mi2, much greater than the sum of the parcel areas that make up the MCAWRRF (12.59 acres, 0.020 mi2). According to Minimum Standard 19, channel adequacy shall by verified by: "Pipes and storm sewer systems shall be analyzed by the use of a ten-year storm to verify that stormwater will be contained within the pipe or system." The proposed development for this project drains to an existing storm sewer network. In an effort to comply with minimum standard 19, this network had to be analyzed for containment of flow. The pipe network was input into HydraFlow StormSewers to model conditions before and after development from this project. It was determined that the current pipe network is adequate for capture of the 10-year storm. Pipe network data are provided in the MS-19 Compliance Calculations sections of Appendix D of this report. Downstream stability analysis was performed for the 10-year storm to determine if erosion will occur at the pipe network outfall. It was determined that the current outlet stabilization at the outfall of the pipe network meets stabilization requirements to the 10-year storm. See Appendix D for calculations. Water Quality Concerns Pre-development and post-development land cover were entered into the Virginia Runoff Reduction Method (VA RRM) Worksheet to calculate the required phosphorus removal onsite. According to the VA RRM Spreadsheet, the required removal rate of phosphorus for the proposed development is 0.36 lb/yr. Proposed Storm water Measures Due to a limited construction area, limited available space, and existing roadways onsite, two FilterraTM Bioretention Filter Systems were chosen to treat runoff. Because of the high efficiency of this practice to treat and infiltrate stormwater, it was not necessary or practical to send the entire disturbed area to the BMP. Rather, areas outside of the limits of disturbance were treated to ensure compliance on a site level. The BMPs were evaluated in the VA RRM Spreadsheet to determine whether they received and treated enough stormwater pollutant to reach the target removal of 0.36 lb/yr of phosphorus. It was determined that the FilterraTM units remove a total of 0.48 lb/yr of phosphorus, meeting the target removal, with an excess nutrient credit of 0.12 lb/yr. VA RRM worksheets are included in Appendix D; details are included in the Contract Drawings. Conclusion The proposed site, which is located adjacent to the floodplain, is exempt from controlling the peak rate and velocity of runoff for the project based on the exemptions listed in Albemarle County's Water Protection Ordinance. However, a stormwater analysis of the project's pipe network was evaluated to ensure adequacy based on the compliance of Minimum Standards 19. No change in the existing pipe network is necessary to meet the requirements of Minimum Standard 19. All stormwater analysis calculations can be found in Appendix D of this report. Using the VA RRM Spreadsheet, it was determined the site is required to reduce post- construction storm pollutant export by 0.36 lbs, requiring two FilterraTM units to reduce and treat stormwater runoff. The BMPs will meet requirements by removing 0.48 lbs of total phosphorus. Under these proposed conditions for the management/treatment of stormwater runoff, the Moores Creek Advanced Water Resource Recovery Facility improvement is under compliance of all applicable performance standards and requirements MITIGATION PLAN Land disturbance within the buffer includes the installation of underground piping. All new construction will be located on the existing site within the property boundaries. Portions of the existing plant are located within the 100-year Floodplain and the 100-foot stream buffer of Moores Creek, and there is one location in which the proposed MCAWRRF process improvements require disturbance within this buffer. Disturbed area within the stream buffer is approximately 1889 sf, including a trench for a proposed pipe and associated erosion control measures. Project Justification •�.. A. (The proposed development shall be located on those portions of a site and in a manner that will be least disruptive to the natural functions of the stream buffer.) Plant upgrade facilities have been placed as far outside of the 100-foot stream buffer as possible while still meeting the hydraulic elevation requirements of the MCAWRRF process improvements. The proposed piping minimizes clearing of existing trees within the stream buffer, and utilizes areas of the stream buffer that are not currently vegetated with buffer plantings. B. (No more land shall be disturbed than is necessary to allow a development that is permitted in the underlying zoning district under the applicable regulations of the Zoning Ordinance.) The limits of disturbance will be tightly controlled to minimize the amount of land disturbance necessary while still allowing the necessary MCAWRRF process improvements to take place. C. (Native vegetation shall be preserved to the fullest extent practicable, consistent with the proposed development.) Native vegetation will be preserved to the extent practical by controlling the limits of construction disturbance and minimizing the amount of land disturbance necessary. Mitigation planting will utilize native species wherever possible and practical. Mitigation Measures In general, the project results in temporary disturbance within the 100-foot stream buffer. The temporary disturbance is in a buffer area that is currently a mix of wooded and grassed and will require mitigation plantings to replace the vegetation lost during the disturbance. Criteria in the Riparian Buffers Guidance Manual (Chapter 5.1) will be used to determine replacement plants. The additional area within the stream buffer to be planted with riparian vegetation is 3,600 sf, ``"' meeting the 2:1 requirement for stream buffer planting. The proposed mitigation area can be seen on drawing C9, attached. Mitigation Planting Plan The total area to receive mitigation plantings on the site is approximately 3,600 ft2. This will require a total planting of 6 canopy trees, 6 understory trees, and 6 shrubs as required by the "Riparian Buffers Modification and Mitigation Guidance Manual," Appendix D, Virginia Department of Conservation and Recreation. Plant species were chosen based off of planting recommendations from the "Riparian Buffers Modification and Mitigation Guidance Manual," Appendix A. The Contractor may choose one or more of the following species from each category of plant to be installed: Canopy Tree: Red maple (Acer rubrum), Paw paw (Asimina triloba), White ash (Fraxinus americana), Willow oak (Quercus palustris), Black walnut (Juglans nigra) Understory Tree: American wild plum (Prunus americana), Eastern redbud (Cercis canadensis), Sweetbay Magnolia (Magnolia virginiana) Small Shrub: American Filbert (Corylus americana), Wild Hydrangea (Hydrangea arborescens), Mountain Laurel (Kalmia latifolia) Contractor shall protect mitigation plantings at all times during construction activities with tree ''....., protection fence or other measures to insure mitigation area is not disturbed throughout period of establishment. Albemarle County shall protect restored or replanted mitigation areas through the establishment of easements or maintenance agreements for each stream buffer mitigation planting area. Planting Schedule Trees and shrubs should be planted in the spring or fall while plants are dormant. The preferred time for deciduous species is spring (late February/early March to May 1st before bud break). The Contractor shall hire a professional arborist or forester, as approved by RWSA, to prepare a mitigation planting plan and schedule based on the requirement noted above. Fall planting can take place after the leaves have fallen off deciduous plant material. Evergreen material can be planted during the same time periods as deciduous plants, although their dormancy period is shorter. Fall plantings should be well watered and mulched to prevent winter desiccation. Plants should not be planted in frozen ground. Contractor shall complete mitigation planting within 21 days of completion of land disturbance activity within each designated buffer mitigation area. Contractor shall maintain mitigation buffer planting for a period of one year following completion of mitigation planting. At the end of one year of maintenance, contractor shall hire a professional arborist or forester, as approved by RWSA, to prepare a report on the acceptability of mitigation planting survival. Contractor shall correct any deficiencies in mitigation planting as identified in the prepared Contractor shall correct any deficiencies in mitigation planting as identified in the prepared report. Mitigation Planting Maintenance Invasive species such as grasses and vines shall be controlled around new plantings. Provide mulch, geotextiles, mechanical means, chemical applications, tree shelters, or other means as necessary to control invasive species after planting. The ground between new plantings should be covered with native grasses or mulch to prevent erosion. Plantings should be checked for, and cleared of, invasive species and watered once a week if less than 1" of rain has been received in the previous seven days. Provide signs and fencing as appropriate to prevent mowing within the re-planted buffer area during plant establishment. Contractor shall provide a maintenance plan prepared by a professional arborist or forester, as approved by RWSA, recommending long-term maintenance practices for the RWSA to follow for all mitigation planting areas. RWSA understands Albemarle County may require a bond with surety or other acceptable instrument, which agreement and bond with surety or other acceptable instrument shall be of a substance and in a form approved by the program authority and the county attorney to insure on-going maintenance of the mitigation planning areas. CRITICAL SLOPES Critical slopes, as defined by the County of Albemarle, are areas of topographic inclines that exceed a 25% slope. Due to the location of the plant being divided by Moores Creek, the property is within the Steep Slope Overlay district as it contains both preserved and managed slopes as defined by Albemarle County. Foul Odor piping is needed to connect odor from plant structures on both sides of Moores Creek to the new Odor Control Facility. To connect existing structures with odor control piping there will need to be piping routed across Moores Creek; However, there will be no cutting or disturbance of Moores as piping will be installed aerially along an existing piping corridor that runs just under the Moores Creek bridge. There will be a small amount of disturbance in these area to provided construction access and pipe installation to the existing bridge. A small amount of this construction will take place within the County's preserved slopes and special effort has been taken to provide the least amount of disturbance within these areas. Once piping has been installed, erosion control matting will be provided for stability until the area can be restored to its original condition and elevation. There will be no post construction stormwater run-off as a result of construction within the preserved slopes. Albemarle County Code, Chapter 18 Section 30.7.4 (c) states, "Necessary public facilities. Public facilities necessary to allow the use of the lot, provided that the lot does not contain adequate land area outside of the preserved slopes to locate the public facilities and one or more of the following exist". The existing Moores Creek Advanced Water Resource Recovery Facility is a necessary public facility that requires connection of process facility's on both sides of Moores Creek and within the County's preserved slopes. All other disturbance of these slopes for this project will be within the County's managed steep slopes. A majority of this disturbance will be for the temporary disturbance of pipe installation and construction access. These areas will be protected with erosion control devices and restored to their original condition and grade. A new Odor Control Facility will be installed within the limits of a managed steep slope. See sheet Cl-A for the limits of disturbance within the County's steep slopes. All disturbance within these slopes shall meet the regulations described in the Albemarle County Code, Chapter 18 Section 30.7.5. Appendices Appendix A—Site Plan/WPO Amendment Applications Appendix B—Contract Drawings Appendix C—VA Flood Insurance Study Appendix D—Stormwater Analysis Calculations Appendix E—Specifications Section 02050— Demolition Section 02100—Clearing, Grubbing, and Site Preparation Section 02140— Dewatering "re Section 02200 — Earthwork Section 02207 —Aggregate Materials Section 02274— Geotextiles Section 02276— Erosion and Sedimentation Control Section 02500—Surface Restoration Section 02510— Paving and Surfacing Section 02604— Utility Structures Section 02831 — Steel Fencing Section 02910— Final Grading and Landscaping 1 i a1p./ Appendix A Site Plan/ WPO Amendment Applications (Under Separate Cover) 2 Appendix B Contract Drawings (Under Separate Cover) H&S Project No.31037-042 Rivanna Pump Station Site Plan Amendment 3 Appendix C VA Flood Insurance Study H&S Project No.31037-042 Rivanna Pump Station Site Plan Amendment ,c !Aire, ,/1� FLOOD . 1NSURANCE�r r � STUDY - V, ti, • 44kciumw Vow' Albemarle County ALBEMARLE COUNTY, �►d!