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HomeMy WebLinkAboutWPO201700027 Plan - Stormwater 2017-12-08 STORMWATER MASTER PLAN REPORT FOR BrookhillDevelopment 2571 & 2575 Seminole Trail it Charlottesville,Albemarle County,VA BY BOHLER FNCINFFRING 28 Blackwell Park Lane k' Suite 201 Warrenton,VA 20186 BE#V152000 March 6,2017 ,,,, Revised August 1, 2017 $TH Q 46 Revised September 21,2017 Revised October 23,2017 DANIEL RAY HINES . Lk. No. 043176 . • • Daniel R.Hines,P.E. Seal Senior Project Manager APPROVED by theh rnanie Cot , .. C®�t4:�SY�744 1 3pIG14t f n Fr, tn. Pb o\ 1 nU..0_. _. RECEIVED NOV Z 9 2912 TABLE OF CONTENTS COMMUNITY OIVI Project History&Location 1 EEPMENT Project Design Approach 1 Applicable Technical Criteria 2 Site Constraints and Design Calculations 2 Soil Suitability 2 Stream Buffer Areas 3 100-Year Floodplain 3 Stormwater Management Strategy 3 Calculation&Drainage Area Basis 3 Water Quantity 4 Development Section 1 (Blocks 1,2,3,4,5,6,7,8,19) 4 Channel Protection 4 lir Flood Protection 5 Development Section 2 (Blocks 9,10,11) 5 Channel Protection 6 Flood Protection 6 Development Section 3 (Blocks 12,13) 6 Channel Protection 6 it Flood Protection 6 Development Section 4 (Blocks 14,15) 7 Channel Protection 7 Flood Protection 7 Development Section 5 (Blocks 16,17,18) 7 Channel Protection 7 Flood Protection 8 1 Water quality 8 Wet Detention Pond 8 Infiltration Trenches 8 v Proprietary Devices 8 Vegetated Filter Strip 8 Grass Channels 9 Nutrient Offset Credits 9 Development Section 1 (Blocks 1,2,3,4,5,6,7,8,19) 9 Wet Detention Pond 9 it Infiltration Trenches 9 Proprietary Devices 9 Vegetated Filter Strip 9 Development Section 2 (Blocks 9,10,11) 9 irs Wet Detention Pond 9 Vegetated Filter Strip 9 Development Section 3 (Blocks 12,13) 10 t■ Wet Detention Pond 10 Vegetated Filter Strip 10 Development Section 4 (Blocks 14,15) 10 i. Wet Detention Pond 10 Vegetated Filter Strip 10 it Development Section 5 (Blocks 16,17,18) 10 it Wet Detention Pond 10 Vegetated Filter Strip 10 Grass Channels 10 rw Project Summary 11 LIST OF APPENDICES Appendix A Figures 1. Vicinity Map 2. Project Location Map 3. NRCS Web Soil Survey Report 4. Pre Developments Drainage Area Map 5. Post Development Drainage Area Map 6. Post Pond Area Maps 7. Overlot Grading Plan 8. Critical Area Map Appendix B Tables 1. VRRM Treatment Summary 2. Land Cover Summary 3. Quantity Compliance Summary 4. Energy Balance Summary 5. Water Quality Summary Yr Appendix C 1. Approved Plan ZMA 2015-007 ism 2. Approved CLOMR Glossary I,„ 1. Energy Balance Note: The ultimate stream buffer/greenway shown is based on the"Wetlands&Waters of the U.S. Impact Map, Brookhill"Prepared by TNT Environmental,dated 7/6/16. lir r 6 Brookhill Stormwater Management Master Plan Bohler Engineering(Bohler) has been retained to prepare an overall stormwater management master plan for the Brookhill development. Project History&Location The project is located in the Hollymead community in the northcentral portion of Albemarle County, h northeast of the City of Charlottesville, Virginia. The site is northeast of the intersection of Route 29 (Seminole Trail) and Polo Grounds Road (VA Rte 643), and lies completely within the eight-digit Hydrologic Unit Code (HUC) area 02080204 (VAHU6 JR08). The site is split by an unnamed tributary 6 which drains south approximately 0.10 miles until it reaches the South Fork Rivanna River. The project Vicinity Map and Project Location Map are provided on the following pages as Figures A.1. and A.2. Previously, the site was mostly undeveloped with a large majority consisting of forested land or various streambeds and banks. The previous development on the site is a manor house, cemetery, and access road (herein referred to as the`Brookhill House Parcel"); occupying approximately 3.2 acres of the site. With the development of this property,the Brookhill House Parcel will remain and will be protected throughout construction activities. Project Design Approach Bohler has been tasked to develop an overall stormwater management master plan for the entire Brookhill development,which will provide for a basic stormwater management layout for each development section, depict several types of potential best management practices to be used on site, and establish potential locations for pond facilities to be used to address stormwater management requirements. This stormwater management master plan is intended to provide a quantifiable water quality and water quantity compliance ivi targets for the benefits of all parties as future development sections move forward. This report is intended to provide an overall design guideline for the future stormwater submittals,reviews and approvals,however it is to be acknowledged that the detailed design of each development section will be based on detailed constraints,code compliance analysis,and design that will require deviations from this master plan as the assumptions made in this report are refined. It is intended that these deviations will be within an acceptable tolerance of the assumptions made herein, and will be reviewed on a plan-by-plan basis for each development block, for compliance with the overall intent of the master stormwater plan. Since this stormwater management plan encompasses multiple sections of development,it should be noted that the requirements shown herein pertain to the development as a whole. If an individual development section should exceed the assumed treatment levels, it should be viewed as a credit towards the overall developments total stormwater treatment requirement that can be used to cover any deficiencies found in detailed design of later sections. However, each point of concentrated discharge shall be designed in accordance with water quantity regulations 9VAC25-870-66, while the development sections as a whole shall be designed in accordance with water quality regulations 9VAC25-870-63. This stormwater plan will not permit any section of development to be designed in a manner contrary to applicable stormwater regulations and good engineering practices. aka Page I 1 its Applicable Technical Criteria Stormwater management requirements for this master plan will be compliant with Part IIB of the most recent VSMP regulations, as identified below as they pertain to water quantity and water quality requirements. Water quantity requirements will be analyzed for each section of development at the applicable drainage points of interest (POI's) within each section for compliance with Virginia State Code Section 9VAC25- 870-66 "Water Quantity". The channel protection requirement of this section will be primarily met by satisfying the Energy Balance equation or by releasing non-erosive flow to the applicable limit of analysis. As stated within this report,the term"Energy Balance"shall refer to Virginia State Code section 9VAC25- 870-66. B.3.a, which provides the equation that is used to satisfy Channel Protection requirements. The flood protection requirements of this section will primarily be met by the reduction of post development stormwater flow below pre developed conditions or by providing an adequate channel to the applicable limit of analysis. Water quality requirements will be calculated for the entire Brookhill development as a whole for compliance with Virginia State Code Section 9VAC25-870-63 "Water Quality Design Criteria" to set an overall treatment requirement for the development.Additionally,each development block will be analyzed it to show the individual contribution of that section to the overall phosphorus removal requirements for the project.The post development phosphorus removal requirement(in pounds of total phosphorus per year or lbs/yr) will be calculated using the Virginia Runoff Reduction Method (VRRM) for New Development spreadsheet, as provided by the Virginia Department of Environmental Quality. This calculated treatment load will be met through a variety of measures including Wet Detention Ponds,Grass Channels,Infiltration systems,Bioretention systems,Filtering Practices and the purchase of Nutrient Offset Credits. Additional Stormwater Management requirements for this plan have been provided in the Code of Development for the approved Zoning Map Amendment ZMA 2015-007. These requirements will be iir adhered to throughout the design and construction of the entire Brookhill development. Specifically, in regards to phasing, the property shall be developed within no less than (4) phases, with the first phase limited to 80 acres of disturbance and the subsequent phases limited to a maximum of 60 acres of disturbance.This disturbed area is inclusive of roadways improvements,utility installation and construction of the stormwater management facilities and erosion and sediment control facilities. Additionally, all stormwater management facilities shall be located outside of the buffer areas, development lots,preserved slopes, greenway areas, stream buffers and floodplains throughout the property. Site Constraints and Design Considerations Soil Suitability: Suitability of project soils to be used for infiltration purposes was determined using the Hydrologic Soil Groups (HSG), soil permeability (Ksat) and the depth to the water table as specified in the NRCS web soil survey for the project area. A copy of the NRCS web soil survey report has been provided in appendix A.3. for reference. Page2 rr While site grading operations are anticipated to be extensive in both areas of cut and fill, their impact on the ability of post developed soils to infiltrate water has been assumed to be minimal due to overall predominance of HSG B type soils with moderate to high permeability factors. To provide a more conservative assumption for overall design, the design infiltration rate has been assumed on the low end of the soil permeability rate specified in the NRCS report. Specific infiltration tests will be provided with the final detailed design for all proposed infiltration facilities. Stream Buffer Areas: This site contains significant stream buffer areas, primarily located on the southwestern corner of the site and along the boundaries of each development section within the center of the site. In compliance with Albemarle County Water Protection Ordinances (WPO), a one-hundred-foot buffer from these stream areas has been provided in the site layout with proposed impacts being minimal from proposed grading activities. Any impacts to these stream buffer areas will be minimized and shall only occur in those areas shown on the approved Zoning Map Amendment Plan ZMA 2015-007. its 100-Year Floodplain: Portions of the existing streams separating the site are located with the mapped 100-Year FEMA irt floodplain, however no portion of the site is located with the FEMA floodway. The only impacts to the existing floodplain and floodway are anticipated to be channel improvements for the outlet channel and will be designed and permitted as necessary with the detailed design of each section. A CLOMR has been submitted to FEMA for the minor grading activities associated with the channel improvements at the outlets and the Polo Grounds road improvements. A copy of the approved CLOMR will be attached to this report in Appendix C-2 upon receipt. Stormwater Management Strategy: In an effort to provide an accurate and practical strategy to address the stormwater quantity and quality requirements for this development,each development section was analyzed for compliance individually at each of its applicable stormwater POIs. The total of these individual analyses will create the baseline for the stormwater management expectations from the entire development. As each block within each development section is developed and analyzed in detail, they will be compared to the conceptual design assumptions to identify the impact of deviations and ensure the overall site still meets the stormwater requirements. Additionally, each block will be developed in accordance with applicable stormwater regulations, with each concentrated outfall point being analyzed for compliance with applicable water quantity regulations. Each block will be analyzed as part of the entire section to ensure compliance with applicable water quality regulations. Calculation& Drainage Area Basis: Yr The pre and post development flows shown in this report were calculated using the SCS TR-55 method and modeled through the AutoCAD Hydraflow Hydrographs program. This method was chosen as it can more accurately model the existing soil types,land covers,and drainage area sizes. 1,. The drainage areas,curve numbers and times of concentration used in these calculations were based on overall site assumptions and are intended to be refined and revised with the detail design of each development section. �Ir An aerial flown topographic survey was used to establish the existing site topography. This survey was then used to subdivide each development section into individual drainage sheds and identify Page 13 it different POIs based on those areas.These POIs will serve as the point of analysis for all stormwater quantity calculations for both the pre and post development conditions. A map identifying the points of interest has been provided on figure A.S. Post developed drainage areas were defined i,,, based on assumed grading and drainage patterns. Curve number calculations for the pre and post developed conditions were based on the Curve lila Number values found in the SCS TR-55 manual in Table 2.2a"Runoff Curve Numbers for Urban Areas"and Table 2.2c"Runoff Curve Numbers for Other Agricultural Lands". The corresponding hydrologic soil groups were identified using the NRCS web soil survey mapper, which identified primarily B type soils within the site boundaries. Using this information,weighted curve numbers were developed for the pre developed condition based on available aerial imagery and field verifications. Curve numbers were developed for the post developed condition based on the anticipated development patterns and assumed impervious and pervious areas. Time of concentration calculations were developed for each pre development drainage area utilizing the sheet flow roughness coefficients found in the TR-55 manual table 3-1 "Roughness Coefficients for sheet flow". These values were applied within the Hydraflow Hydragraphs program to calculate the time of concentration values found in the supplied tables for the pre developed flows. Post developed time of concentrations were assumed to be five (5) minutes to provide a conservative estimate when developing pond capacities and allowable flows. It is intended that these time of concentration assumptions will be refined in the detailed design of each section. Water Quantity As noted in the previous sections,the stormwater quantity requirements of the VSMP Part IIB will be met by satisfying channel protection and flood protection requirements in each development section for each point of concentrated outfall. A detailed breakdown for how each development section will accomplish this has been provided below. Development Section 1(Blocks 1,2,3,4,5,6,7,8,19): The section 1 development encompasses approximately 119 acres and consists of a mix of multi- family residential apartments, a senior living facility, commercial retail, single family attached townhomes and single family detached houses. This section was found to have eleven(11)unique POIs(denoted as POIs 1 — 11)located to the north and east of the site along the existing creek,and to the south of the site at each of the exiting road culverts. These points of interest and drainage sheds have been identified on the tables and figures provided in appendices A and B. Channel protection requirements for this section are intended to be met by decreasing the post development drainage areas and associated runoff volumes for POIs 2,3, 5, 6, 8, and 9 while utilizing vegetated filter strips with level spreaders to attenuate the flow and release it as sheetflow to satisfy the requirements of 9VAC25-870-66 subsection D. It should be noted that if during the detail design of this section,it is not feasible to release this flow as sheetflow, these POIs will be redesigned to meet the requirements of the Energy Balance equation. An overall Section 1 map has been provided in figure A.S., illustrating the location and drainage areas for each POI. ir. The post development flow for POI 1 will be attenuated through an underground detention facility while POI's 10 and 11 will be attenuated through the implementation of a wet aps Page 14 storage surface pond. It is intended that the outlet control structures for these detention facilities will attenuate the flows to meet the requirements of the Energy Balance Equation. The post development flow for POI'S 4 and 7 will be redirected to flow into separate wet aim detention ponds for partial attenuation of the post developed flow. It is anticipated that these wet detention ponds will allow for an increased flow from the pre developed condition to the post during a 2-year storm event. In accordance with 9VAC25-870-66 subsection 1.A. a manmade outfall channel will be provided from the pond outfalls, crossing under Polo Grounds Road and flowing to the Rivanna River. At the confluence of the existing creek and the Rivanna River,the upstream drainage area to that point in the river is approximately 260 square miles at which the site drainage area will be significantly less than one percent (1%) of the overall contributing drainage area. This will satisfy the Limits of Analysis requirements of subsection 4.A. Calculations and a typical cross sections will be provided with final engineering plans to show how this channel will maintain non-erosive flows from the pond outfalls to the outfall at the river. rr Flood Protection requirements for this section are intended to be met by releasing the post developed flow as sheetflow, satisfying the requirements of 9VAC25-870-66 subsection air D,for POIs 2, 3, 5,6,8,and 9. If it is found during the detail design of this section that it is not feasible to release the flow as sheetflow, these POIs will be redesigned to meet the requirements of subsection 2.b. and reduce the post developed 10-yr flow below pre development rates. For all POIs, the post development flows will be analyzed until the point that they reach the on-site 100-year FEMA floodplains or until they have reached a point that they are less than one percent 1%of the contributing watershed. The post development flow for POI Twill be attenuated through an underground detention system and controlled to release the post developed 10-year flow at a rate lower than pre development. Similarly, POI's 10 and 11 will a wet storage surface pond to attenuate the ar` post developed 10-year flow below the predevelopment rate. The post development flow for POI's 4 and 7 will be redirected to flow into separate wet +� detention ponds for partial attenuation of the post developed flow. It is anticipated that these wet detention ponds will allow for an increased flow from the predeveloped condition to the post during a 10-year storm event. In accordance with subsection C.2.A.,the outfall wpm channel provided from the pond outfalls to the point at which the site drainage area is less than 1%will be designed to provide adequate capacity to convey the 10-year storm event within the conveyance system. Calculations and a typical cross section will be provided with final engineering design to show the capacity of the conveyance system during a 10- year storm event. `,• Development Section 2 (Blocks 9,10,11): The Section 2 development