�!�, �-- VIRGINIA ,��►i '�'•'��`0� AND INCORPORATED AREAS *Nolo*1a�j'�ratej AND THE INDEPENDENT CITY OF CHARLOTTESVILLE COMMUNITY NAME COMMUNITY NUMBER ALBEMARLE COUNT( (UNINCORPORATED AREAS) 510006 CHARLOTTESVILLE,CITY OF 510033 (INDEPENDENT CITY) SCOTTSVILLE,TOWN OF 510007 1e1+1174( Revised: April 2, 2014 Federal Emergency Management Agency 41). FLOOD INSURANCE STUDY NUMBER 510030V000B '" TABLE 3 -SUMMARY OF DISCHARGES-continued FLOODING SOURCE DRAINAGE AREA PEAK DISCHARGES (cfs) AND LOCATION (sq. miles) 10-YEAR 50-YEAR 100-YEAR 500-YEAR JACOBS RUN At confluence with North Fork Rivanna River 6.38 220 850 1,310 3,460 Downstream of Chris Green Lake Dam 5.98 170 820 1,270 3,460 JAMES RIVER Upstream of confluence with the Rivanna River 5,056 114,400 195,200 245,800 423,700 At mouth of the Hardware River 4,749 107,900 184,100 232,000 398,100 At State Route 20 4,584 104,000 177,700 224,000 382,000 JUMPING BRANCH At mouth 2.8 850 1,480 1,830 2,890 LICKINGHOLE CREEK At confluence with Mechums River 13.6 2,680 4,750 5,500 8,030 N,.,,. Upstream of Slabtown Branch 9.41 2,110 3,700 4,260 6,120 Upstream of Powells Creek 5.44 1,200 2,200 2,590 3,920 Upstream study limits 2.95 670 1,240 1,470 2,240 LITTLE IVY CREEK At mouth 3.9 1,090 1,930 2,410 3,860 MINK CREEK At mouth 1.34 580* 820* 920 1,090 MEADOW CREEK At confluence with Rivanna River 9.2 3,200 5,500 7,000 11,000 At State Route 631 8.4 2,700 4,500 6,000 9,000 At Southern Railway 3.6 1,800 3,000 4,000 6,300 MECHUMS RIVER At mouth 99.1 9,800 20,100 25,000 47,800 MOORES CREEK At mouth 30.9 4,840 9,450 12,200 21,300 *Not shown on profile 14 4 Appendix D Stormwater Analysis H&S Project No.31037-042 Rivanna Pump Station Site Plan Amendment Virginia Runoff Reduction Method Spreadsheet H&S Project No.31037-042 Rivanna Pump Station Site Plan Amendment Virginia Runoff Reduction Method Worksheet Virginia Runoff Reduction Method ReDevelopment Worksheet-v2.8-June 2014 Site Data Summary Total Rainfall=43 inches Site Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.10 0.00 0.00 0.10 4.63 Turf(acres) 0.00 1.62 0.00 0.00 1.62 75.00 Impervious(acres) 0.00 0.44 0.00 0.00 0.44 20.37 2.16 100.00 Site Rv 0.34 Post Development Treatment Volume(ft3) 2704 Post Development TP Load(Ib/yr) 1.70 Post Development TN Load(Ib/yr) 12.16 Total TP Load Reduction Required(Ib/yr) 0.36 Total Runoff Volume Reduction(ft3) 0.00 Total TP Load Reduction Achieved(lb/yr) 0.48 Total TN Load Reduction Achieved(lb/yr) 0.00 Adjusted Post Development TP Load(Ib/yr) 1.22 Remaining Phosphorous Load Reduction(Lb/yr)Required 0. Drainage Area Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 0.37 0.31 0.00 0.00 0.00 0.68 Impervious(acres) 0.16 0.14 0.00 0.00 0.00 0.30 0.98 'rr, Drainage Area Compliance Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total TP Load Red.(Ib/yr) 0.26 0.22 0.00 0.00 0.00 0.48 TN Load Red.(Ib/yr) 0.00 0.00 0.00 0.00 0.00 0.00 Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area A Summary Land Cover Summary LNoomp- A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 0.00 0.37 0.00 0.00 0.37 69.81 Impervious(acres) 0.00 0.16 0.00 0.00 0.16 30.19 0.53 BMP Selections Practice Credit Area(acres) Downstream Practice Filterra Impervious: 0.16 Turf(Pervious): 0.37 Total Impervious Cover Treated(acres) 0.16 Total Turf Area Treated(acres) 0.37 Total TP Load Reduction Achieved in D.A.A(Ib/yr) 0.26 Total TN Load Reduction Achieved in D.A.A(lb/yr) 0.00 'wow Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area B Summary Land Cover Summary lour A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 0.00 0.31 0.00 0.00 0.31 68.89 Impervious(acres) 0.00 0.14 0.00 0.00 0.14 31.11 0.45 BMP Selections Practice Credit Area(acres) Downstream Practice Filterra Impervious: 0.14 Turf(Pervious): 0.31 Total Impervious Cover Treated(acres) 0.14 Total Turf Area Treated(acres) 0.31 Total TP Load Reduction Achieved in D.A.A(Ib/yr) 0.22 Total TN Load Reduction Achieved in D.A.A(Ib/yr) 0.00 Nor Summary Print Filterra Drainage Area Map H&S Project No.31037-042 Rivanna Pump Station Site Plan Amendment ,n-sgpi II ; 1 ii,If il it • I I, . 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J .= in r03 rNi rt r'5 ii WN C N .I.5: oJ Outlet Protection Calculations H&S Project No.31037-042 Rivanna Pump Station Site Plan Amendment DESIGN OF RIPRAP OUTLET PROTECTION Designed By: Corinne Wilson, EIT Date: 8/10/2015 Company: Hazen and Sawyer, P.C. Project Name: Moores Creek Advanced WRRF Odor Control Improvements Project No.: 32309-006 Site Location (City/Town) Charlottesville,VA Culvert Id. Outfall Total Drainage Area(acres) 5.45 Step 1. Determine the tailwater depth from channel characteristics below the pipe outlet for the design capacity of the pipe. If the tailwater depth is less than half the outlet pipe diameter. it is classified minimum tailwater condition. If it is greater than half the pipe diameter. it is classified maximum condition. Pipes that outlet onto wide flat areas with no defined channel are assumed to have a minimum tailwater condition unless reliable flood staee elevations show otherwise. Rational Method for Flow Outlet pipe diameter, Do (in.) 36 Tailwater depth (in.) 5.28 Minimum/Maximum tailwater? Min TW (Fig. 8.06a) Discharge(cfs) 12.0 Velocity(ft./s) 11.91 Step 2. Based on the tailwater conditions determined in step I. enter Figure 8.06a or Figure 8.06b.and determine d50 riprap size and minimum apron length (L). The d;. size is the median stone size in a well-graded nprap apron. Step 3. Determine apron width at the pipe outlet. the apron shape_ and the apron width at the outlet end from the same figure used in Step 2. Minimum TW New, Figure 8.06a Riprap d50, (ft.) 0.75 Minimum apron length, La (ft.) 20 Apron width at pipe outlet(ft.) 9 Apron shape wedge Apron width at outlet end (ft.) 23 Step 4. Determine the maximum stone diameter: dm„ = 1.5xdm) Minimum TW Max Stone Diameter, dmax(ft.) 1.125 Step 5. Determine the apron thickness: Apron thickness = 1.5 x Minimum TW Apron Thickness(ft.) 1.6875 Step 6. Fit the nprap apron to the site by making it level for the minimum m length.. L.. from Figure 8.06a or Figure 8.06b. Extend the apron farther downstream and along channel banks until stability is assured. Keep the apron as straight as possible and align it with the flow of the receiving stream. '41111111` Make any necessary alignment bends near the pipe outlet so that the entrance into the receiving stream is straight. Some locations may require lining of the entire channel cross section to assure stability. It may be necessary to increase the size of riprap where protection of the channel side slopes is necessary- (Appendix S.05). Where overfills exist at pipe outlets or flows are excessive. a plunge pool should be considered. see page 8.06.8_ Recommended Riprap Apron Size Actual Apron Size Apron Length (ft.) 20 22 Apron Width (ft.) 9 9 Thickness of Stone(ft.) 1.7 2 NCDOT Stone Class Class Al Class Al Current outlet protection is sufficient to resist erosion for the 10-year storm Channel Calculations ems, H&S Project No.31037-042 Rivanna Pump Station Site Plan Amendment Channel Calculations-Eastern Channel Near Project: Moores Creek Odor Control Client: Rivanna Water and Sewer Authority Location: Charlottesville,NC Objective: Design channel to convey flow in a non erosive manner Channels will be designed to carry flow generated by the 10-Year storm event using maximum slope. Calculations: Rational Method: Q=C*I*A Where Q=Flow(cfs) C=Runoff Coefficient I=Rainfall Intensity(in/hr) A=Drainage Area(ac) Find C value in Reference 2 Find Intensity for 10-year event in Reference 2 C= 0.3 I= 6.62 Drainage area(A)(ac)= 0.32 Q(cfs)= 0.6 Check channel for adequate depth and for need for armoring Assume 2.5 ft/s as maximum allowable velocity for bare earth and 4.5 ft/s as maximum allowable velocity for grass lined Design channel lining using tractive force procedure Calculations will be done using Manning's Equation to find normal depth and Continuity(Q=V*A)to find velocity. Q(cfs)= 0.6 Smax(ft/ft)=0.11 B(ft)= 0 M(ft)= 3 Channel cross section Calculate normal depth and velocity with bare earth as lining From Ref.2, n= 0.02 Flow(cfs)= 3.1 normal depth(ft)= 0.4 velocity(ft/s)= 1.58 NO LINING IS REQUIRED Calculate normal depth and velocity with grass as lining From Ref.2, n= 0.03 Flow(cfs)= 3.1 normal depth(ft)= 0.4 velocity(ft/s)= 1.17 NO LINING REQUIRED 'erm-Temp Channel Calcs NO LINING IS REQUIRED From product manual,n= 0.031 Flow(cfs)= 3.1 normal depth(ft)= 0.4 velocity(ft/s)= 1.14 Calculate shear stress Shear stress(Ib/ft2)=(62.4 Ib/ft3)*(normal depth)*(slope) shear stress(lb/ft 2 )= 2.96 NO LINING REQUIRED shear stress(lb/ft 2)= 3.00 Max Permissible Shear Max Velocity Unvegetated Vegetated Unvegetated Vegetated Lining Type Manufaturer and Model 'n'1 lbs/ft2 lbs/ft2 ft/s ft/s Straw w/Net-RECM North American Green-S150 0.044 1.75 N/A 6.00 N/A Coconut Fiber-RECM North American Green-C125 0.019 2.25 N/A 10.00 N/A Polypropylene Mat-TRM North American Green-P300 0.029 3.00 8.00 9.00 16.00 Polypropylene Mat-TRM North American Green-P550 0.031 4.00 14.00 12.50 25.00 1 n value interpolated for normal depth of 1.0 ft 'War* 'erm-Temp Channel Calcs Channel Calculations-Western Channel New Project: Moores Creek Odor Control Client: Rivanna Water and Sewer Authority Location: Charlottesville,NC Objective: Design channel to convey flow in a non erosive manner Channels will be designed to carry flow generated by the 10-Year storm event using maximum slope. Calculations: Rational Method: Q=C*I`A Where 0=Flow(cfs) C=Runoff Coefficient I=Rainfall Intensity(in/hr) A=Drainage Area(ac) Find C value in Reference 2 Find Intensity for 10-year event in Reference 2 C= 0.3 I= 6.62 Drainage area(A)(ac)= 0.21 Q(cfs)= 0.4 Check channel for adequate depth and for need for armoring Assume 2.5 fUs as maximum allowable velocity for bare earth and 4.5 ft/s as maximum allowable velocity for grass lined Design channel lining using tractive force procedure Calculations will be done using Manning's Equation to find normal depth and Continuity(Q=V*A)to find velocity. Q(cfs)= 0.4 Smax(ft/ft)=0.11 B(ft)= 0 M(ft)= 3 Channel cross section Calculate normal depth and velocity with bare earth as lining From Ref.2, n= 0.02 Flow(cfs)= 3.1 normal depth(ft)= 0.4 velocity(ft/s)= 1.04 NO LINING IS REQUIRED - Calculate normal depth and velocity with grass as lining From Ref.2, n= 0.03 Flow(cfs)= 3.1 normal depth(ft)= 0.4 velocity(his)= 0.76 NO LINING REQUIRED 'erm-Temp Channel Calcs __age NO LINING IS REQUIRED From product manual,n= 0.031 Flow(cfs)= 3.1 normal depth(ft)= 0.4 velocity(ft/s)= 0.75 Calculate shear stress Shear stress(Ib/ft2)=(62.4 Ib/ft3)*(normal depth)*(slope) shear stress(lb/ft2 )= 2.96 NO LINING REQUIRED shear stress(lb/ft2)= 3.00 Max Permissible Shear Max Velocity Unvegetated Vegetated Unvegetated Vegetated Lining Type Manufaturer and Model 'n'1 lbs/ft2 lbs/ft2 his ft/s Straw w/Net-RECM North American Green-S150 0.044 1.75 N/A 6.00 N/A Coconut Fiber-RECM North Amencan Green-C125 0.019 2.25 N/A 10.00 N/A Polypropylene Mat-TRM North American Green-P300 0.029 3.00 8.00 9.00 16.00 Polypropylene Mat-TRM North American Green-P550 0.031 4.00 14.00 12.50 25.00 n value interpolated for normal depth of 1.0 ft 'erm-Temp Channel Calcs 5 SECTION 02050 DEMOLITION PART 1 -- GENERAL 1.01 THE REQUIREMENT A. The Contractor shall furnish all labor, materials and equipment in accordance with the requirements of Section 01520-Maintenance of Utility Operations During Construction and Section 01540 - Demolition and Removal of Existing Structures and Equipment. B. In addition, the Contractor shall demolish and remove all concrete and asphaltic paving, curbs,sidewalk, and miscellaneous yard structures as required and shown on the Contract Drawings during the construction work. 1.02 RELATED WORK SPECIFIED ELSEWHERE A. Section 01090 - Reference Standards B. Section 01520 - Maintenance of Utility Operations During Construction C. Section 01540 - Demolition and Removal of Existing Structures and Equipment ‘.,.0, 1.03 REFERENCE SPECIFICATIONS, CODES, AND STANDARDS A. References shall be in accordance with reference standards, codes, and specifications as set forth herein and in Section 02100 - Clearing, Grubbing, and Site Preparation. PART 2 -- EXECUTION 2.01 DEMOLITION A. Existing concrete and asphaltic paving, curbs, sidewalk and miscellaneous yard structures within the areas designated for new construction work shall be completely demolished and all debris removed from the site. B. Excavation caused by demolition shall be backfilled with fill free from rubbish and debris. C. Work shall be performed in such manner as not to endanger the safety of the workmen or the public or cause damage to nearby structures. 0 A D. Provide all barriers and precautionary measures in accordance with Owner's requirements and other authorities having jurisdiction. 1, E. Where parts of existing structures are to remain in service, demolish the portions to be removed, repair damage, and leave the structure in proper condition for the intended use. Remove concrete and masonry to the lines designated by drilling,chipping,or other suitable 32309-006102050:08-03-15 02050-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS SECTION 02100 CLEARING, GRUBBING, AND SITE PREPARATION PART 1 -- GENERAL 1.01 THE REQUIREMENT A. Includes all labor, material, equipment and appliances required for the complete execution of any additions, modifications, or alterations to existing building(s) and new construction work as shown on the Drawings and specified herein. B. Principal items of work include: 1. Notifying all authorities owning utility lines running to or on the property. Protecting and maintaining all utility lines to remain and capping those that are not required in accordance with instructions of the Utility Companies, and all other authorities having jurisdiction. 