encompasses approximately 29 acres and consists of primarily single family residential houses,an apartment building,and associated infrastructure improvements. This section was found to have a single POIs(denoted as POI 12)located to the south along the existing creek. An overall map has been provided in appendix A.S. depicting the location of the point of interest as well as the proposed detention pond. iMr i. Page 15 kis Channel protection requirements for this section are intended to be met by satisfying the energy balance equation at the outlet of the stormwater detention pond and by releasing the drainage from the rear of the residential parcels adjacent to the creek as sheet flow. ii. The post development flow to the single POI will be attenuated through a wet stormwater detention pond, which has been sized to provide adequate treatment volume for water quality, as well as releasing the 1-year flow to meet energy balance. Along the rear of the parcels adjacent to the existing creeks, a combination of vegetated berms and level spreaders will be used to detain any runoff and release it as sheetflow, in accordance with section D requirements. Flood Protection requirements for this section are intended to be met by detaining the 10- year post development storm event within the proposed wet pond and releasing it at a rate below pre development. The runoff from the rear of the residential parcels adjacent to the creeks will release the post development flow as sheetflow. The measures described previously to meet channel protection will be utilized in the same manner to satisfy flood protection requirements. Development Section 3 (Blocks 12,13): sta The Section 3 development encompasses approximately 27.5 acres and consists of primarily single family residential houses and associated infrastructure improvements. This section was found to have a single POI(denoted as POI 13A) located to the south along the existing creek at the outlet of the proposed pond.An overall map has been provided in appendix A.S. depicting the location of the point of interest as well as the proposed detention pond. it Channel protection requirements for this section are intended to be met by satisfying the energy balance equation at the POI located at the outlet of the stormwater detention ponds and by releasing the drainage from the rear of the residential parcels adjacent to the creek +R as sheet flow. The post development flow to the single POI will be attenuated by the wet stormwater detention pond denoted as 13A, which has been sized to provide adequate treatment volume for water quality,as well as releasing the 1-year flow to satisfy the energy balance equation. Along the rear of the parcels adjacent to the existing creeks, a combination of ,, vegetated berms and level spreaders will be used to detain any runoff and release it as sheetflow, in accordance with Section D requirements. Flood Protection requirements for this section are intended to be met by detaining the 10- i" year post development storm event within the proposed wet pond and releasing it at a rate below predevelopment. The runoff from the rear of the residential parcels adjacent to the creeks will release the post development flow as sheetflow. The measures described previously to meet channel protection will be utilized in the same manner to satisfy flood protection requirements. it it 4 Page 16 j, Development Section 4 (Blocks 14,15): The Section 4 development encompasses approximately 29 acres and consists of primarily single family residential houses and associated infrastructure improvements. This section was found to have a single POI(denoted as POI 13B) located to the south along the existing creek at the outlet of the proposed pond.An overall map has been provided in appendix A.S. depicting the location of the point of interest as well as the proposed detention pond. Channel protection requirements for this section are intended to be met by satisfying the energy balance equation at the POI located at the outlet of the stormwater detention ponds and by releasing the drainage from the rear of the residential parcels adjacent to the creek as sheet flow. The post development flow to the single POI will be attenuated by the wet stormwater detention pond denoted as 13B,which has been sized to provide adequate treatment volume for water quality,as well as releasing the 1-year flow to satisfy the energy balance equation. Sim Along the rear of the parcels adjacent to the existing creeks, a combination of vegetated berms and level spreaders will be used to detain any runoff and release it as sheetflow, in accordance with Section D requirements. Flood Protection requirements for this section are intended to be met by detaining the 10- year post development storm event within the proposed wet pond and releasing it at a rate below predevelopment. The runoff from the rear of the residential parcels adjacent to the creeks will release the post development flow as sheetflow. The measures described previously to meet channel protection will be utilized in the same manner to satisfy flood protection requirements. aa Development Section 5(Blocks 16,17,18): The Section 5 development encompasses approximately 73 acres and consists primarily of single family residential houses.This section was found to have a four(4)POIs(denoted as POIs 14,15,16, and 17), with two (2) located to the west along the existing creek, one (1) located to the south at the polo grounds road culvert and one(1)to the east along an existing drainage channel.An overall map has been provided in appendix A.S. depicting the location of the point of interest as well as the proposed detention ponds. Channel protection requirements for this section are intended to be satisfied through different methods across the development section. For POI 17 this requirement is met by decreasing the post development drainage area and runoff volume, while utilizing vegetated filter strips and level spreaders to attenuate the runoff and release it as sheetflow. The post development flow for POIs 14 and 15 will be attenuated through multiple wet i■ stormwater detention ponds,which have been sized to provide adequate treatment volume as well as releasing the 1-year flow at a rate that satisfies the energy balance equation. The post development flow for POI 16 will be partially attenuated through a proposed wet detention pond.This wet detention pond will allow for an increased post development flow from the 2-year storm event to be released to the outfall channel improved for the development section 1 flows. This channel will be improved so the 2-year flows are non- erosive and will be analyzed to the point the channel reaches the Rivanna River, at which it will be less than one percent(1%) of the total contributing watershed area. L» Page 17 Flood Protection requirements for this section are intended to be met through a variety of methods across the development section, however the measures used to satisfy this requirement will be the same measures previously described to meet channel protection. The post development flow to POI 17 will be released through various level spreaders as sheetflow to the existing drainage channel. The post development flow for POIs 14 and 15 will be detained within the wet stormwater detention ponds and released at a rate below pre development. The post development runoff flow from POI 16 will be increased from pre development, however the outfall channel improved with development Section 1 will be adequately sized to contain the 10-year storm event to the point of analysis at the Rivanna River. Water Quality: The Stormwater Quality treatment requirements for this site will be met utilizing the 2011 VRRM details, worksheets and standards. Overall quality requirements will be analyzed for the entire development as a whole, and for each development section to show the contribution of that section towards meeting the i" overall development treatment goal. The overall treatment requirements based on the assumed future developments was found to be approximately 175.5 lbs/year; as shown in appendix B, table B.1. Utilizing the treatment measures outlined below,this site would generate approximately 176 lbs/year of phosphorus removal,therefore exceeding the required treatment rate. To provide a more conservative treatment assumption,it was assumed that each measure provided will be i, a level 1 design. A detailed breakdown of each measure that is anticipated to be used across the entire development has been provided below. Wet Detention Pond: Multiple wet detention ponds are proposed within the development to attenuate the post development flows and to provide treatment for stormwater runoff prior to leaving the site. This measure was chosen since it provides 50% Phosphorus removal efficiency and can be used to attenuate the runoff flow for water quantity requirements. These measures would also be used as the final treatment for runoff before leaving the site and will utilize the"treatment train"effect with any upstream treatment measures. The relative size, location and elevations of these facilities have been shown on figure A.6. The footprints and design volumes of these facilities have been approximated based on the anticipated post developed drainage areas,however these are subject to change during the final detailed design. In any development section where the proposed wet pond is being utilized for stormwater treatment or stormwater management,the pond shall be constructed prior to development of the development blocks it services. Infiltration Trenches: Infiltration trenches are proposed to be used at the beginning of the larger drainage areas in conjunction with any underground detention systems to achieve a phosphorus removal efficiency of 25%in the more highly impervious areas,while keeping the total contributing drainage areas small.This measure is anticipated to also achieve a 50%runoff reduction due to the underlying HSG B type soils. Proprietary Devices:While multiple proprietary devices have been proposed within the proposed storm sewer system, they have all been assumed to be various types of Hydrodynamic separators achieving a phosphorus removal efficiency of 20% as established by the Virginia BMP Page 18 Clearinghouse. These devices were chosen since they have the ability to be installed in-line with the proposed storm sewer system, and are effective pretreatment measures when used upstream of underground detention facilities or infiltration trenches. Vegetated Filter Strip: The vegetated filter strips have been proposed in a majority of the smaller drainage areas, mainly at the rear of the residential areas abutting the stream buffer areas. The vegetated filter strips are an ideal runoff reduction measure since a majority of the site contains HSG B type soils and the stream buffer areas cannot be developed. While the filter strips do not achieve any phosphorus removal, they are an ideal measure to be used for runoff reduction along it the residential areas since the site is predominately HSG B type soils. Grass Channels: Grass channels will be provided across the site as an overland conveyance, generally in combination with other measures, to provide a minimal amount of treatment while routing water to specific drainage points. Nutrient Offset Credits: Based on coordination with local nutrient credit banks, there are an excess of credits available within this watershed and multiple existing facilities have capacity to handle the required load from this project. The location of the nutrient offset credit generating facility used for this site will be determined during the detailed design of each section. Pursuant to VAC 870-69 sections B and C, this site will obtain the maximum amount of nutrient offset credit by purchasing credits for up to approximately 25% of the total required treatment load. Furthermore, the Nutrient Offset Credits for each phase of development shall be acquired prior to the commencement of land disturbance within that phase. As currently projected the overall site will require approximately 34 lbs/yr of Nutrient Offset credits to be purchased,however based on the current required total treatment load,this could increase up to 43 lbs/yr. Development Section 1(Blocks 1,2,3,4,5,6,7,8,19): This development section has been preliminarily designed to treat approximately 65.85 lbs/year through the use of various treatment measures outlined below. Additionally,a summary table from the VRRM worksheet has been provided in appendix B.1. to show the calculated removal amounts. Wet Detention Ponds: As currently designed the wet ponds would treat approximately 30.56 acres within Section 1 (15.28 acres impervious, 15.28 acres permeable)to provide a total phosphorus removal of 31.77 lbs/year. Infiltration Trenches: As currently designed the Infiltration Trenches would treat approximately 20 acres within Section 1 (15 acres impervious, 5 acres permeable) to provide a total phosphorus removal of 21.71 lbs/year. atipH Proprietary Devices: As currently designed the Proprietary Devices would treat approximately 10 acres within Section 1 (5 acres impervious,5 acres permeable)to provide a total phosphorus removal of 2.62 lbs/year. Vegetated Filter Strip: As currently designed the Vegetated Filter Strips would treat approximately 16.44 acres within Section 1 (3.22 acres impervious, 13.22 acres permeable) to provide a total phosphorus removal of 9.74 lbs/year. Development Section 2 (Blocks 9,10,11): ii. Page 19 (i. Iva This development section has been preliminarily designed to treat approximately 9.73 lbs/year through the use of various treatment measures outlined below.Additionally,a summary table from the VRRM worksheet has been provided in appendix B.1.to show the calculated removal amounts. Wet Detention Ponds: As currently designed the Wet Ponds would treat approximately 12.30 acres within Section 2 (6.15acres impervious, 6.15 acres permeable) to provide a total phosphorus removal of 8.06 lbs/year. Vegetated Filter Strip: As currently designed the Vegetated Filter Strips would treat approximately 1.70 acres within Section 2 (0.85 acres impervious, 0.85 acres permeable) to provide a total phosphorus removal of 1.67 lbs/year. Development Section 3 (Blocks 12,13): This development section has been preliminarily designed to treat approximately 15.08 lbs/year through the use of various treatment measures outlined below.Additionally,a summary table from the VRRM worksheet has been provided in appendix B.1.to show the calculated removal amounts. Wet Detention Ponds: As currently designed the Wet Pond would treat approximately 13.94 acres within Section 3 (6.97 acres impervious, 6.97 acres permeable) to provide a rrr total phosphorus removal of 9.13 lbs/year. Vegetated Filter Strip: As currently designed the Vegetated Filter Strips would treat w approximately 6.06 acres within Section 3 (3.03 acres impervious, 3.03 acres permeable) to provide a total phosphorus removal of 5.95 lbs/year. Development Section 4(Blocks 14,15): This development section has been preliminarily designed to treat approximately 14.09 lbs/year through the use of various treatment measures outlined below.Additionally,a summary table from y., the VRRM worksheet has been provided in appendix B.1.to show the calculated removal amounts. Wet Detention Ponds: As currently designed the Wet Pond would treat approximately 21.46 acres within Section 4(10.73 acres impervious, 10.73 acres permeable)to provide a total phosphorus removal of 14.06 lbs/year. Vegetated Filter Strip: As currently designed the Vegetated Filter Strips would treat it approximately 5.0 acres within Section 4(0.02 acres impervious,0.02 acres permeable)to provide a total phosphorus removal of 0.04 lbs/year. Development Section 5 (Blocks 16,17,18): This development section has been preliminarily designed to treat approximately 36.81 lbs/year through the use of various treatment measures outlined below. Additionally,a summary table from the VRRM worksheet has been provided in appendix B.1.to show the calculated removal amounts. Wet Detention Ponds: As currently designed the Wet Ponds would treat approximately 50.82 acres within Section 5 (25.41 acres impervious, 25.41 acres permeable)to provide a total phosphorus removal of 33.29 lbs/year. S Vegetated Filter Strip: As currently designed the Vegetated Filter Strips would treat approximately 2.18 acres within Section 5 (1.09 acres impervious, 1.09 acres permeable) to provide a total phosphorus removal of 1.43 lbs/year. Page I10 eft i,,, Grass Channel: As currently designed the Grass Channel would treat approximately 5.0 acres within Section 5 (2.5 acres impervious, 2.5 acres permeable) to provide a total phosphorus removal of 2.10 lbs/year. 4 Project Summary As outlined in this report, the Brookhill development will require a variety of different measures to be implemented to ensure that the stormwater runoff leaving the site will improve the water quality and have a positive impact on all downstream areas. As currently projected, the overall site will have a deficit of approximately 34 lb/yr of phosphorus removal after other onsite water quality features have been provided. its This deficit will be made up through the purchase of offsite nutrient credits so that the development achieves the required phosphorus reduction per the VRRM spreadsheet. As each section develops and detailed i` runoff numbers are determined, the overall development requirement will be reevaluated, on an ongoing basis, to ensure that the current development meets water quality standards. Finally, on a needed basis nutrient credit purchases will be provided for each section as the development progresses. It is intended that the measures outlined within this report provide a conceptual idea of how stormwater runoff can be adequately managed and treated. These measures are intended to be refined, modified and possibly replaced during the detailed design of this development through the iterative engineering design process based on input provided by Albemarle County and the Virginia Department of Environmental Quality. Jar irk i. lr. irk tie Page 111 I I I L I I I I I I I I I I I I in ire its Appendix A Figures Figure 1 Vicinity Map I dC`"°� alapaBr !NI-,..tr nWnc �s �^ �`. lePn6n: Pky. 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LOCATION MAP COPYRIGHT ADC THE MAP PEOPLE PERMIT USE NO.20602153-5 SCALE: 1"=2000' no ow H:\15\V152000\DRAWINGS\EXHIBITS\XH-MAP EXHIBIT\V15200XHO.DWG PRINTED BY:EVAN.NEWMAN 3.07 17 @ 5.08 PM LAST SAVED BY:EVAN.NEWMAN PROJECT NAME. 1 ROOKHI T ROUTE 29 SEMINOLE TRAIL RD AND POLO GROUNDS RO.AI) CHARLOTTESVILLE VA SHEET TITLE: / L E VICINITY MAP � R SHEET1OF1 ENGINEERING --- DATE: CAD ID: PROJECT NUMBER: 28 BLACKWELL PARK LANE,SUITE 201 WARRENTON,VA 20186 1".2000' 03102117 XHO_ V15200 PHONE:(540)349-4500 FAX:(540)349-0321 ea Figure 2 Project Location Map Ole r C.; a Ifs' 4ti is � k` ar�. MI kg CcI.,"‘''' ��¢ NUM fi ,.;4 fP,+ Rivanna 5 ja gyp, 4a Hollyrread tiro (,V r-', T 2fi ate` t ON ffil, Praffit SITE ...... 