2. Clearing the site within the Contract Limit Lines, including removal of grass, brush, shrubs, trees, loose debris and other encumbrances except for trees marked to remain. 3. Boxing and protecting all trees, shrubs, lawns and the like within areas to be preserved. Relocating trees and shrubs, so indicated on the Drawings, to designated areas. 4. Repairing all injury to trees, shrubs, and other plants caused by site preparation operations shall be repaired immediately. Work shall be done by qualified personnel in accordance with standard horticultural practice and as approved by the Engineer. 5. Removing topsoil to its full depth from designated areas and stockpiling on site where directed by the Engineer for future use. 6. Disposing from the site all debris resulting from work under this Section. 1.02 RELATED WORK SPECIFIED ELSEWHERE A. Section 02200- Earthwork 1.03 REFERENCE SPECIFICATIONS, CODES, AND STANDARDS A. Virginia Administrative Code, Title 9 1.04 STREET AND ROAD BLOCKAGE A. Closing of streets and roads during progress of the work shall be in compliance with the requirements of the Owner and other authorities having jurisdiction. Access shall be provided to all facilities remaining in operation. 32309-006102100:08-03-15 02100-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS C. Care shall be taken not to contaminate the stockpiled topsoil with any unsuitable materials. 2.03 GRUBBING A. Grubbing shall consist of the removal and disposal of all stumps, roots, logs, sticks and other perishable materials to a depth of at least 6-inches below ground surfaces. B. Large stumps located in areas to be excavated may be removed during grading operations, subject to the approval of the Engineer. 2.04 DISPOSAL OF MATERIAL A. All debris resulting from the clearing and grubbing work shall be disposed of by the Contractor as part of the work of this Contract. Material designated by the Engineer to be salvaged shall be stored on the construction site as directed by the Engineer for reuse in this Project or removal by others. B. Burning of any debris resulting from the clearing and grubbing work will not be permitted at the site. 2.05 WARNING AND BARRIER FENCE A. The fence shall be made of a visible, lightweight, flexible, high strength polyethylene material. The fence shall be MIRASAFE as manufactured by Mirafi, Inc., or equal. B. Physical Properties Fence: Color: International Orange Roll Size: 4' x 164' Roll weight: 34 lbs. Mesh opening: 1-1/2" x 3" Posts: ASTM Designation: ASTM 702 Length: 5 feet long (T-Type) Weight: 1.25#/Foot (min) Area of Anchor Plate: 14 Sq. In. C. Drive posts 12 to 18 inches into ground every 10'to 12'. Wrap fence material around first terminal post allowing overlap of one material opening. Use metal tie wire or plastic tie wrap to fasten material to itself at top, middle and bottom. At final post, cut with utility knife or scissors at a point halfway across an opening. Wrap around and tie at final post in the same way as the first post. D. Use tie wire or tie wrap at intermediate posts and splices as well. Thread ties around a vertical member of the fence material and the post, and bind tightly against the post. For the most secure fastening,tie at top, middle and bottom. Overlap splices a minimum of four fence openings, tie as above, fastening both edges of the fence material splice overlap. 32309-006102100:08-03-15 02100-3 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS SECTION 02140 DEWATERING PART 1 -- GENERAL 1.01 WORK INCLUDED A. Furnish all labor, materials,and equipment, perform all work necessary to lower and control the groundwater levels and hydrostatic pressures to permit all excavations and construction to be performed in dry conditions. The work shall include the following: 1. Testing,operation, maintenance,supervision, rewatering,and final dismantling and removal from the site of the dewatering system. 2. The cost of any replacement or rehabilitation of the subgrade or structures damaged due to dewatering system failures or Contractor negligence. 3. Compliance with all regulations relating to this work. 4. The diversion, collection, and removal of all ice, snow and surface runoff from the work areas, and removal of groundwater from new excavations to permit construction in the dry. Nue, 1.02 RELATED WORK SPECIFIED ELSEWHERE A. Requirements of related work are included in Division 1 and Division 2 of these Specifications. 1.03 REFERENCE SPECIFICATIONS CODES AND STANDARDS A. Without limiting the generality of other requirements of these Specifications,all work herein shall conform to or exceed the applicable requirements of the following documents to the extent that the provisions therein are not in conflict with the requirements of this Section. 1. ASTM D1556 Density of soil in place by the Sand Cone Method. 2. ASTM D2167 Density of soil in place by the Rubber Balloon Method. 3. Bureau of Reclamation Groundwater Manual Sediment Test by Imhoff Cone 1.04 SUBMITTALS O A. Submit the following in accordance with Section 01300, Submittals: 1. Name of dewatering subcontractor, if applicable Skewer 32309-006102140:08-03-15 02140-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS b. Daily discharge rates. c. Installation and removal of wells. d. General observations of the system such as equipment running times, and failures. 9. Dewatering well removal records 10. Observation well removal records 1.05 QUALITY ASSURANCE A. The Contractor shall be solely responsible for the arrangement, location,and depths of the dewatering system necessary to accomplish the work described herein. B. Dewatering shall prevent the loss of fines, seepage, boils, quick conditions or softening of the foundation strata while maintaining stability of the sides and bottom of the excavation, and providing dry conditions for construction operations. PART 2 -- PRODUCTS 2.01 MATERIALS A. Materials, especially the well screen, shall be carefully chosen to be compatible with the NA..• environment to prevent erosion, deteriorization, and clogging. B. Surging of the natural formation to form a "gravel pack" is strictly prohibited. PART 3 -- EXECUTION 3.01 EXAMINATION OF THE SITE A. Become familiar with the surface and subsurface site conditions. B. Obtain the data required to analyze the water and soil environment at the site in order to assure that the materials used for the dewatering systems will not erode,deteriorate,clog or otherwise hinder the system's performance during the period of the dewatering. C. Prior to the execution of the work, the Contractor, Owner and Engineer shall jointly survey the condition of adjoining structures. Photographs and records shall be made of any prior settlement or cracking of structures, pavements, and the like,that may become the subject of possible damage claims. 3.02 DESIGN A. The dewatering system shall be capable of relieving all hydrostatic pressure against the height of the excavation walls and of lowering the hydrostatic level below the bottom of the 32309-006102140:08-03-15 02140-3 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS A. All tests and inspections require the witnessing and written approval of the Owner and Engineer. B. Provide safe access for the owner and Engineer to perform testing and inspection. C. The Owner and Engineer will provide oral and written notice to the Contractor for all tests and inspections that do not meet approval. 3.04 INSTALLATION AND TESTING A. Install the dewatering system from the existing ground surface or from the bottom of an excavation which is located above the natural groundwater level. B. Pump each well individually at its maximum or design flow and take a water sample using the following procedures: 1. Obtain samples from stopcocks located along the discharge lines at points of high turbulence or between 4 and 8 o'clock on the perimeter of straight sections of pipe. 2. Flush the stopcock for a few seconds before taking a sample. 3. Take a 1 liter sample with the stopcock fully open. C. Test the sample following the Sediment Test by Imhoff Cone for two to three minutes and measure the volume of settled materials to the nearest 0.01 milliliters (0.01 milliliters = 10 ppm). D. All wells shall be evaluated as follows: 1. Wells producing 10 ppm or less shall be accepted. 2. Wells producing between 10 and 20 ppm may be accepted by the Engineer based on the evaluation of average ppm for all wells, ppm of adjacent wells, and total quantity of water which is actually pumped to dewater the excavation. 3. Well producing more than 20 ppm shall be abandoned and backfilled. E. Observation wells shall consist of a standpipe or riser of minimum 1.0-inch inside diameter and a minimum three (3) foot long well-point screen or slotted PVC section at the bottom. Observation wells shall be installed as follows: 1. Employ the jetting method for all observation wells except those within ten feet of existing structures, piping or utilities. 2. Employ Case Boring Techniques for all observation wells within ten feet of existing structures, piping, or utilities and backfill the annulus between the well point or riser and the natural soil with a free flowing granular material similar to Ottawa Sand. F. Test observation wells by adding or removing water from the riser to demonstrate their proper functioning. 32309-006102140:08-03-15 02140-5 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS F. Remove and add riser pipe of each observation well located within the excavation as construction progresses until the well conflicts with the structure. When the conflict occurs, abandon the observation well, fill it with grout, and cut the riser off at grade. G. In the event of a dewatering system failure, take the following steps: 1. Conduct in situ density tests conforming to ASTM D1556 or ASTM D2167 immediately above and at the structure founding grades. 2. Remove all soils that show unacceptable density and replace them with compacted fill as indicated in Section 02200, Earthwork. 3. Test the repaired soils as required by the Owner and Engineer to verify that they have been returned to their original in situ state or better. 4. Repair or replace damaged structures. 3.07 REWATERING AND REMOVAL OF DEWATERING SYSTEM A. Obtain written approval from the Owner and Engineer to being rewatering operations. B. Provide an adequate weight of fill to prevent buoyancy. C. Pump water into the excavation such that the water level inside the excavation is always at a higher level than the rising groundwater on the outside until the groundwater level has reached its static level. D. Remove all dewatering wells, buried and surface piping, cables, pump foundations, structural supports and all other support facilities. E. Backfill as specified in Section 02200, Earthwork, all trenches and excavations below final grades or in fill areas. F. Provide documentation of dewatering and observation well removal including the date of removal, well number, location, procedures, and materials used. - END OF SECTION - 32309-006102140:08-03-15 02140-7 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS Now SECTION 02200 EARTHWORK PART 1 -- GENERAL 1.01 THE REQUIREMENT A. Furnish all labor, equipment and materials required to complete all work associated with excavation, including off-site borrow excavation, backfill, drainage layers beneath and around structures, foundation and backfill stone, filter fabric, embankments, stockpiling topsoil and any excess suitable material in designated areas, in place compaction of embankments, backfill and subgrades beneath foundations and roadways, excavation support, disposing from the site all unsuitable materials, providing erosion and sedimentation control grading, site grading and preparation of pavement and structure subgrade,and other related and incidental work as required to complete the work shown on the Drawings and specified herein. B. All excavations shall be in conformity with the lines, grades, and cross sections shown on the Drawings or established by the Engineer. C. It is the intent of this Specification that the Contractor conduct the construction activities in such a manner that erosion of disturbed areas and off-site sedimentation be absolutely minimized. D. All work under this Contract shall be done in conformance with and subject to the limitations of the latest editions of the Virginia Department of Transportation Road and Bridge Specifications and the Virginia Erosion and Sediment Control Handbook. 1.02 RELATED WORK SPECIFIED ELSEWHERE A. Requirements of related work are included in Division 1 and Division 2 of these Specifications. 1.03 REFERENCE SPECIFICATIONS, CODES, AND STANDARDS A. Without limiting the generality of the other requirements of the Specifications,all work herein shall conform to the applicable requirements of the following documents. All referenced Specifications, codes, and standards refer to the most current issue available at the time of Bid. 1. Virginia Department of Transportation Road and Bridge Specifications. O 2. American Society for Testing and Materials (ASTM): ASTM C 127 Test for Specific Gravity and Absorption of Coarse Aggregate. ASTM C 136 Test for Sieve Analysis of Fine and Coarse Aggregates. 32309-006102200:08-03-15 02200-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS 'ow" 3. List of disposal sites for waste and unsuitable materials and all required permits for use of those sites. 4. Plans and cross sections of open cut excavations showing side slopes and limits of the excavation at grade. 5. Samples of synthetic filter fabric and reinforced plastic membrane with manufacturer's certificates or catalog cuts stating the mechanical and physical properties. Samples shall be at least one (1)foot wide and four(4)feet long taken across the roll with the warp direction appropriately marked. 6. Construction drawings and structural calculations for any types of excavation support systems required. Drawings and calculations shall be sealed by a currently registered Professional Engineer in the Commonwealth of Virginia. 7. Monitoring plan and pre-construction condition inspection and documentation of all adjacent structures, utilities, and roadways near proposed installation of excavation support systems. 1.06 PRODUCT HANDLING A. Soil and rock material shall be excavated, transported, placed, and stored in a manner so as to prevent contamination, segregation and excessive wetting. Materials which have become contaminated or segregated will not be permitted in the performance of the work and shall be removed from the site. 1.07 USE OF EXPLOSIVES A. When the use of explosives is necessary for the prosecution of the work, the Contractor shall exercise the utmost care not to endanger life or property. The Contractor shall be responsible for any and all damage or injury to persons or property resulting from the use of explosives. Use of explosives shall be in accordance with Specification Section 02202, Excavation By Blasting. PART 2 -- PRODUCTS 2.01 SELECT FILL A. Soils from the excavations meeting requirements stipulated herein with the exceptions of topsoil and organic material may be used as select fill for backfilling, constructing embankments, reconstructing existing embankments, and as structural subgrade support. B. Select fill used for embankment construction shall be a silty or clayey soil material with a Maximum Liquid Limit (LL)of 50 and a Plasticity Index (PI) between 7 and 20. C. Select fill used for backfilling shall either be material as described in Paragraph B above or a granular soil material with a Maximum Plasticity Index (PI) of 6. 32309-006102200:08-03-15 02200-3 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS *to '' B. Where blasting is necessary to perform the required excavations, blasting shall be performed as stipulated in Section 02202, Excavation By Blasting. C. All suitable material removed in the excavation shall be used as far as practicable in the formation of embankments,subgrades,and shoulders,and at such other places as may be indicated on the Drawings or indicated by the Engineer. No excavation shall be wasted except as may be permitted by the Engineer. Refer to the drawings for specific location and placement of suitable excavated materials in the formation of embankments, backfill, and structural and roadway foundations. THE ENGINEER WILL DESIGNATE MATERIALS THAT ARE UNSUITABLE. The Contractor shall furnish off site disposal areas for the unsuitable material. Where suitable materials containing excessive moisture are encountered above grade in cuts, the Contractor shall construct above grade ditch drains prior to the excavation of the cut material when in the opinion of the Engineer such measures are necessary to provide proper construction. D. All excavations shall be made in the dry and in such a manner and to such widths as will give ample room for properly constructing and inspecting the structures and/or piping they are to contain and for such excavation support, pumping and drainage as may be required. Excavation shall be made in accordance with the grades and details shown on the Drawings and as specified herein. E. Excavation slopes shall be flat enough to avoid slides that will cause disturbance of the subgrade or damage of adjacent areas. Excavation requirements and slopes shall be as indicated in the Drawings. The Contractor shall intercept and collect surface runoff both at the top and bottom of cut slopes. The intersection of slopes with natural ground surfaces, `%Noy including the beginning and ending of cut slopes, shall be uniformly rounded as shown on the Drawings or as may be indicated by the Engineer. Concurrent with the excavation of cuts the Contractor shall construct intercepting berm ditches or earth berms along and on top of the cut slopes at locations shown on the Drawings or designated by the Engineer. All slopes shall be finished to reasonably uniform surfaces acceptable for seeding and mulching operations. No rock or boulders shall be left in place which protrude more than 1 foot within the typical section cut slope lines,and all rock cuts shall be cleaned of loose and overhanging material. All protruding roots and other objectionable vegetation shall be removed from slopes. The Contractor shall be required to submit plans of open-cut excavation for review by the Engineer before approval is given to proceed. F. It is the intent of these Specifications that all structures shall bear on an aggregate base unless shown otherwise on the Contract Drawings, crushed stone or screened gravel bedding placed to the thickness shown on the Drawings, specified in these Specifications, or not less than 6-inches. Bedding for process piping shall be as specified in Section 15000 - Basic Mechanical Requirements, or as shown on the Drawings. G. The bottom of all excavations for structures and pipes shall be examined by the Engineer for bearing value and the presence of unsuitable material. If, in the opinion of the Engineer, additional excavation is required due to the low bearing value of the subgrade material,or if the in-place soils are soft, yielding, pumping and wet, the Contractor shall remove such material to the required width and depth and replace it with thoroughly compacted select fill, and/or crushed stone or screened gravel as indicated by the Engineer. Payment for such additional work ordered by the Engineer shall be made as an extra by a Change Order in 32309-006102200:08-03-15 02200-5 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS E. All excavation supports shall be removed upon completion of the work except as indicated herein. The Engineer may permit supports to be left in place at the request and expense of the Contractor. The Engineer may order certain supports left permanently in place in addition to that required by the Contract. The cost of the materials so ordered left in place, less a reasonable amount for the eliminated expense of the removal work omitted, will be paid as an extra by a Change Order in accordance with the General Conditions and Division 1. Any excavation supports left in place shall be cut off at least two (2) feet below the finished ground surface or as directed by the Engineer. 3.04 PROTECTION OF SUBGRADE A. To minimize the disturbance of bearing materials and provide a firm foundation, the Contractor shall comply with the following requirements: 1. Use of heavy rubber-tired construction equipment shall not be permitted on the final subgrade unless it can be demonstrated that drawdown of groundwater throughout the entire area of the structure is at least 3 feet below the bottom of the excavation (subgrade). Even then, the use of such equipment shall be prohibited should subgrade disturbance result from concentrated wheel loads. 2. Subgrade soils disturbed through the operations of the Contractor shall be excavated and replaced with compacted select fill or crushed stone at the Contractor's expense as indicated by the Engineer. 3. The Contractor shall provide positive protection against penetration of frost into Nemo, materials below the bearing level during work in winter months. This protection can consist of a temporary blanket of straw or salt hay covered with a plastic membrane or other acceptable means. 3.05 PROOFROLLING A. The subgrade of all structures and all areas that will support pavements or select fill shall be proofrolled. After stripping of topsoil,excavation to subgrade and prior to placement of fills, the exposed subgrade shall be carefully inspected by probing and testing as needed. Any topsoil or other organic material still in place, frozen, wet, soft, or loose soil, and other undesirable materials shall be removed. The exposed subgrade shall be proofrolled with a heavily loaded tandem-wheeled dump truck to check for pockets of soft material hidden beneath a thin crust of better soil. Any unsuitable materials thus exposed shall be removed and replaced with an approved compacted material. 3.06 EMBANKMENTS A. The Contractor shall perform the construction of embankments in such a manner that cut and fill slopes will be completed to final slopes and grade in a continuous operation. The operation of removing excavation material from any cut and the placement of embankment in any fill shall be a continuous operation to completion unless otherwise permitted by the Engineer. B. Surfaces upon which embankments are to be constructed shall be stripped of topsoil, organic material, rubbish and other extraneous materials. After stripping and prior to 32309-006102200:08-03-15 02200-7 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS '`" horizontal layers not exceeding 8-inches in compacted depth for the full width. Stones or fragmentary rock larger than 4-inches in their greatest dimension will not be allowed within the top 6-inches of the ground nor within 6 inches of pipes. No stone or fragmentary rock larger than 12-inches in their greatest dimension will be allowed for any portion of backfill. Compaction shall be in accordance with the requirements of Paragraph 3.09, COMPACTION. B. Where excavation support is used, the Contractor shall take all reasonable measures to prevent loss of support beneath and adjacent to pipes and existing structures when supports are removed. If significant volumes of soil cannot be prevented from clinging to the extracted supports, the voids shall be continuously backfilled as rapidly as possible. The Contractor shall thereafter limit the depth below subgrade that supports will be installed in similar soil conditions or employ other appropriate means to prevent loss of support. 3.08 COMPACTION A. The Contractor shall compact embankments, backfill, crushed stone,aggregate base, and in place subgrade in accordance with the requirements of this Section. The densities specified herein refer to percentages of maximum density as determined by the noted test methods. Compaction of materials on the project shall be in accordance with the following schedule: Density % Density % Max. Lift Thickness Std. Proctor Mod. Proctor as Compacted (D698) (D1557) Inches ``'..'' Embankments Beneath Structures* 98 95 8 Other Embankments 95 92 8 Backfill Around Structures 95 92 8 Backfill in Pipe Trenches 95 92 8 Crushed Stone Beneath Structures ** ** 12 Select Sand -- 98 8 Aggregate Base Course (ABC) -- 98 8 Beneath Pavements and Structures Crushed Stone Backfill ** ** 12 Crushed Stone Pipe Bedding ** ** 12 In place Subgrade Beneath Structures 98 95 Top 12-inches * Embankments beneath structures shall be considered to include a zone 10 feet out from the foundation of the structure extending down to the natural ground on a 45° slope. ** The aggregate shall be compacted to a degree acceptable to the Engineer by use of a vibratory compactor and/or crawler tractor. 32309-006102200:08-03-15 02200-9 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS '`"` has been used for backfill and incorporated into the embankments. B. Coordination with Seeding Operations The Contractor shall coordinate the work covered by this section with the construction of embankments so that the requirements of Section 02200 are met. C. Materials All material shall meet the requirements of Division 2 shown below: Borrow Material Section 02200, Subsection 2.01 - Select Fill D. Construction Methods 1. General The surface of the borrow area shall be thoroughly cleared and grubbed and cleaned of all unsuitable material including all organics, topsoil, etc., before beginning the excavation. Disposal of material resulting from clearing and grubbing shall be in accordance with Section 02100. Each borrow operation shall not be allowed to accumulate exposed, erodible slope area in excess of 1 acre at any one given time without the Contractor's beginning permanent seeding and mulching of the borrow source or other erosion control measures as may be approved by the Engineer. The topsoil shall be removed and stockpiled at locations that will not interfere with the borrow operations and that meet the approval of the Engineer. Temporary erosion control measures shall be installed as may be necessary to prevent the erosion of the stockpile material. Once all borrow has been removed from the source or portion thereof, the stockpiled topsoil shall be spread uniformly over the source. Where it is necessary to haul borrow material over existing roads, the Contractor shall use all necessary precautions to prevent damage to the existing roads. The Contractor shall also conduct his hauling operations in such a manner as to not interfere with the normal flow of traffic and shall keep the traffic lanes free from spillage at all times. 