6,, N 43, H�rdrau lic ° G,; c,ark� mo 5. Carrsbrook yf k }a o _c- ar Berkeley ,it, Westr'ioreland 4 WM 41, 4.o- au I, "" 611 1 Eastham Wakefield 4,1:.Rio co,--, WI n. LOCATION MAP COPYRIGHT ADC THE MAP PEOPLE PERMIT USE NO.20602153-5 SCALE: 1"=5000' a H:\15\V152000\DRAWINGS\EXHIBITS\XH-MAP EXHIBIT\V15200XH0.DWG PRINTED BY:EVAN.NEWMAN 3.07.17 @ 5:09 PM LAST SAVED BY.EVAN.NEWMAN NM PROJECT NAME. It ROOKIILLI J ROUTE 29 SEMINOLE TRAIL RD AND POLO GI'OUNDS ROAD CHARLOTTESVILLE.VA SHEET TITLE. PROJECT LO CATION MAP BOHLER rSHEET1OF1 ce) ENGINEERING SCALE: DATE: CAD ID: PROJECT NUMBER: 28 BLACKWELL PARK LANE,SUITE 201 WARRENTON,VA 20186 1%2000' 03102117 XHO V15200 PHONE:(540)349-4500 FAX:(540)349-0321 arag • Figure 3 NRCS Web Soil Survey Report Ors is Ss "' _USDA United States A product of the National Custom Soil Resource Department of Cooperative Soil Survey, Agriculture a joint effort of the United Report for \ 'CS States Department of Agriculture and other Al b e m a r l e Federal agencies, State Natural agencies including the Resources Agricultural Experiment Conservation Stations, and local C o U n�y, Vi rg i n i a Service participants S S no T am ^' • 9 w I � , "y1. .1.*"*, y ''c^ TA.l ` me / 4.4 i: 4,'. ' ., *.;i -... . MR !Y . ..` .. m r. a, ._ d . i _ p a_ p �4 bra � � ?'Y' ik i'' .� ��im�mmem� 000 ft -, `� - March 7, 2017 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for it many different users, including farmers, ranchers,foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/ portal/nrcs/main/soils/health/)and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nrcs)or your NRCS State Soil Scientist(http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS)has leadership for the Federal part of the National Cooperative Soil Survey. Ole Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. r" The U.S. Department of Agriculture (USDA)prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require it 2 err ire alternative means for communication of program information (Braille, large print, audiotape, etc.)should contact USDA's TARGET Center at(202)720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800)795-3272 (voice)or(202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. IMO w. it Me ri INN f` 3 4 fl�r Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 8 its Soil Map 9 Legend 10 Map Unit Legend 11 Map Unit Descriptions 11 Albemarle County, Virginia 14 16—Chewacla silt loam 14 27B—Elioak loam, 2 to 7 percent slopes 15 am 27C—Elioak loam, 7 to 15 percent slopes 16 27D—Elioak loam, 15 to 25 percent slopes 17 28D3—Elioak clay loam, 15 to 25 percent slopes, severely eroded 18 34B—Glenelg loam, 2 to 7 percent slopes 19 • 34C—Glenelg loam, 7 to 15 percent slopes 20 34D—Glenelg loam, 15 to 25 percent slopes 21 39D—Hazel loam, 15 to 25 percent slopes 22 rr 39E—Hazel loam, 25 to 45 percent slopes 23 76—Riverview loam 24 83—Toccoa fine sandy loam 25 95—Wehadkee silt loam 26 96B—Worsham loam, 2 to 7 percent slopes 27 References 28 air 4 rr. Yr How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and +w limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas(MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform,a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. •,,, Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil-vegetation-landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes(units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. its The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite lilt investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil-landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil-landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of i" characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field-observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. sr' Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, is soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and ir. 6 Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. rr. i1r it it ti lir 7 it. i` •r Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. �r. I. ire �Yr frw Yr it 8 v W km N 2 Z A 4215800 4220000 4IN2LU 4710400 4710600 4Z2MA) 4221000 4221200 4221400 INIS 78°27 53"W i, 7 ! . 78°27 53"W .r. 3 0 0 3 a, .Ai d. 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N a, n O 0 C • ca o _ TT Cr N co ] al CD CCDj 3 C N CD c CD S 7 N m a, -,, F - v -< 8O m o 3 SD m m C) 3 0 ✓ m o S CD o -' < D m C Cn a 0 13 0 m D < c0 n N a, c1 O N a w N CDC 3 s 3- Z o- < S 0 0 fD `° _ 3 cU O Co aa) n c Q N C CCD cJ o c '0 CD Z i CD _ N -O cD — < Cn '6 (O a N a (D cD 3 co 3. oo 0 3 c N' c a, a 7 c ,T,' al a O n o a, O I CD a N SM. co C. a o ` m d Co w o N c a, a, a A co fD O s fir Custom Soil Resource Report Map Unit Legend Albemarle County,Virginia(VA003) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 16 Chewacla silt loam 7.1 2.2% 27B Elioak loam,2 to 7 percent 54.3 16.7% slopes 27C l Elioak loam,7 to 15 percent 46.9 14.4% slopes 27D Elioak loam,15 to 25 percent 9.0 2.8% slopes 28D3 Elioak clay loam, 15 to 25 2.0 0.6% percent slopes,severely rw eroded 34B Glenelg loam,2 to 7 percent 10.0 3.1% slopes 34C Glenelg loam,7 to 15 percent 41.8 12.9% slopes 34D Glenelg loam,15 to 25 percent 47.9 14.8% slopes 39D Hazel loam,15 to 25 percent 80.2 24.7% slopes 39E Hazel loam,25 to 45 percent 7.8 2.4% slopes 76 Riverview loam 0.4 0.1% 83 !,Toccoa fine sandy loam 0.3 0.1% — 95 Wehadkee silt loam 16.5 5.1% 96B Worsham loam,2 to 7 percent 0.7 0.2% slopes Totals for Area of Interest 324.8 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. r A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some ilr observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made 11 iti. w Custom Soil Resource Report ail up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components.They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, it onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion,and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example,Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. +�+ These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. r" The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The iive pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. 12 Custom Soil Resource Report An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil ass material and support little or no vegetation. Rock outcrop is an example. i. is its i• Yr 13 L Custom Soil Resource Report Albemarle County, Virginia 16—Chewacla silt loam Map Unit Setting National map unit symbol: kb87 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Prime farmland if drained and either protected from flooding or not frequently flooded during the growing season Map Unit Composition it Chewacla and similar soils: 85 percent Minor components: 3 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Chewacla Setting Landform: Flood plains Down-slope shape: Linear Across-slope shape: Linear Parent material: Residuum weathered from granite and gneiss Typical profile H1 -0 to 8 inches: silt loam H2-8 to 16 inches: silt loam H3- 16 to 26 inches: silty clay loam H4-26 to 40 inches: silty clay loam H5-40 to 79 inches: silt loam it Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Somewhat poorly drained Runoff class: Very high Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: About 6 to 18 inches Frequency of flooding: Occasional Frequency of ponding: None Available water storage in profile: High (about 11.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3w Hydrologic Soil Group: B/D Hydric soil rating: No 1r Minor Components Wehadkee Jim Percent of map unit: 3 percent Landform: Flood plains Down-slope shape: Linear fir 14 Custom Soil Resource Report Across-slope shape: Linear Hydric soil rating: Yes 1 ii r 27B—Elioak loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: kb8y Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F ism Frost-free period: 195 to 231 days Farmland classification: All areas are prime farmland ilr Map Unit Composition Elioak and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Elioak Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across-slope shape: Convex Parent material: Residuum weathered from mica schist Typical profile H1 -0 to 8 inches: loam H2-8 to 39 inches: silty clay H3-39 to 79 inches: silt loam or Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.20 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Se Available water storage in profile: Moderate (about 6.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B Hydric soil rating: No 15 irr. Custom Soil Resource Report 27C—Elioak loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: kb8z Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Elioak and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Elioak Setting it Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across-slope shape: Convex Parent material: Residuum weathered from mica schist Typical profile H1 -0 to 8 inches: loam H2-8 to 39 inches: silty clay H3-39 to 79 inches: silt loam Yr Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: More than 80 inches to Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.20 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 6.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No it 16 Custom Soil Resource Report II 27D—Elioak loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: kb90 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Elioak and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Elioak Setting i`r Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfuve Down-slope shape: Convex lip Across-slope shape: Convex Parent material: Residuum weathered from mica schist it Typical profile H1 -0 to 8 inches: loam H2-8 to 39 inches: silty clay H3-39 to 79 inches: silt loam it Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water(Ksat): Moderately high to it high (0.20 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Moderate (about 6.6 inches) Interpretive groups iro Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B iw Hydric soil rating: No r i. 17 imp iir Custom Soil Resource Report IYr tir 28D3—Elioak clay loam, 15 to 25 percent slopes, severely eroded Map Unit Setting National map unit symbol: kb92 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Elioak and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. rrr Description of Elioak Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across-slope shape: Convex Parent material: Residuum weathered from mica schist Typical profile H1 -0 to 8 inches: clay loam H2-8 to 39 inches: silty clay H3-39 to 79 inches: silt loam it Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.20 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low(about 6.