2. Owner Furnished Sources Where borrow sources are furnished by the Owner the location of such sources will be as designated on the Drawings or as directed by the Engineer. The Owner will furnish the necessary haul road right-of-way at locations designated by the Engineer. All haul roads required shall be built, maintained, and when directed by the Engineer, obliterated,at no cost to the Owner. Where the haul road is to be reclaimed for cultivation the Contractor shall plow or scarify the area to a minimum depth of 8 inches. The borrow sources shall be left in a neat and presentable condition after use. All ir.. 32309-006102200:08-03-15 02200-11 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS contours which are comparable to and blend in with the adjacent topography, but in no case will slopes steeper than 3:1 be permitted. 3) Erosion Control The plan shall address the temporary and permanent measures that the Contractor intends to employ during use of the source and as a part of the reclamation. The Contractor's plan shall provide for the use of staged permanent seeding and mulching on a continual basis while the source is in use and the immediate total reclamation of the source when no longer needed. 4. Maintenance During construction and until final acceptance the Contractor shall use any methods approved by the Engineer which are necessary to maintain the work covered by this section so that the work will not contribute to excessive soil erosion. - END OF SECTION - �rw 32309-006102200:08-03-15 02200-13 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS N"` SECTION 02207 AGGREGATE MATERIALS PART 1 -- GENERAL 1.01 THE REQUIREMENT A. The Contractor shall furnish all labor,equipment and materials required to complete all work associated with the installation of aggregate material beneath foundations, as backfill and as roadway subgrades and other related and incidental work as required to complete the work shown on the Drawings and specified herein. 1.02 RELATED WORK SPECIFIED ELSEWHERE A. Section 01090 - Reference Standards B. Section 02200 - Earthwork C. Section 02276 - Erosion and Sedimentation Control D. Section 02510 - Paving and Surfacing `"" E. Section 02712 - Foundation Drainage Systems F. Section 02910 - Final Grading and Landscaping 1.03 REFERENCE SPECIFICATIONS, CODES AND STANDARDS A. Without limiting the generality of the other requirements of the Specifications,all work herein shall conform to the applicable requirements of the following documents. All referenced specifications, codes, and standards refer to the most current issue available at the time of Bid. 1. Virginia Department of Transportation (VDOT), Road and Bridge Specifications. 2. ASTM C 127 Test for Specific Gravity and Absorption of Coarse Aggregate. 3. ASTM C 136 Test for Sieve Analysis of Fine and Coarse Aggregates. 4. ASTM C 535 Test for Resistance to Degradation of Large Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine. 1.04 SUBMITTALS A. Submit the following in accordance with Section 01300, Submittals. 1. Materials gradation and certification. 32309-006102207:08-03-15 02207-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS %%" SECTION 02274 GEOTEXTILES PART 1 -- GENERAL 1.01 THE REQUIREMENT A. The Contractor shall furnish and install all Geotextiles, including all necessary and incidental items, as detailed or required for the Contractor to complete the installation in accordance with the Drawings and these Specifications. B. For the location of each type of Geotextile see the Drawings. 1.02 SUBMITTALS A. Prior to shipping to the site,the Contractor shall submit to the Engineer two copies of a mill certificate or affidavit signed by a legally authorized official of the Manufacturer for each type of Geotextile. The Supplier shall also submit three Geotextile samples of each product, 1 yard square each, seamed and unseamed as appropriate, with the mill certificate for each Geotextile type supplied. The mill certificate or affidavit shall attest that the Geotextile meets the chemical, physical and manufacturing requirements stated in the specifications. The samples shall be labeled with the manufacturer's lot number, machine direction,date of sampling, project number, specifications, manufacturer and product name. B. The Engineer shall be furnished copies of the delivery tickets or other acceptable receipts as evidence for materials received that will be incorporated into construction. PART 2 -- MATERIALS 2.01 MATERIALS A. Filter Geotextile shall be a minimum 6-ounce per square yard nonwoven needle punched synthetic fabric consisting of staple or continuous filament polyester or polypropylene manufactured in a manner accepted by the Engineer and the Owner. The Geotextiles shall be inert and unaffected by long-term exposure to chemicals or liquids with a pH range from 3 to 10. The Geotextiles shall have a minimum threshold water head of 0.25-inches in the "as received" condition. B. Cushion Geotextile shall be a minimum 16-ounce per square yard nonwoven needle punched synthetic fabric consisting of continuous filament or staple polyester or polypropylene manufactured in a manner accepted by the Engineer and the Owner. The Geotextiles shall be inert and unaffected by long-term exposure to chemicals or liquids with o a pH range from 3 to 10. Niago- 32309-006102274:08-03-15 02274-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS 3. Grab Tensile Strength (ASTM D4632) 4. Burst Strength (ASTM D3786) 5. Puncture Resistance (ASTM D4833) D. The Engineer may add to, remove or revise the test methods used for determination of conformance properties to allow for use of improved methods. E. All Geotextile conformance test data shall meet or exceed requirements outlined in Table 1 of these Specifications for the particular category of Geotextile prior to installation. Any materials that do not conform to these requirements shall be retested or rejected at the direction of the Engineer. F. Each roll of Geotextile will be visually inspected by the Engineer or his representative. The Engineer reserves the right to sample and test at any time and reject, if necessary, any material based on visual inspection or verification tests. G. A Geotextile that is rejected shall be removed from the project site and replaced at the Contractor's expense. Sampling and conformance testing of the Geotextile supplied as replacement for rejected material shall be performed by the Engineer at Contractor's expense. 3.03 INSTALLATION A. Geotextiles shall be placed to the lines and grades shown on the Drawings. At the time of installation, the Geotextile shall be rejected by the Engineer if it has defects, rips, holes, flaws, evidence of deterioration, or other damage. B. The Geotextiles shall be placed smooth and free of excessive wrinkles. C. When the Geotextiles are placed on slopes,the upslope fabric portion shall be lapped such that it is the upper or exposed Geotextile. D. Geotextiles shall be temporarily secured in a manner accepted by the Engineer prior to placement of overlying materials. E. In the absence of specific requirements shown on the Drawings,the following shall be used for overlaps of adjacent rolls of Geotextile: OVERLAP OF ADJACENT GEOTEXTILE TYPE/ ROLLS(') TRANSVERSE END APPLICATION (INCHES) OVERLAP (INCHES) Filter Geotextile 6 min 12 min Cushion Geotextile 12 min 12 min Separator-Roadway 12 min 24 min Applications Separator-Slope Protection 18 min 24 min Now 32309-006102274:08-03-15 02274-3 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS 0w Z . . ± m g � CZ I- CC x « < « < < ± 2 ? / Z Z 2 z Z < 2 / w � j SECTION 02276 EROSION AND SEDIMENTATION CONTROL PART 1 -- GENERAL 1.01 THE REQUIREMENTS A. The Contractor shall employ a Responsible Land Disturber certified in the Commonwealth of Virginia who is responsible for implementing Best Management Practices (BMP's) to prevent and minimize erosion and resultant sedimentation in all cleared and grubbed areas during and after construction. This item covers the Work necessary for the installation of structure and measures for the prevention and control of soil erosion. The Contractor shall furnish all material, labor and equipment necessary for the proper installation, maintenance, inspection, monitoring, reporting,and removal,(where applicable)of erosion prevention and control measures and to cause compliance with the General Virginia Pollutant Discharge Elimination System (VPDES) Permit Regulation for Discharges of Storm Water From Construction Activities (9 VAC 25-180)and VPDES General Permit No. VAR10 under this Section. B. All excavations shall be in conformity with the lines, grades, and cross sections shown on the Drawings or established by the Engineer. C. It is the intent of this Specification that the Contractor conduct the construction activities in such a manner that erosion of disturbed areas and off site sedimentation be absolutely minimized. D. All Work under this Contract shall be done in conformance with and subject to the limitations of the Virginia Erosion and Sediment Control Handbook(VESCH)and the Virginia Erosion and Sediment Control Law, Regulations and Certification Regulations, as adopted in the Code of Virginia Title 10-1,Chapter 5,Article 4 and Sections 4VAC30-50 and 4VAC50-50 of the Virginia Administration Code. E. The Contractor shall comply with all applicable minimum standards set in the Virginia Erosion and Sediment Control Handbook. The following excerpts from the VESCH Minimum Standards are particularly important: 1. Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site. Temporary soil stabilization shall be applied within seven days to denuded areas that may not be at final grade but will remain dormant (undisturbed) for longer than 30 days. Permanent stabilization shall be applied to areas that are to be left dormant for more than one year. 2. A permanent vegetative cover shall be established on denuded areas not otherwise permanently stabilized. Permanent vegetation shall not be considered established until a ground cover is achieved that, in the opinion of the local program administrator or his designated agent, is uniform, mature enough to survive and will inhibit erosion. 32309-006102276:08-03-15 02276-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS 1.04 REGULATORY COMPLIANCE Nifty. A. Land disturbance activities are not authorized to begin until after all required erosion and sediment control permits are obtained from the United States, Commonwealth of Virginia, and Albemarle County. Contractor is the Co-Primary Permittee and Operator under the provisions of the VPDES Permit. As such, Contractor will be required to sign certain certifications as described in the VPDES Permit. Contractor shall comply with requirements specified in the Contract Documents or by the Engineer. Contractor shall also comply with all other laws, rules, regulations,ordinances and requirements concerning soil erosion and sediment control established in the United States, the Commonwealth of Virginia and Albemarle County. The following documents and the documents referenced therein define the regulatory requirements for this Section 02276. 1. VPDES PERMIT: The Virginia Pollution Discharge Elimination System (VPDES) General Permit(VAR 10)for Discharges of Storm Water from Construction Activity governs land disturbance or construction activities of one (1) acre or more. On applicable sites,Contractor is responsible for complying with terms and conditions of this permit. 2. Manual for Erosion and Sediment Control: Contractor shall follow Practices and Standards of the Virginia Erosion and Sediment Control Handbook(VESCH),Third Edition, or latest. 3. SWP3: When a Storm Water Pollution Prevention Plan (SWP3) is provided in the Contract Documents, the Contractor shall follow the practices described in the SWP3. (See the Appendix for the SWP3, if applicable.) 4. Contractor shall designate a Responsible Land Disturber,approved by the Virginia Department of Conservation and Recreation (DCR) Erosion and Sediment Control (ESC) Program, to oversee all erosion and sediment control operations on the construction site. 5. Albemarle County: The Contractor shall follow the provisions of Albemarle County Code, Chapter 17, Water Protection; Article II, Erosion and Sediment Control, secure an erosion and sedimentation bond for an amount approved by the County, and prepare an application for and obtain a Erosion and Sediment Control Permit as required by Albemarle County. 1.05 SUBMITTALS A. Prior to the start of the Work,the Contractor shall prepare and submit a plan for applying the temporary and permanent erosion and siltation control measures as shown on the Owner's approved Erosion and Sediment Control Plan. Construction Work shall not commence until the schedule of Work and the methods of operations have been reviewed and approved. B. In accordance with the procedures and requirements set forth in the General Conditions Division 1 and Section 01300, the Contractor shall submit the following: 1. Name and location of all material suppliers. 32309-006102276:08-03-15 02276-3 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS 7. Culvert Inlet Protection shall be constructed at the locations shown on the Drawings, Nika` and at other locations indicated by the Engineer. Culvert Inlet Protection shall be designed, installed and maintained in accordance with the requirements of Section 3.08 of the VESCH. 8. Temporary and Permanent Stormwater Conveyance Channels shall be installed at the locations shown on the Drawings, and at other locations indicated by the Engineer. Channels and Channel Linings shall be designed, installed and maintained in accordance with the requirements of Sections 3.17 and 3.36 of the VESCH. 9. Riprap Outlet Protection shall be constructed at the locations shown on the Drawings and at other locations indicated by the Engineer. All Riprap Outlet Protection shall be designed, installed and maintained in accordance with the requirements of Sections 3.18 and 3.19 of the VESCH. 10. Temporary Construction Entrances shall be located at points where vehicles enter and leave a construction site and at other locations indicated by the Engineer. Temporary Construction Entrances shall be designed, installed and maintained in accordance with the requirements of Section 3.02 of the VESCH. 1.07 GUARANTEE A. All restoration and revegetation Work shall be subject to the one-year guarantee period of the Contract as specified in the General Conditions. Nowie PART 2 -- MATERIALS 2.01 MATERIALS A. Materials for use in erosion and sedimentation control devices shall be in accordance with the Virginia Erosion and Sediment Control Handbook. 2.02 TEMPORARY SEDIMENT TRAPS A. Temporary Sediment Traps shall be constructed as shown on the Contract Drawings and as specified herein. The Temporary Sediment Traps shall be constructed and maintained in accordance with Part 3 of this Section,and Section 3.13 of the VESCH,to the satisfaction of the Engineer and/or local program administrator until a vegetative ground cover has been established. The cost of the Temporary Sediment Traps shall include the excavation, grading, diversion ditches, stone for erosion control, washed stone, geotextile, etc. and all maintenance activities required. 2.03 TEMPORARY DIVERSIONS A. Temporary Diversions shall be constructed as shown on the Contract Drawings and as specified herein. Temporary Diversions shall be installed and maintained in accordance with Part 3 of this Section, and Section 3.12 of the VESCH, to the satisfaction of the Engineer and/or local program administrator until the site has been stabilized. The cost of 32309-006102276:08-03-15 02276-5 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS ,� Width: 32" Number of Line Wires: 8 Stay Wire Spacing: 12" Line and Stay Wires: 12.5 Ga. Top and Bottom Wires: 10 Ga. Wire Coating: ASTM Class 1 Zinc Coating 2.05 RIP RAP A. The Contractor shall place rip rap as shown on the Drawings and as specified in Section 414 of the VDOT Road and Bridge Specifications. The stone for rip rap shall consist of field stone or rough unhewn quarry stone. The stone shall be sound, durable, and free from seams, cracks, or other structural defects. The rip rap shall be as specified on the Drawings. 2.06 CULVERT INLET PROTECTION A. Culvert Inlet Protection shall be constructed as shown on the Drawings and as specified herein. The culvert inlet protection shall be constructed at the upstream end of all culverts as indicated and maintained in accordance with Part 3 of this Section, and Section 3.08 of the VESCH,to the satisfaction of the Engineer until the site has been stabilized. The cost of the culvert inlet protection shall include the excavation, grading, stone for erosion control, riprap, etc. and all maintenance activities required. 2.07 STRAW WITH NET TEMPORARY SOIL STABILIZATION BLANKET (SSB) i"`""" A. The Contractor shall place straw with net temporary channel and slope SSB as shown on the Drawings. The blanket shall consist of clean wheat straw from agricultural crops made into a knitted straw blanket that is machine assembled. The straw shall be evenly distributed throughout the blanket. The blanket shall be covered with a photodegradable synthetic mesh attached to the straw with degradable thread. B. The Contractor shall place the straw with net temporary channel and slope SSB where directed immediately after the channel or slope has been properly graded and prepared, fertilized, and seeded. The netting shall be on top with the straw in contact with the soil. C. The Contractor will immediately repair or replaced section of straw with net temporary channel and slope SSB which is not functioning properly or has been damaged in any way until a stable growth of grass has been established. D. Straw with net SSB shall be North American Green S150 matting,American Excelsior Co., Curlex I, Contech SFB1, or equal with a minimum shear stress value of 1.50 lb./ft.2 2.08 CURLED WOOD OR COCONUT FIBER TEMPORARY SOIL STABILIZATION BLANKET (SSB) A. The Contractor shall place curled wood or coconut fiber channel and slope SSB in channels or on slopes as shown on the Drawings. The blanket shall consist of machine-produced mat of curled wood excelsior or coconut fiber with consistent thickness and the fibers evenly distributed over the entire area of the blanket. The top of the blanket shall be covered with 32309-006102276:08-03-15 02276-7 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS germination inhibiting factors. The agent shall be used for hydroseeding grass seed in j`" combination with other approved amendments resulting in a highly viscous slurry which, when sprayed directly on the soil, forms a gelatinous crust. PART 3 -- EXECUTION 3.01 INSTALLATION AND MAINTENANCE A. Erosion and sedimentation control devices shall be established prior to the clearing operations in a given area. Where such practice is not feasible, the erosion and sedimentation control device(s)shall be established immediately following completion of the clearing operation. B. The Contractor shall furnish the labor, materials and equipment required for routine maintenance of all erosion and sedimentation control devices. Maintenance shall be scheduled as required for a particular device to maintain the removal efficiency and intent of the device. Maintenance shall include but not be limited to 1)the removal and satisfactory disposal of trapped sediments from traps or silt barriers and 2) replacement of filter fabrics used for silt fences. Sediment removed from erosion and sedimentation control devices shall be disposed of in locations that will not result in off site sedimentation as acceptable to the Engineer, at no additional cost to the Owner. C. The Contractor shall provide temporary sedimentation traps at all locations shown on the Contract Drawings and for the settling of water pumped from the excavations or intercepted by drainage ditches for keeping water out of the excavations or to protect existing ''+...e structures.The Contractor shall seed and mulch the earthen embankment with temporary or permanent vegetation immediately after installation. The Contractor shall remove trapped sediment from the basins when the design capacity has been reduced by 25%to maintain their effectiveness or as indicated by the Engineer. Sediment material removed from the basins shall be disposed by the Contractor in locations that will not result in off-site sedimentation as acceptable to the Engineer, at no additional cost to the Owner. 1. Inspect temporary sediment traps at least once every 14 days and within 48 hours after each runoff producing rainfall event. Remove sediment and restore the trap to its original dimensions when the sediment has accumulated to one-forth the design volume of the trap. Place the sediment that is removed in a designated disposal area and replace the contaminated part of the aggregate facing. 2. Check the structure for damage from erosion or piping. Periodically check the depth of the spillway to ensure it is a minimum of 1.0 ft. below the low point of the embankment. Immediately fill settlement of the embankment to slightly above design grade. Riprap displaced from the spillway must be replaced immediately. 3. After all sediment-producing areas have been permanently stabilized and permission has been obtained from the plan approving authority, remove the structure and all unstable sediment. Smooth the area to blend with the adjoining areas and stabilize properly. 32309-006102276:08-03-15 02276-9 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS the design depth. Place the sediment that is removed in a designated disposal area A4"' and replace the contaminated part of the gravel facing. 2. Check the structure for damage from erosion or piping. Stone or riprap displaced from the berm must be replaced immediately. 3. After all sediment-producing areas have been permanently stabilized and permission has been obtained from the plan approving authority, remove the structure and all unstable sediment. Smooth the area to blend with the adjoining areas and stabilize properly. I. Engineer may direct the Contractor to place Straw with Net, Curled Wood or Coconut Fiber SSB's and Synthetic SSM's in permanent channels or on slopes at other locations not shown on Drawings. 1. All temporary and permanent channel linings shall be unrolled in the ditch in the direction of the flow of water. Temporary and permanent linings shall be installed in accordance with the requirements of Section 3.36 of the VESCH and per manufacturer's specifications. 2. During the establishment period,check grass,SSB and SSM-lined channels at least once every 14 days and within 48 hours after each runoff producing rainfall event. For grass-lined channel once grass is established,check periodically and after every runoff producing rainfall event. Immediately make repairs. It is particularly important to check the channel outlet and all road crossings for bank stability and evidence of piping and scour holes. Give special attention to the outlet and inlet Nom, sections and other points where concentrated flow enters. Remove all significant sediment accumulations to maintain the designed carrying capacity. Keep the grass in a healthy, vigorous condition at all times. J. The Contractor shall provide temporary slope drains at all location noted on the Contract Drawings, and at other locations as may be directed by the Engineer. 1. Inspect the temporary slope drain and supporting diversion at least once every 14 days and after every runoff producing rainfall event and promptly make necessary repairs. When the protected area has been permanently stabilized, temporary measures may be removed, materials disposed of properly,and all disturbed areas stabilized appropriately. K. The Contractor shall provide temporary construction entrances at all locations noted on the Contract Drawings, and at all other locations as may be directed by the Engineer. 1. Maintain the gravel pad in a condition to prevent mud or sediment from leaving the construction site. This may require periodic topdressing with VDOT #1 course aggregate. Inspect each construction entrance at least once every 14 days and within 48 hours after each runoff producing rainfall event and clean out as necessary. Immediately remove all objectionable materials spilled, washed, or tracked onto public roadways. 2. Contractor shall provide wash rack and wash water for temporary construction entrances. The roadway under the temporary construction entrance shall be graded 32309-006102276:08-03-15 02276-11 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS 5. The Contractor agrees to hold the Owner or any of its agents harmless from any and all liability, loss or damage that may arise out of a violation to the Erosion and Sediment Control Ordinance. 6. The Contractor shall monitor and take precautions to control dust, including, but not limited to, use of water or chemical dust palliative, limiting the number of vehicles allowed on site, minimizing the operating speed of all vehicles. 3.02 INSPECTIONS AND MAINTENANCE A. The Contractor shall be responsible for the implementation of the Maintenance and Inspection Procedures as written by the Engineer. The implementation must comply with guidelines as set forth in General Virginia Pollutant Discharge Elimination System Permit Regulation for Discharges of Storm Water From Construction Activities(9 VAC 25-180)and VPDES General Permit No. VAR10. B. The Contractor shall designate a Qualified Person to perform inspections required by this Section 02276. The following areas below are to be inspected and maintenance performed, if needed, at least once every 14 calendar days and within 48 hours of the end of runoff producing storm event. 1. Disturbed areas of the construction site that have not undergone final stabilization 2. Erosion and sediment control structures 3. All locations where vehicles enter or exit the site 4. Material storage and construction laydown areas that are exposed to precipitation and have not been finally stabilized C. When a Storm Water Pollution Prevention Plan (SWP3) is provided in the Contract Documents, the Qualified Person shall follow the practices inspection and maintenance requirements described in the SWP3. (See the Appendix for the SWP3, if applicable). All appropriate records required by the SWP3 shall be maintained on site. D. Immediate action will be taken to correct deficiencies to BMP's. The State reserves the right to stop all construction activities not related to maintaining BMP's until such deficiencies are repaired. E. In areas that have been finally stabilized, inspections and, if necessary, maintenance by Contractor will occur at least once per month for the duration of the contract or project, whichever is longer. F. During inspections the following will be observed and appropriate maintenance procedures taken: 1. The conformance to specifications and current condition of all erosion and sediment control structures. 