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Hydric soil rating: No 18 Custom Soil Resource Report fir 34B—Glenelg loam, 2 to 7 percent slopes iMr Map Unit Setting National map unit symbol: kb9k Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: All areas are prime farmland t"" Map Unit Composition Glenelg and similar soils: 90 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Glenelg Setting w Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across-slope shape: Convex Parent material: Residuum weathered from mica schist fE Typical profile H1 -0to8inches: loam H2-8 to 28 inches: silty clay loam H3-28 to 80 inches: loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches ire Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None i,,, Frequency of ponding: None Available water storage in profile: High (about 9.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B w► Hydric soil rating: No iwr 19 ir. Custom Soil Resource Report 34C—Glenelg loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: kb9l Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Glenelg and similar soils: 85 percent Estimates are based on observations, descriptions, and transects of the mapunit. irw Description of Glenelg Setting ir. Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across-slope shape: Convex Parent material: Residuum weathered from mica schist w Typical profile H1 -0 to 8 inches: loam H2-8 to 28 inches: silty clay loam H3-28 to 80 inches: loam it Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: More than 80 inches t" Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None irr Frequency of ponding: None Available water storage in profile: High (about 9.7 inches) Interpretive groups i• Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Hydric soil rating: No tak �t. 20 ir. Custom Soil Resource Report 34D—Glenelg loam, 15 to 25 percent slopes r■ Map Unit Setting National map unit symbol: kb9m Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Farmland of statewide importance a"' Map Unit Composition Glenelg and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Eft Description of Glenelg Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across-slope shape: Convex Parent material: Residuum weathered from mica schist Typical profile H1 -0 to 8 inches: loam H2-8 to 28 inches: silty clay loam H3-28 to 80 inches: loam is Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: High Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: High (about 9.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B ,1i. Hydric soil rating: No Ir 21 Custom Soil Resource Report gut 39D—Hazel loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: kbb3 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Hazel and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Hazel Setting Landform: Hilislopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across-slope shape: Convex Parent material: Residuum weathered from graywacke sandstone and mica schist Typical profile H1 -0 to 10 inches: loam H2- 10 to 20 inches: loam H3-20 to 30 inches: channery loam 11 H4-30 to 79 inches: bedrock Properties and qualities Slope: 15 to 25 percent ire Depth to restrictive feature: 20 to 40 inches to lithic bedrock Natural drainage class: Excessively drained Runoff class: Medium Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.20 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low(about 4.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No rlw 22 r• Custom Soil Resource Report i~ 39E—Hazel loam, 25 to 45 percent slopes Map Unit Setting National map unit symbol: kbb4 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Hazel and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. tit Description of Hazel Setting r Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down-slope shape: Convex Across-slope shape: Convex Parent material: Residuum weathered from graywacke sandstone and mica schist Typical profile H1 -0 to 10 inches: loam H2- 10 to 20 inches: loam H3-20 to 30 inches: channery loam H4-30 to 79 inches: bedrock Properties and qualities Slope: 25 to 45 percent Depth to restrictive feature: 20 to 40 inches to lithic bedrock Natural drainage class: Excessively drained Runoff class: Medium Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.20 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low(about 4.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: B I"" Hydric soil rating: No 23 Custom Soil Resource Report 76—Riverview loam Map Unit Setting National map unit symbol: kbf6 Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Prime farmland if protected from flooding or not frequently flooded during the growing season iik Map Unit Composition Riverview and similar soils: 75 percent i„ Minor components: 3 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Riverview Setting Landform: Flood plains ire Down-slope shape: Linear Across-slope shape: Linear Parent material: Alluvium derived from igneous rock Typical profile H1 -0 to 12 inches: loam H2- 12 to 35 inches: silt loam H3-35 to 79 inches: silt loam Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: About 36 to 60 inches Frequency of flooding: Occasional Frequency of ponding: None Available water storage in profile: High (about 9.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2w Hydrologic Soil Group: B Hydric soil rating: No S Minor Components Wehadkee so Percent of map unit: 3 percent Landform: Flood plains Down-slope shape: Linear 24 Custom Soil Resource Report Across-slope shape: Linear Hydric soil rating: Yes it 83—Toccoa fine sandy loam Map Unit Setting National map unit symbol: kbfn Mean annual precipitation: 25 to 65 inches Lit Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Prime farmland if protected from flooding or not frequently flooded during the growing season lot Map Unit Composition Toccoa and similar soils: 85 percent Minor components: 3 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Toccoa is Setting Landform: Flood plains Down-slope shape: Linear Across-slope shape: Linear Parent material: Alluvium derived from igneous rock Typical profile H1 -0 to 9 inches: fine sandy loam H2-9 to 79 inches: sandy loam Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water(Ksat): High (1.98 to 5.95 in/hr) rA Depth to water table: About 36 to 60 inches Frequency of flooding: Frequent Frequency of ponding: None Available water storage in profile: Moderate (about 6.6 inches) Interpretive groups Land capability classification (irrigated): None specified its Land capability classification (nonirrigated): 2w Hydrologic Soil Group: A Hydric soil rating: No rtir 25 4 Custom Soil Resource Report Minor Components Wehadkee Percent of map unit: 3 percent Landform: Flood plains Down-slope shape: Linear Across-slope shape: Linear Hydric soil rating: Yes 95—Wehadkee silt loam Map Unit Setting National map unit symbol: kbgd Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Wehadkee and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. a Description of Wehadkee Setting Landform: Flood plains Down-slope shape: Linear Across-slope shape: Linear Parent material: Alluvium derived from igneous rock Typical profile H1 -0 to 10 inches: silt loam H2- 10 to 52 inches: silty clay loam H3-52 to 79 inches: sandy loam Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Poorly drained Runoff class: Very high w Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table: About 0 to 30 inches Frequency of flooding: Occasional Frequency of ponding: None Available water storage in profile: High (about 11.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4w 26 r"' Custom Soil Resource Report i,, Hydrologic Soil Group: B/D Hydric soil rating: Yes 96B—Worsham loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: kbgf Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost-free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Worsham and similar soils: 75 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Worsham Setting Landform: Drainageways Landform position (two-dimensional): Footslope Landform position (three-dimensional): Head slope, tread Down-slope shape: Concave Across-slope shape: Convex Parent material: Colluvium derived from igneous rock Typical profile H1 -0 to 9 inches: loam H2-9 to 54 inches: clay H3-54 to 79 inches: sandy clay loam Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Poorly drained Runoff class: Very high Capacity of the most limiting layer to transmit water(Ksat): Very low to moderately low(0.00 to 0.06 in/hr) Depth to water table: About 0 to 12 inches Frequency of flooding: None Frequency of ponding: None tor Available water storage in profile: Moderate (about 8.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4w Hydrologic Soil Group: D Hydric soil rating: Yes r 27 fir. References American Association of State Highway and Transportation Officials(AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes.ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. lit Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. r Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nrcs.usda.gov/wps/portal/ nres/detail/national/soils/?cid=nres 142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepasture/?cid=stelprdb1043084 28 • Custom Soil Resource Report United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres 142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=nres142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land lis capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf II. is its lir 29 ir. ti. 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R R; T �cl) ��) %� (f) ------ 0 I REVISIONS REV DATE COMMENT BY - . - - I I* -- KNOW WHAT'S BELOW ALWAYS CALL 811 BEFORE YOU DIG It's fast. It's free. It's the law. I NOT APPROVED FOR F' PROJECT INI V1 52000 " DRAWN BY: SFS CHECKED BY: DRH DATE: 1/10/17 SCALE: 1 "=200' 1 CAD I.D.: HAO,f " PROJECT: I OVERALL SWM PLAN us) life I 5 "I, I LOCATION OF SITE ROUTE 29 SEMINOLE TRAIL RD AND STATE ROUTE 643 POLO GROUNDS ROAD CHARLOTTESVILLE ALBEMARLE COUNTY, VA I F, 'I 0 IBOHLEIR: 22636 DAVIS DRIVE, SUITE 250 STERLING, VIRGINIA 20164 Phone: (703) 709-9500 Fax: (703) 709-9501 %. ---.00 � - -- - � I I p0m - , � A, 11 V. I - ) DANIEL R. HINES .0 Lic. No. 043176 *A 0 , M, R. - , , I N. .0 F SHEET TITLE: -I PRE- DRAINAGE SHEET NUMBER: I � - ) it i`. Figure 5 Post Development Drainage Area Map POI 14AI WET POND', 0� 0 H:I15N1520001DRAWINGSIEXHIBITSIXH - POND DRAINAGE EXHIBI I1152000XHO.DWG PRINTED BY: ABAXTER 7.31.17 @ 1:36 PM LAST SAVED BY: ABAXTER LEGEND O POINT OF INTEREST DRAINAGE AREA BOUNDARY - - - EXISTING WETLANDS BOUNDARY —tin im me 100 YR FEMA FLOODPLAIN ' 00PROPOSED CONTOUR --------- EXISTING EXISTING CONTOUR EXISTING TREELINE 200 L ✓ 50 1 7 f d 1'! l+��l! !r ltl, l ✓/✓d 1 f`! '`'i 'd fd`✓d o: r- "_,` d\ may' / r i f d e j.+ ✓ ',zl/✓d>J`iai'"_.. 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It's the law. NOT APPROVED FOR CONSTRUCTION PROJECT No.: V152000 DRAWN BY: SFS CHECKED BY: DRH DATE: 1/10/17 SCALE: 1 "=200' CAD I.D.: X0 PROJECT: OVERALL SWIG ]ALAN FOR BROOKHI LL LOCATION OF SITE ROUTE 29 SEMINOLE TRAIL RD AND STATE ROUTE 643 POLO GROUNDS ROAD CHARLOTTESVILLE ALBEMARLE COUNTY, VA TI BOHLER ENGINEERING 22636 DAVIS DRIVE, SUITE 250 STERLING„ VIRGINIA 20164 Phone: (703) 709-9500 Fax: (703)709-9501 VA@BohlerEng.com f p►,►.TH 0,0 ``i V DANIEL R. HINES .p Lic. No. 043176 'AO 4 �SS�aNA4��Gr �. SHEET TITLE: POST- DEVELOPMENT OVERALL L DRAINAGE SHEET NUMBER: in rr Ilrr rr Figure 6 a. 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I / zo Y23LLgt REFERENCES: • TOPOGRAPHY WAS COMPILED FROM SURVEY BY LINCOLN SURVEYING o a AND BELL LAND SURVEYS, JANUARY 2015. �Cw :ioowo • BOUNDARY INFORMATION WAS COMPILED BY LINCOLN SURVEYING ON ® G o a8 , ' MARCH 1, 2015 .Wl aw'�wwwi $ � m a • SUPPLE MENTAL TOPOGRAPHY BY ROUDABUSH GALE AND ASSOCIATES .... j ... i MARCH 201 NUMBER:PROJECT h < DATED: OCTOBER 16, 2016 � - REVISIONS • WETLANDS 8 WATERS OF THE U.S. IMPACT MAP, BROOKHILL, PREPARED BY: TNT ENVIRONMENTAL REV DATE COMMENT DATED: 7/6/16 1 ]/31/1] PER COUNTY COMMENTS PHHASING: 2 9/27/31 FOR APP OVAL THE CONSTRUCTION OF THIS PROJECT MUST FOLLOW THE PHASING 3 10/20/17 \`\ REQUIREMENTS, SHOWN BELOW, SET FORTH IN THE APPROVED ZONING MAP AMENDMENT ZMA20170D7 CODE OF DEVELOPMENT, DATED JUNE 15, 390 - 2015 LAST REVISED ON JUNE 27, 2016. GREENWAY/STREAM BUFFER 'THE LAND DISTURBANCE AND GRADING FOR BROOKHILL WILL OCCUR IN PHASES TO LIMIT THE AMOUNT OF LAND DISTURBANCE ATONE TIME AND TO AVOID MASS CLEARING AND GRADING OVER THE PROPERTY. THE `X`` `A 8 OOKHILL PROPERTY SHALL BE DEVELOPED WITHIN NO LESS THAN (4) PHASES. THE FIRST PHASE SHALL BE LIMITED TO 80 ACRES OF -' DISTURBANCE, INCLUSIVE ROADWAY IMPROVEMENTS, INSTALLATION OF ® OPEN SPACE BUFFER UTILITIES, AND CONSTRUCTION OF THE STORMWATER MANAGEMENT AND -• EROSION AND SEDIMENT CONTROL FACILITIES FOR THE DISTURBED AREA _ AND PROOSED DEVELOPMENT WITHIN TME FIRST PHASE. THE REMAINING `- --'--------� s o PORTION OF THE DEVELOPMENT SHALL BE CONSTRUCTED WITHIN NO LESS THAN (3) PHASES. EACH OF THESE (3) PHASES SHALL BE LIMITED TO 60 - ACRES OF DISTURBANCE WITHIN THE PHASE. ALL DISTURBED AREAS PROPOSED IMPACT TO BUFFER AREA WITHIN A PHASE OF DEVELOPMENT, EXCLUSIVE OF ANY LOT UNDER CONSTRUCTION WITH A BUILDING PERMIT SHALL BE SEEDED AND STRAINED, PRIOR TO THE START OF THE NEXT PHASE OF DEVELOPMENT" SITE TABULATIONS: pla TOTAL SITE AREA:1277.50 AC. KNOW WHAT'S BELOW 02 ALWAYS CALL 811 ONSITE DISTURBED AREA: 1200.12 AC. BEFORE YOU DIG OFFSITE DISTURBED AREA: 15.15 AC. It. fast. 6afe IPethe Law. TOTAL DISTURBED AREA: 1205.27 AC. TOTAL OPEN SPACE: 177.38 AC NOT APPROVED FOR GRADING PLANS WILL BE FINALIZED AND SUBMITTED WITH CONSTRUCTION EACH BLOCK'S FINAL SITE PLAN IN ACCORDANCE WITH THE PROJECT No V152000 CODE OF DEVELOPMENT AND ALBEMARLE COUNTY DESIGN DRAWN BY: MEG STANDARDS. SITE LAYOUT, USES, BUFFER DISTURBANCES, CHECKED BY: RTY PERSERVED AND MANAGED SLOPES DISTURBANCES, DATE: 3/6/17 GREENWAY DISTURBANCES, AND GRADING SHOWN ON THIS SCALE: =200' EXHIBIT ARE APPROXIMATE AND CONCEPTUAL IN NATURE AND CAD I.D.: OTo 1 I _ SUBJECT TO CHANGE WITH FINAL ENGINEERING. LEGEND: — — — — — — — EXISTING CONTOUR PROPOSED CONTOUR BLOCK# BLOCK LABEL SECTION #1 SECTION LABEL SECTION BOUNDARY BLOCK BOUNDARY CD GREENWAY/STREAM BUFFER REVISIONS REV DATE COMMENT BY 1 ]/31/1] PER COUNTY COMMENTS DRH 2 9/27/31 FOR APP OVAL DRH 3 10/20/17 FOR APPROVAL DRH ENGINEERING 390 - GREENWAY/STREAM BUFFER 28 BLACKWELL PARK LANE, SUITE 201 WARRENTON, VIRGINIA 20186 `X`` `A STRAINED, PRIOR TO THE START OF THE NEXT PHASE OF DEVELOPMENT" SITE TABULATIONS: pla TOTAL SITE AREA:1277.50 AC. KNOW WHAT'S BELOW 02 ALWAYS CALL 811 ONSITE DISTURBED AREA: 1200.12 AC. BEFORE YOU DIG OFFSITE DISTURBED AREA: 15.15 AC. It. fast. 6afe IPethe Law. TOTAL DISTURBED AREA: 1205.27 AC. TOTAL OPEN SPACE: 177.38 AC NOT APPROVED FOR GRADING PLANS WILL BE FINALIZED AND SUBMITTED WITH CONSTRUCTION EACH BLOCK'S FINAL SITE PLAN IN ACCORDANCE WITH THE PROJECT No V152000 CODE OF DEVELOPMENT AND ALBEMARLE COUNTY DESIGN DRAWN BY: MEG STANDARDS. SITE LAYOUT, USES, BUFFER DISTURBANCES, CHECKED BY: RTY PERSERVED AND MANAGED SLOPES DISTURBANCES, DATE: 3/6/17 GREENWAY DISTURBANCES, AND GRADING SHOWN ON THIS SCALE: =200' EXHIBIT ARE APPROXIMATE AND CONCEPTUAL IN NATURE AND CAD I.D.: OTo 1 I _ SUBJECT TO CHANGE WITH FINAL ENGINEERING. LEGEND: — — — — — — — EXISTING CONTOUR PROPOSED CONTOUR BLOCK# BLOCK LABEL SECTION #1 SECTION LABEL SECTION BOUNDARY BLOCK BOUNDARY CD GREENWAY/STREAM BUFFER OGRA� I � � =_ �-- ;Scca%'wv 1 •-++D _�-� ---------- - --- _ — — �_ PROP E��,�T PROPOSED 20' HISTORIC SITE BUFFER — — — — — — — — ING PLAN ______ _ _ __ _ __ _ _ _ _ _-_ _ _ HEFT NUMBER. ------------ +g[e _ __ ___ _ __ ___ _ _ , ' 41.1. Il.' IO? Lam' � Ua;e ( ,1 / ------------------------ ----- — ----- -- _ -, � P �0'-/I� o00 4 z c;; — __ -� /.1 ? , , .__.. ls_,- '-" '(✓AR/ABLE : , ; I .B l P. 25I 3l1 P. 552 KW.P D.B. 220 P. 159 AB ` 1111 I 1 zoo IN so o zoo r=zoo' BOUNDARY �O �' �' �' �' FEMA FLOODWAY (ECFV. 360.00) 'O ENGINEERING 390 - GREENWAY/STREAM BUFFER 28 BLACKWELL PARK LANE, SUITE 201 WARRENTON, VIRGINIA 20186 `X`` `A Phone: (540)349-4500 `\\IF. ' ;�J ® OPEN SPACE BUFFER Fax' (540) 349-0321 :.; VA@Boh/erEng.com TH O }:1 } c5\ � WETLANDS s o PROPOSED IMPACT TO BUFFER AREA l , PROPOSED IMPACT TO GREENWAY o Lic. o. 043176 PROPOSED IMPACT TO PRESERVED SSS/ONAL�aG` rr:' •', SLOPE PROPOSED IMPACT TO MANAGED SHEET TITLE = SLOPE OGRA� I � � =_ �-- ;Scca%'wv 1 •-++D _�-� ---------- - --- _ — — �_ PROP E��,�T PROPOSED 20' HISTORIC SITE BUFFER — — — — — — — — ING PLAN ______ _ _ __ _ __ _ _ _ _ _-_ _ _ HEFT NUMBER. ------------ +g[e _ __ ___ _ __ ___ _ _ , ' 41.1. Il.' IO? Lam' � Ua;e ( ,1 / ------------------------ ----- — ----- -- _ -, � P �0'-/I� o00 4 z c;; — __ -� /.1 ? , , .__.. ls_,- '-" '(✓AR/ABLE : , ; I .B l P. 25I 3l1 P. 552 KW.P D.B. 220 P. 159 AB ` 1111 I 1 zoo IN so o zoo r=zoo' +a. irk it Figure 8 Critical Area Map if th, n I f- I /fill 61 f X fit v . . . . . . f Ilk if I 1,111�1!1 I" X its it lip j sil; "'0 '\fit I_ 41 I it �Jlil \If luu VEGETX BUFFER Et -�Z ---,I Z�, Vk, If( A", J, I �j l f /It I 1 111 if lW ',I I` /30'NATURAL BUFFER BL SECTION _.BL CK 9 t DEVELOPMENT AREA(TYP. All Y 1- If :EN SPACE P.) ft I CRIT "TBLOCK 4B Jr 11(Z c 30'NATURAL BUFFER rr, "I'll [fill fill I 1z L4 �`Q, - ��A­, mg, kN\, A C ZI /,1//v 1" OPEN SPACE _<1 I 7 (TYP.) SLOI ES AREA( yP, /I (TYP.) DEVELOPMEN AIL k Is ,(I Y FJ,) V, N TION 4' CK 15'�%` re� �v -,\v 17 ... .... GREENWAY ------ P.) OPEN SPACE V (TYP I'j I k 541 r - 3LOCK 14;-- 30'NATURAL OPEN SPACE _,P�FFER LOCK 12 It 111i"Xii, (TYP.) ------ I I—— AREA(TYP -SECTION 3 "o, ;-A-�, \x '"X. 100 YR F ITLOODPLAI j, E CE SECTION 5 P) 'Ji v 7, OPEN SPAC ,Q, ji If if if I - , 1� B k :1 All N__ EXISTING ARCr1AIU WOODLAND CAMPSITE 4DEVELOPME 7 AREA (TYP, AREA TO BE PRESER"i "v L OCK 4 Jj N -111 T_T4_:N-_ffq F r DEVELORYIE-141 BLOCK 5 (TYP) AR 7., B _OCK 1,+ BLOCK _44 SECT -ION 1' `\11 CRITICAL -j "'g LOPES DEV Jill -T7-r W, J, i B—L 0 C_ I K �2 tk Jill - If y ��BLOCKI'7i"` (TYP.) I t -GREENWAY is, pa U41 U f�,,r REENWAY :LOPM MF\r-A IT 01"bif SPACE 4 1# 30 NATURAL G BUFFER X [pf' i; If 'it ',is I If/ !is is Y mj) I V r1r_ -6,y VEGETATIVE PIC" - .5 BUFF V L 0. '' 0 K .6 L)LOCK 19� ,B EXISTING BROOK HILL HUUbL ru REMAIN T P NSP if, Is ii )PMENT 71 P, jililil ki I r I T, -ji ::is �2 AREA (TYP ig fui;; TICAL 4 fju /�_EX. 100 YR FEMA 0 t-LUUUtLAlN (TYP.) '�IOLOPES kl\ 0 Pis _NWAY 100 a __e_�" 00 0 00 00 /0 — W" / A I 11"I"'l iisAM -L40? LEGEND i, J,'I I'l 1, if GREENWAY BOUNDARY "J" 9, ------ —loo j -bLUU 0 100 JjV )9— EXISTING 100 YR FLOODPLAIN DEVELOPMENT 11, P%'-, Ni"i i, V is J � i, " " z I =7-7=1 EXISTING WETLANDS AREA(TY 31 HALT 39V r Jill i WIL PROPOSED OPEN SPACE fm I , W-011 Wd ili,V "I'l 30'NATURAL ENCOMPASSING THE BROOK HILL FFER PARCEL WITHIN BROOK HILL fvv _�, Pmp. BU 6�, HISTORIC HOUSE AND THE 19TH T' Jl� CENTURY COMPONENTS OF BROOK HILL Z is _y /00 )�p MANAGED SLOPES W ,It ASPH�[T C, 38 iii, TRAIL r 0 mom -j\_ J PRESERVED SL 4 ------------------ _-, 'I, – __: OPES - - - - - - -- - - - - -- - - - - - - jk�i j 30'NATURAL ------ J-1 v, -BUFFER