2. The effectiveness and operational success of all erosion and sediment control measures. 32309-006102276:08-03-15 02276-13 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS SECTION 02500 SURFACE RESTORATION PART 1 -- GENERAL 1.01 THE REQUIREMENT A. Provide all labor, equipment, and materials necessary for final grading, topsoil placement, and miscellaneous site work not included under other Sections but required to complete the work as shown on the Drawings and specified herein. 1.02 RELATED WORK SPECIFIED ELSEWHERE A. Section 02200 - Earthwork B. Section 02276 - Erosion and Sedimentation Control C. Section 02910 - Final Grading and Landscaping PART 2 -- MATERIALS *kw- 2.01 TOPSOIL A. Topsoil shall meet the requirements of Section 02200 — Earthwork. PART 3 -- EXECUTION 3.01 FINAL GRADING A. Following approval of rough grading the subgrade shall be prepared as follows: 1. For riprap, bare soil 24 inches below finish grade or as directed by Engineer. 2. For topsoil, scarify 2-inches deep at 4 inches below finish grade. 3.02 TOPSOIL PLACEMENT A. Topsoil shall be placed over all areas disturbed during construction under any contract except those areas which will be paved, graveled or rip rapped. O B. Topsoil shall be spread in place for lawn and road shoulder seed areas at a 4-inch consolidated depth and at a sufficient quantity for plant beds and backfill for shrubs and trees. C. Topsoil shall not be placed in a frozen or muddy condition. 32309-006102500:08-03-15 02500-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS *owSECTION 02510 PAVING AND SURFACING PART 1 -- GENERAL 1.01 THE REQUIREMENT A. The Contractor shall furnish all labor,equipment and materials and perform all operations in connection with the construction of asphalt concrete pavement, asphalt concrete overlay, gravel roads, concrete curb and gutter, repair and reconstruction of existing asphalt concrete pavement, repair of existing gravel roads, and pavement markings complete as specified herein and as detailed on the Drawings. B. All new roads including the replacement of portions of the existing roads shall be to the limits, grades, thicknesses and types as shown on the Drawings. Patches for pipe crossings and areas damaged during the construction work shall be asphalt and/or gravel, depending upon the material encountered, unless otherwise indicated. 1.02 RELATED WORK SPECIFIED ELSEWHERE A. Requirements of related work are included in Division 1, Division 2 and Division 3 of these Specifications. `""" 1.03 RELATED SECTIONS A. Section 02200 - Earthwork B. Section 03300 - Cast-In-Place Concrete 1.04 STANDARD SPECIFICATIONS A. Except as otherwise provided in the Specifications or on the plans, all work shall be in accordance with the Virginia Department of Transportation Road and Bridge Specifications except that any reference to "VDOT", "Department" or"Unit" shall mean the "Owner". B. Except with the approval of the Engineer, the placing of asphalt concrete surface paving shall be subject to the Seasonal and Weather Restrictions set forth in VDOT Specifications. PART 2 -- MATERIALS 2.01 SELECT FILL N O N A. The Contractor shall place select fill as necessary to complete the embankments, A shoulders, subgrade foundation and replacement for removed unsuitable material in accordance with VDOT Section 303, and Section 02200, Earthwork. 32309-006102510:08-03-15 02510-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS PART 3 -- EXECUTION 3.01 EMBANKMENT A. The embankment shall be constructed in accordance with Section 02200, Earthwork. 3.02 SUBGRADE A. The subgrade, where shown on the Drawings, shall be compacted in accordance with Section 02200 - Earthwork. 3.03 BASE COURSE A. The finished base course of all paving shall be ABC and shall be of the thickness shown on the Drawings, formed true to crown and grade. Gravel roads, including repair to existing gravel roads shall be ABC and shall be of the thicknesses shown on the Drawings,formed true to crown and grade. No fill material except new ABC shall be placed on top of existing gravel. A. The finished base course of all paving shall be ABC and shall be of the thickness shown on the Drawings, formed true to crown and grade. Finished density shall be as specified in VDOT Section 309, Aggregate Base Course. 3.04 ASPHALT CONCRETE PAVEMENT A. Prior to placement of the asphalt concrete base course,the aggregate base course shall be inspected for damage or defects and repaired to the satisfaction of the Engineer. The surface of the base course shall be approved by the Engineer. B. The prime coat shall be applied to the surface of the approved base course as described in VDOT Section 311, Prime Coat. Equipment for applying the prime coat shall be power- oriented pressure spraying or distributing equipment suitable for the materials to be applied and approved by the Engineer. C. The asphalt concrete base shall be placed and compacted on the base course in layers not to exceed four inches. D. Prior to placement of the asphalt concrete surface course, the base/binder course shall be inspected for damage or defects and repaired to the satisfaction of the Engineer. E. The tack coat shall be applied to the surface of the approved base/binder course as described in VDOT Section 310. Equipment for applying the tack coat shall be power-oriented pressure spraying or distributing equipment suitable for the materials to be applied and approved by the Engineer. F. The Asphalt Concrete Surface Course shall be placed and compacted in accordance with requirements of VDOT Specifications. {'rrr+ 32309-006102510:08-03-15 02510-3 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS SECTION 02604 UTILITY STRUCTURES PART 1 -- GENERAL 1.01 THE REQUIREMENT A. Furnish all materials, labor, equipment, and tools required for the design, fabrication, delivery and installment of utility structures and appurtenances in accordance with the Drawings and as specified herein. 1.02 RELATED WORK SPECIFIED ELSEWHERE A. Section 02200— Earthwork B. Section 03200— Reinforcing Steel C. Section 03250—Concrete Accessories D. Section 03300— Cast-in-Place Concrete E. Section 03400— Precast Concrete Nosy- F. Section 05540 —Castings 1.03 REFERENCE SPECIFICATIONS, CODES AND STANDARDS A. Without limiting the generality of the other requirements of the specifications,all work herein shall conform to the applicable requirements of the following documents. All referenced specifications, codes, and standards refer to the most current issue available at the time of Bid. 1. Federal Specification No. SS-5-00210 - Gaskets 2. ASTM C478 — Specification for Precast Reinforced Concrete Manhole Sections 3. ASTM C857 — Minimum Structural Design Loading for Underground Precast Concrete Utility Structures 1.04 SUBMITTALS A. Submit samples and/or Shop Drawings in accordance with Section 01300, Submittals. B. In addition to items listed in Section 03400, Precast Concrete, Shop Drawings shall include, but not be limited to: 1. Complete layout and installation Drawings and schedules with clearly marked dimensions. 32309-006102604:08-03-1 5 02604-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS 2.02 BRICK A. Brick shall be sound, hard-burned common brick conforming to ASTM C32, Grade MS. 2.03 MORTAR A. Mortar shall conform to Section 04100 Mortar and Masonry Grout. 2.04 CONCRETE A. Concrete shall conform to Section 03300, Cast-in-Place Concrete. 2.05 REINFORCING A. Reinforcing shall conform to Section 03200, Reinforcing Steel. 2.06 PRECAST CONCRETE A. Precast concrete shall conform to Section 03400, Precast Concrete. 2.07 CONCRETE BLOCK A. Concrete block shall be solid, rectangular concrete masonry units conforming to ASTM C139. 2.08 CASTINGS fir. A. Castings shall conform to Section 05540, Castings. Casting shall be of the type and size indicated on the Drawings. 2.09 STEPS A. Steps shall be constructed of Grade 60 steel reinforcing rod(min. 1/2-inch)and completely encapsulated with a wear resistant and chemical resistant rubber. B. Each step shall have a minimum vertical load resistance of 800 pounds and a minimum pull- out resistance of 400 pounds. C. The steps shall have 11-inch minimum tread width and shall be placed at 16-inches on center, as shown on the Drawings. D. Steps shall be cast in place with the concrete. E. Steps shall only be installed as shown on the Drawings or required in the Specifications. 2.10 JOINT SEALANT A. Joint sealant shall be a Preformed Flexible Compound conforming to the requirements of Federal Specifications SS-S-00210,"Sealing Compound, Preformed Plastic for Pipe Joints", Type I, Rope Form. 32309-006102604:08-03-15 02604-3 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS 2.14 GRATES A. Grates shall comply with Section 05540, Castings. 2.15 CONCRETE BALLAST A. Concrete ballast shall be Class B concrete in conformance with Section 03300, Cast-in- Place Concrete. Ballast shall be provided as necessary to insure manhole resists flotation when empty and subjected to full height groundwater conditions. 2.16 FLEXIBLE JOINT SEALER A. Flexible joint sealer shall be a rubber ring waterstop as manufactured by Fernco Joint Sealer Co., or equal. 2.17 EPDXY BONDING AGENT A. Epoxy bonding agent shall conform to Section 03250, Concrete Accessories. PART 3 -- EXECUTION 3.01 DESIGN CRITERIA A. Minimum structural design loading for underground precast concrete vaults shall be as indicated in ASTM C857, unless otherwise noted herein. Precast items subjected to `"'p- vehicular traffic shall be designed for H-20 traffic loading. Other precast items shall be designed for a vertical live load of 300 psf. B. Walls of precast items shall be designed for a vertical surcharge of 100 psf. C. Precast manholes and vaults shall be designed to resist flotation when totally empty and subjected to groundwater full height of the manhole/vault. 3.02 FABRICATION AND CASTING A. Fabrication and casting shall conform to Section 03400, Precast Concrete, and to Section 03300, Cast-in-Place Concrete. B. All base sections designated to receive concrete ballast and all electrical manholes shall extend monolithically a minimum of 6 inches beyond the outside face of the wall for the entire periphery. All other utility structures shall have a standard base. C. Utility structures built around existing pipe shall have a cast-in-place base slab. 3.03 HANDLING, TRANSPORTING, AND STORING A. Handling, transporting and storing of precast items shall comply with Section 03400, Precast Concrete. 32309-006102604:08-03-15 02604-5 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS Nun, 6. Install a flexible joint sealer around the pipe. 7. Grout inside and outside of wall penetration with nonshrink grout. L. Backfill structures in accordance with Section 02200, Earthwork. M. Clean all structures of any accumulation of silt,debris,or foreign matter and keep clean until final acceptance of the work. N. Excavation shall conform to Section 02200, Earthwork. O. Structure bases shall bear on a minimum of 8 inches of compacted stone unless otherwise indicated on the Drawings. P. Channel Inverts 1. Inverts shall be placed using Class B concrete with forms sufficient to provide a smooth half-round shape as shown on the Drawings. Manhole bases employing full depth precast inverts are acceptable. 2. Where the slope of the line does not change through a manhole, a constant slope shall be maintained in the invert. Where slope changes occur within a given manhole,the transition shall be smooth and shall occur at the approximate center of the manhole. '"r' 3. Inverts shown on the Drawings are taken at the center of the manhole unless otherwise noted. 3.05 ADJUSTMENTS TO EXISTING UTILITY STRUCTURES A. Adjust structures as indicated on the Drawings using concrete or cast iron adjustment rings by approved methods. B. Clean covers and inlet castings of all foreign material and paint with one coat of coal tar epoxy. 3.06 ADJUSTING COLLARS AND FINAL ADJUSTMENTS A. Adjusting collars shall be as shown on the Drawings. Final adjustments shall be made so that the manhole ring and cover will be smooth and flush with the finished grade of the adjacent surface, or as otherwise indicated on the Drawings for manholes shown above grade. 3.07 FLUSHING AND TESTING A. Obstruction - After backfilling, all sewers shall be inspected for obstructions and shall be flushed with water. Flushing shall be a minimum velocity of 2.5 feet per second for a duration acceptable to the Engineer. Flushing shall remove all dirt,stones, pieces of wood and other debris which accumulated in the sewer during construction. The Contractor shall provide a means acceptable to the Engineer for removal of debris flushed from each section 32309-006102604:08-03-15 02604-7 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS section of sewer is defined as that length of sewer between successive manholes or special structures or stubouts for future connections. G. Cost of Testing and Repairs-Any and all work necessary to bring the line into conformance with the infiltration and deflection specifications shall be performed by the Contractor at no extra cost to the Owner. All apparent sources of infiltration and excessive deflection shall be repaired by the Contractor. The Contractor shall provide all water, plugs, hoses, pumps,equipment, etc. necessary for the proper flushing and testing of the sewers. - END OF SECTION - 32309-006102604:08-03-15 02604-9 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS SECTION 02831 STEEL FENCING PART 1 -- GENERAL 1.01 THE REQUIREMENT A. The Contractor shall furnish and install steel fencing, posts,gates,etc.,where shown on the Drawings and in compliance with these Specifications. B. Fencing shall be of the chain link type topped with barbed wire. The 6-foot high fabric shall clear the final grade by 3 inches,and shall be topped with three strands of barbed wire. The barbed wire shall be angled outward at the top. All components which are to be galvanized shall be hot dipped galvanized, coating to be 1.8 ounces per square foot of surface. Alternate coatings which employ a zinc coating of less than 1.8 ounces per square foot are not acceptable. 1.02 RELATED WORK SPECIFIED ELSEWHERE A. Section 03300 - Cast-in-Place Concrete. 1.03 SUBMITTALS A. Shop Drawings shall be furnished in accordance with Section 01300, Submittals. PART 2 -- PRODUCTS 2.01 CHAIN LINK FABRIC A. Fabric shall be 9 gauge aluminum coated wire woven in a 2-inch diamond mesh conforming to ASTM A491. Top and bottom selvage to have a barbed finish. Minimum weight of coating shall be 0.40 ounce per square foot of wire surface. The coated wire shall have a minimum tensile strength of 80,000 lbs. per square inch. B. Install fabric 3 inches above ground level. Fence shall be stretched tight and securely fastened to posts at points spaced 12 inches apart maximum. 2.02 POSTS A. Posts and rails shall be galvanized standard weight pipe conforming to the requirements of ASTM F1083. 0 0 0 0 1. Line Posts: Line posts shall be Schedule 40, 2-3/8 inch O.D. galvanized pipe with minimum bending strength of 201 pounds under a 6-foot cantilever load. Line posts shall be spaced at a maximum 10-foot O.C. 32309-006102831831:08-03-15 02831-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS N`"` C. Truss and stretcher bands shall be 1/8-inch x 7/8-inch pressed steel,supplied with carriage bolts and nuts. Bolts shall be 5/16-inch by 1 1/4-inch. Truss rods shall be 3/8-inch nominal diameter. 2.07 FABRIC TIES A. Wire ties shall be preformed 0.148-inch diameter(9 gauge)aluminum. Flat band type ties shall be 1100-H18 or 3003-H14, .064-inch thick by 1/2-inch wide. B. Hog rings for attaching tension wire to fabric shall be 0.105-inch diameter,Alloy 1100-H14. 2.08 GATES A. Gate frames shall be made of 2-inch O.D. ASTM F1083 pipe, 2.72 lbs. per foot hot dipped galvanized. Fabric shall match fence. Gate frames shall be welded or assembled with riveted corner castings. Gate frames shall be equipped with 3/8-inch diameter adjustable truss bars. Hinges shall be ball and socket. B. Gate shall be equipped with positive latching device with provision for padlocking. Personnel gates shall be minimum 36-inch clear opening. PART 3 -- EXECUTION 3.01 INSTALLATION A. All line posts shall be spaced equidistant in the fence line on a maximum of 10-foot centers. Posts shall be set plumb in concrete bases as detailed on Drawings. The top of the posts shall be brought to a smooth grade line. The wire fence shall be set accurately to line and grade and shall be plumb. B. End, corner, pull or intermediate posts shall be placed in the following locations: corners; changes in direction; abrupt changes in grade; intervals no greater than 500 feet in the fence line. Each end or gate post shall have one brace assembly and each corner or intermediate post shall have two brace assemblies. C. Horizontal braces shall be provided at all terminal posts, corner posts, and intermediate posts between top rail and ground and shall extend from the above-mentioned posts to the first adjacent line posts. Braces shall be securely fastened to the line posts by brace ends and brace bands and to the terminal posts by approved rail end connectors. Diagonal brace rods shall be trussed from the brace end on the line post back to the terminal post, corner post or intermediate post and fastened to it by an approved connector. 3.02 POST FOUNDATIONS A. Post holes shall be in true alignment and of sufficient size to provide a permanent foundation of concrete. Holes shall be well centered on the posts. A minimum diameter of 12 inches shall be required for all posts. 32309-006102831831:08-03-15 02831-3 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS NowSECTION 02910 FINAL GRADING AND LANDSCAPING PART 1 -- GENERAL 1.01 THE REQUIREMENT A. Furnish all labor, equipment,and materials necessary for final grading,topsoiling,seeding, and miscellaneous site work not included under other Sections, but required to complete the work as shown on the Drawings and specified herein. Under this Section, all areas of the project site disturbed by excavation, materials storage, temporary roads, etc., shall be reseeded as specified herein. 1.02 RELATED WORK SPECIFIED ELSEWHERE A. Section 02276 - Erosion and Sedimentation Control. B. Section 02500 - Surface Restoration. 1.03 SUBMITTALS A. Submit the following in accordance with Section 01300, Submittals. 1. Product Data 2. Certification of all materials 3. Three (3)copies of composition and germination certification and of test results for grass seed. PART 2 -- PRODUCTS 2.01 CONTRACTOR'S RESPONSIBILITIES A. Furnish and submit certification for the materials used as specified in the General Conditions, Division 1 and Division 2. 2.02 TOPSOIL A. Upon completion and Engineer's approval of the rough grading,the Contractor shall place the topsoil over all areas disturbed during construction under any contract except those areas which will be paved, graveled or rip rapped. Topsoil shall not be placed in a frozen or muddy condition and shall contain no toxic materials harmful to grass growth. Topsoil shall be as defined under Section 02200, Earthwork. 32309-006102910:08-03-15 02910-1 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS Minimum Minimum Maximum Seed Purity Germination Weed Seed Type (%) (%) (%) Kentucky 31 Tall Fescue 97 85 0.50 Perennial Ryegrass 98 90 0.50 Kentucky Bluegrass 97 85 0.50 Annual Ryegrass 97 90 0.50 Weeping Lovegrass 98 87 0.50 German Millet 98 85 0.50 Cereal (Winter) Rye 98 85 0.50 Redtop 94 80 0.50 C. Seed mixtures to be used on the project shall be as follows: P - 190#/acre Kentucky 31 Tall Fescue, 5#/acre Perennial Ryegrass, 5#/acre Kentucky Bluegrass TW - 50#/acre Annual Ryegrass, 50#/acre Cereal (Winter) Rye TSP -- 100#/acre Annual Ryegrass TSU -- 50#/acre German Millet N'""'' Note: PW - Permanent Seeding TW - Temporary Winter Seeding (Sept. 1St— Feb. 15th) TSP - Temporary Spring Seeding (Feb. 16th —Apr. 30th) TSU - Temporary Summer Seeding (May 1st—Aug. 31st) D. On cut and fill slopes 2:1 or steeper add 20#/acre of Weeping Lovegrass to the P seed mixture in the Spring and add 20#/acre Annual Ryegrass in Fall and Winter. 2.07 WOOD CELLULOSE FIBER MULCH A. For use in hydroseeding grass seed in combination with fertilizers and other approved additions, shall consist of especially prepared wood cellulose fibers such as "Conwed", "Silva-Fiber", or approved substitute, and have no growth or germination inhibiting factors, and be dyed green. B. The wood cellulose fiber shall have the additional characteristic of dispersing rapidly in water to form a homogeneous slurry and remain in such state when agitated in the hydraulic mulching unit, or adequate equal, with the specified materials. C. When applied, the wood cellulose fiber with additives will form an absorptive mat but not a plant inhibiting membrane,which will allow moisture, natural or mechanical,to percolate into underlying soil. D. Fiber mulch can be applied over top of newly seeded areas immediately after seed mixture is applied to soil bed or applied as part of the hydroseeded slurry containing the seed 32309-006102910:08-03-15 02910-3 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS substitute. Methods and rates of application shall be in strict compliance to manufacturer's Ne""` directions and acceptable to the Engineer. D. The herbicide selected shall be safe for use around ornamental plantings, have long-lasting weed control, and shall be resistant to leaching away under excessive rainfall. E. A second application of the herbicide shall be made on the surface of the landscape gravel or riprap sometime after the first six (6) months, but not later than twelve (12) months. Same methods and rates apply as specified previously. 2.13 TREE SHRUB PLANTING A. Provide trees and shrubs as shown on the Drawings and as specified in Section 3.37 of VESCH. PART 3 -- EXECUTION 3.01 GRADING A. After approval of the rough grading,the Contractor shall commence his preparations of the subgrade for the various major conditions of the work as follows: 1. Bare soil for riprap area at subgrade (24-inches below final grade, or as directed by the Engineer). 2. Topsoil for lawn and road shoulder seed area - scarify 2-inch depth of subgrade (4-inches below final grade) prior to placing topsoil. B. Final surface grading of the topsoiled, landscape graveled, and riprapped areas shall be mechanically raked or hand raked to an even finished surface alignment. 3.02 TOPSOIL A. Topsoil shall be spread in place for quantity required for lawn and road shoulder seed areas at 4-inch consolidated depth, and sufficient quantity for certain plant beds and backfill for shrubs and trees as specified. B. Topsoil shall be hospitable as a growth medium meeting all requirements as indicated by Sections 3.30 & 3.32 of VESCH. 3.03 HYDROSEEDING AND GRASS A. The Contractor shall grow a stand of grass on disturbed areas. The Contractor shall be responsible for the satisfactory growth of grass throughout the period of the one-year guarantee from Contract Closeout. B. The Contractor's work shall include the preparation of the topsoil and bare soil seed bed, application of fertilizer, limestone, mulching, inoculant, temporary soil stabilizer, watering, and other operations necessary to provide a satisfactory growth of sod at the end of the one-year maintenance period. 32309-006102910:08-03-15 02910-5 MOORES CREEK AWRRF ODOR CONTROL IMPROVEMENTS 3.04 SOIL STABILIZATION BLANKET (SSB) A. All channels and slopes indicated on the Drawings shall be lined with a SSB. The area to be covered shall be properly graded and hydroseeded before the blanket is applied. Installation shall be in accordance with Section 02276, Erosion and Sedimentation Control. 3.05 SOIL STABILIZATION MAT (SSM) A. All channels and slopes indicated on the Drawings shall be lined with a SSM. The area to be covered shall be properly graded before the mat is applied. Once the mat is placed and anchored, the area shall be seeded and mulched in accordance to this Specification and Section 3.36 of the VESCH. Installation shall be in accordance with Section 02276, Erosion and Sediment Control. 3.06 MAINTENANCE A. The Contractor shall be responsible for maintaining all seeded areas through the end of his warranty period. Maintenance shall include but not be limited to, annual fertilization, repair of seeded areas, irrigation (until permanent vegetation is fully established), and weed control. The Contractor shall provide, at his own expense, protection for all seeded areas against trespassing and damage at all times until acceptance of the work. Slopes shall be protected from damage due to erosion, settlement, and other causes and shall be repaired promptly at the Contractor's expense. B. Annual fertilization shall consist of an application of 500#/acre of 10-10-10 commercial grade fertilizer, or its equivalent and 60#/acre of nitrogen in early fall, or other analysis as may be determined by soil test. Annual fertilization shall be in addition to top dressing and shall be performed by the Contractor each fall season after planting until the work is substantially complete. C. Mowing shall be scheduled so as to maintain a minimum stand height of 4-inches or as directed by the Engineer. Stand height shall be allowed to reach 8 to 10-inches prior to mowing. D. All seeded areas shall be inspected on a regular basis and any necessary repairs or reseedings made within the planting season, if possible. If the stand should be over 60% damaged, it shall be re-established following the original seeding recommendations. E. Weed growth shall be maintained mechanically and/or with herbicides. When chemicals are used,the Contractor shall follow the current Virginia Agricultural Experiment Stations'weed control recommendations and adhere strictly to the instructions on the label of the herbicide. No herbicide shall be used without prior approval of the Engineer. 3.07 CLEANUP A. The Contractor shall remove from the site all subsoil excavated from his work and all other debris including, but not limited to, branches, paper,and rubbish in all landscape areas, and remove temporary barricades as the work proceeds. B. All areas shall be kept in a neat, orderly condition at all times. 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