if 9,1( VEGETATIVE BUFFER 4, r c ASPHALT TRAIL 100 rR— loo SECTION BOUNDARY ASPHALT TRAIL BLOCK BOUNDARY ------------ OPEN SPACE 150 75 37.5 0 150 J� if Off if 11.1 N(TYP.) A, ------------- I "=I 50' C:kUSERS\ABAXTFR\APPDATAIOCAL�TEMPIACPUBLISH 13836W1 52000XRI.DWG PRINTED BY: ABAXTER 8.01.17 @ 11:53 AM LAST SAVED BY: ASAXTER p 1z < z 07 10y - 0 LL -f < (of) Z � (-) P, + * + + + 9 Es �4 LIj 0 z <�C� Z< z LL >_ ag I< � 2� 2< 0 6 Df b LT LT, 7E It Is) LLJI S LrL lul) lz + z < < > Z LL C,: LL, LL, :I:,, LZLI .0 LZU UZI LZLI P4 XCE �� <1 H_ RE V�l S, I ONS REV DATE COMMENT BY KNOW WHAT'S BELOW ALWAYS CALL 811 BEFORE YOU DIG It's fast. It's firee. It's the law. NOT APPROVED FOR CONSTRUCTION PROJECT No.: VI 52000 DRAWN BY: EEN CHECKED BY: RTY DATE� 7/31117 SCALE: AS NOTED1"=30' \.CAD I. D.: GPO PROJECT: ROAD IMPROVEMENT PLAN FOR POLO GROUNDS ROAD AND BROOMILL SECTION I LOCATION OF SITE ROUTE 29 SEMINOLE TRAIL RD AND STATE ROUTE 643 POLO GROUNDS ROAD CHARLOTTESVILLE ALBEMARLE COUNTY, VA TI BIGHLER ENGINEERING 28 BLACKWELL PARK LANE, SUITE 201 WARRENTON, VIRGINIA 20186 Phone: (540) 349-4500 Fax: (540) 349-0321 VA@BohlerEng.com � A'A � - TH 6L - 1*� DANIEL R. HINES Lic� No. 043176 7/31/17 L SHEET TITLE: CRITICAL AREA MAP SHEET NUMBER: 3 irr Appendix B I. Tables ire se ri Yrr Table 1 VRRNI Treatment Summary II ime 4 w. as - 7o < < -r to -I -I -I u+ N 3 3 c H — N p . m \ m 2 2 2 ID 2 2 5 N .0 :i y :: ID m I. in 42 e3i d d m d m d o 0 ... xi x ID m 3 H m m A V 3 2 c o v a a 3 < g. °° d < a 3 3 m ° a 0 Or. oo co r O O 3 O w W C .0 3 co O y W Q 3 N -1 m -I -1 a a = _ a 1, i < O. n c 2 A O. a 3. ! r .Ne 7o p W A .. r' O a. d o m d 0, W la m 0 .. to C . 3 3 °; - m m 3 c a m .ro c^. c 3 v1 2 m o . N = v+ 3 v o M. O O 3 A c — (-1 C d N �'. 3 — '° 3 n 00 a 'c{ 3 D D c 3 g° 3 a 0 a 8 z5. z 2 m a d w a c o -0 m _ c<` ua 10 a to N d. - - d - o O. r o In _. 2 ell 0 m 2 F Nis, A 1-' 0 A A i-' A 10 V 0 co p 0 O O O D .�. m v V F+ V N 01 10 O. < O 00 O 01 0o u, Co up A F+ O1 O O O N• N RO 0 CO 1"' 9 illi . IA g A w I 0 0 O O313 • 03 Oo O N on Oir 2. 1O VI in N I ID 1 v to I m a illn Io 0 0 ^ inA 0 0 0 0 .m. i o 0 o N 5 I m a. N 1 I 5 m 'llij W C � O O O 0 b 3 o g o ° a I m 1 g I a N N N I V co co O O O '3' N Ol I 1 0.. I oo tO N 1 O I d We 1 1 1 1 1 is1 1 I I I I 1 1 ma AnII a iw iw z v VY 3 0 C t- , d m m d ID p N A I 6 G d ISD ID m W H -I N ID C C n b C a 3 D � n n I3D N t d IID iii mto n to 91 DI A N Fr' 7 O — d N D . c < < 3 3 — 3 ;.^- --7 DI 3 aim n ID C C 3 3 DI ill CD N D N N V1 D • W ‘" D 8 O o o D OW T p • O V V N G ill �' w D CC 0 0 0 4+ DD O O co. illi 03 I" p in Na o 0 V 0 :I o D in o 0 o D co co g o 0 O r, a i So T 0 c O A G b O O v G i. A 3 .--• to O O to o a to 0 0 c a. 13 N _' • m 0 0 0. OI la VD m O to tt'o LO - • G o iD 00• " m S 0 0 0 m m m r IV+ A "I V O O Q V t+ w V Co co N in Y N V V 0 0l O 0 0 to M iMill ill all M Io MI MN 0gfgJ2 § 73On U ° ND 1= -1 E. E 7 k � 2 S. r- 17; % 2 H 7 - a o | a E • ■ z s m + - ; a ; g � 1 _ | i m ° tea § § . ; s0 •• � al 2 ¢ . i . 3 _ ( - i'i_ _ ! 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Y N 2 01 V 7 Y y W in 2 lit Y N n 5 Z ` -els 21 r a. 3 {~y M o a 0 < w r 17 a a 4 . 2 d 3 a n 0 2 in D m m70 N ef N A d 3 A d C C d O Q N O N N Y n 2 2 N < 7 y1 O 'Y 2 N in o o a P. a 0 a 2 3 3 D = d i r n p mz. s ? m' m 9 v d d N_ Y ? Q N N . It o. O. n g 3 mCD fn in 0 o r. w 0 C d v Ma • Y' o 03 N O O 01 •W n 6 O 0 o yDN 00 b O O V W N D & O O O O N Y C tin s '0? 3 V w q N O O O G 2. N O O Nz G C iiis N w N r v2 ill E 3 m o 0 o N 01 N w o 0 o G V A Y 3 N5 7 <3 i d 0 ..I xi d C 0 ha • r ( n w d o 0 0 7i 3 8 8 ^ Y O O O N soa a 3 'o • 3 g s 3 ii 7 C m 3 a O 0 3 a Y i 01 W .^Y-. O O o O -. ID Nr m d a -I 2. MI W to i 3 T 01 1.0 V .'1 N a ill 4 a IID- r. c N',.-.; m v w' iii A a Ill .Y. 0 t 7 N is n o A3 Q Y iis it r. iiii cr = - - o J ■ , j� � � \ §ri {CY k in 21 E gir& a � k � \ k L a0. 7 I m e _3. Z i . 3 \ . � •3 \ to c » � � ; // 3 « ) o to a » 0 • I . Z L . n ■ 43. Cr, 2 > } w to tn - to a� o o - big iv5. » 2J a ill f.0i. V, o - a ono 0 B iill 2 2en ■ o o § r 41 f ■ " „ `! 5 iill % 3.' £ J oo k } { B i 0 0 0 , , lila\ � � 3 } C 8. \ on $\ jj (/ §/ n.ill -1 a o. § g J f lo w Al o f I ) K � 3 61 9J rn ilia 3 I3 \ } kf § NM i. Q 2 • Q 2 o o to C 3' 3 o E O l .� d , Y d m g' ^ A v A � m a d V2Vo c 3 1" s d I Z 3. r, n 5 01 r r a. 3 w 2 q - m c a s A 000 W y D Y f1 S N a C 1 N m O DI C 7 N 70, a :4 IV N m 3 m C C M f1 y • O 7 9 n a co m ._z, a m < g n D 1e 10 y n r Q N i a 1 a N 3 m A Ti 3 D D r r 90 7p, m ao m 7 ? N Y IA X a O. 1.1' N < < "" a A co T N 7 7 -. O N 01 0) D P -4. g' ` x n D D N? .. D p 0 iiii 01 n „, ON IIID .IND N 1.- ' N n' 0:W O O O N O O NtO V' 111 . D C. O O O ON Int Y l• D 0/ 3 0 �„. tV. Y i 0 N N N O yi 1.0 IO U' IA t. A 0 N n f1 ? O O O 2. N O 0 O O N N M N ID 01 A C O V io N A C O O O P O OWi N m O O o G N V ‘i. 3 N ` 7 1a �, Y A ; C Oo O OO a w 29 O O N 3 8 8 8 �° E a o 0 0 ° c . Y H q o3 . 3 3 m m ET 2 o y 3 a Y CD N T n N�e WW b IND I, o O it ✓ oo N .^Y.. O O O O O Y m ii r 1 .1°. d t kr 9 at b W ta Er ID 0 a o WW N NIO W Igra 7 ; O illii 3 E O j w 'm c o 3 m lig6 6 6 III' I X/i a3 ID PP of iu 7 <I N N N W Q _ C W W 1.0 m A Ol kill , A A d " �',.rt 7 C c c 3z A F a: 3 3 v a ['1 A m to d to d I im a a n n c1 OI in 1 in a z f o i f o i f e A m 1 C A 9 C gilt. F A QO O N I III if ? ,, M £ r. Z O O I n n 'I' a F. N IAl N N N N O 1-+ W 0 01 N W W A N IAJI A N N 01 D N .. O m 3 I X. - i 0 ad Q 1 N N O O1 O O !� Of un y I ...,i-,' 4.1-'' v 1,D LOP T 01 00 s v V N o r D I m 3 1 m s 13. Nil O I A or I i CO 0.1 04 V • • N • N • • A J 00 I IC N W N • 0, 1 0 01 C D I 1. P. ail 13 m 0/ J 3- 1 01 Fr I o v a S I N N N O O W O L W N U W 01 O1 -0 Obi Wcr, W N 1 N D 'm I m d O 1 0 1 i 3 1 .1 •N •N V • • V O• t7 A v 00 A W A A r N A tAO N O1 A N N D m I m 1 is 1 I iii 1 I km I 1 I I 4. I IN im it Table 2 Land Cover Summary Brookhill Development - Land Cover Summary Table Section 1 (Blocks 1,2,3,4,5,6,7,8,19) Land Cover Area(AC) CN Impervious Percentage Impervious Area(AC) "' Open Space 15.00 61 0% 0.00 Urban Density 19.00 85 b5. 12.35 Roads 6.50 98 100% 6.50 Commercial 11.50 92 85% 9.78 Single Family Homes 61.50 75 38% 23.37 Ponds 5.50 98 0% 0.00 Total Site 119.00 52.00 Section 2 (Blocks 9,10,11) Land Cover Area(AC) CN Impervious Percentage Impervious Area(AC) Open Space 15.00 61 0% 0.00 Urban Density - Roads 3.01 98 100% 3.01 Commercial - Single Family Homes 10.49 75 38% 3.99 Ponds 0.50 98 0% 0.00 Total Site 29.00 7.00 Section 3 (Blocks 12,13) Land Cover Area(AC) CN Impervious Percentage Impervious Area(AC) Open Space 7.50 61 0% 0.00 Urban Density Roads 4.25 98 100% 4.25 Commercial - - Single Family Homes 15.12 75 38% 5.75 Ponds 0.63 98 0% 0.00 Total Site 27.50 10.00 Section 4 (Blocks 14,15) Land Cover Area(AC) CN Impervious Percentage Impervious Area(AC) Open Space 7.50 61 0% 0.00 Urban Density Roads 4.67 98 100% 4.67 Commercial - Single Family Homes 16.00 75 38% 6.08 Ponds 0.83 98 0% 0.00 Total Site 29.00 10.75 Section .5 (Blocks 16,17,18) Land Cover Area(AC) CN Impervious Percentage Impervious Area(AC) Open Space 15.00 61 0% 0.00 Urban Density - Roads 12.47 98 100% 12.47 Commercial Single Family Homes 43.50 75 38% 16.53 Ponds 2.03 98 0% 0 00 Total Site 73.00 29.00 Table 3 Quantity Compliance Summary Ul Ul A A W w 0 ,..,,---' yo x V a- Ul A w N I--' ti O100 D CO D CO D �' 1' In ro n Ui U'7 Ul Ul Ui Ul A CO NJ I"I" II" I" I-. I-. I-. - I-. I--. t-" I--. .e• O 0 4* L.I-' I-. 1--' I"� -I 1--� N N W �, v rn N F, �, A NJ O A V ---.4 w V AA A 0 v CO J Cr) 00 00 Ui W t� 00 W V J7 N 1.0 v 4* A NJ I-. I" N Ul w w w N A N I H Ln A 0 N w N X C N 4. 00 'co h-+ U'1 U' V N Q1 Cr, :-...t 1•--� U7 pl N I--' 2< rn— h-` w V Ui w w 00 Ol lU 1.- 00 O NJ NJ l0 Ul. U1 Ul up _ o act -o ro O J x- q 2. N I--. N I-. N V I. NI-. I-a N d :N F-+ v CO lD I.0pl O0 O ALO •V OD A U7 F-). k.0w 1.0N 0 a0 ,f- r, en Ln A N A w I" A 00 OO V V 40. UJ N W w -< CD N., O '^` Cr) w i-, CO NJ 3l O 00 Ul A W (ll w w l0 A n {{ 17 h. \ d t✓ Ul O 000000 N O O N A O N '..I 1--. w O N N t0 I" I--+ . h' to A A i0 J en O LO A tv In NJ I-, -< - :C Ql N 00 N 00 NJ 01 ID U) A I- A CO 07 00 Ci V 00 0 N 1 )o a 1 dn A- 0 '� n Di Uiw F,, N Ol IF'',_, W I" V A N Ui 00 N Ql 074 w co O 0 ((1) I-, 00 W 00 Lo A O0 O In F-t. lD w N 1p . Lu l0VI LID NJ N Ul A I" N 00 00 A V U1 VI N CT N l0 y. W NJ NJ N en Z m m rn m m m m m m Z Z m s O 3 O m 3 7 7 3 = a) V7 1--� 0 CD fp r0 m fD fD M rD rD (/1 V1 j N (!1 0 VI VI ro o rD o m Oil 00 OU 0 < 00 00 S 3" I"' m S S �' 7 ro tD o I'' - FD (p c T N Oil V7 _'-I,., O (n W CO CO CO 00 CO CO CO CO n• -r*+, O ON �+, -�+—, p _n W - O • D) a) co N D) n) Cu D) G) O < O O z' < O o -j Z. p p v .p r 3 T1 n n n n n n n n n -n T n irj N (D CD (D rp (D (D (D r0 p rrei 7 -1 ^ ,-r n O 0 p O n 1- n 1- n I--+ 3 F-- h-` N 1-� r-- 1-� N 1--� -. o O 0 0 90 m 2< o 0 0 0 0 0 0 0 0 m 9 m O On111 V)NVI a, * OOOOOO O N H ro rr ,-' ,--. -, .+ , -- n M 2 fD n m fD - MI - ^" 0 CO CO CO 00 CO CO CO CO CO —I, —I, '* O �+ -1, "" O - = 00 0 S Q. O o 7 N ro ro CD N (D rD m CD O p o p- p O 7 O O (D Oo 0 CD -0 -0 -0 -0 v -D -0 -0 -0 -0 m -0 v 0 ft) rD (D fD N (D M ID rD 0 0- 0 _L2 i`. Table 4 Energy Balance Summary a aim M v 73 -V "V l'•3000) m __ fJa) 7J0 - 0u)0 < , n0 ? -6• l' Er c . D x o '� W n o O = ID. X 0 o < '7, , C m:< m 730 . 0 P> H m HIHI < < � 0 m � o a ^ � v3 H al — PO N,... o C 3 3 3 -p 3 2 .1.— ‹ . < ? , r. CDD^ � p 0 Ma O N v CD tD � v1 �. . W N % y •• < • 0 'U '3 -< o P _ D -• OO N' P -A W _< Ero irr a o o CD — — CG,.O —aCO - CD CO -' ocD CD o � O� N-. y+ O N wCD � O N NCD -4 CD ' G1 3 - -� CD "coc ' ' 'I _ W Ivo CD v N O O NNO 00 NCAO -A 0 3 < < co O O OAODw W O O OGJp � 0 < - Nq1 3 y Co A :..4 N O O ? W 03 W V CD Da, fJov, o co CC o O N _ 0 0 -< _ 3 < � N � CD _, N CCW CO_ O .41. COo o N W -4 iai KOX c'N 11) Cn ? O � O W N M N 010XacrZ 7 CD G •► N -< O P � CjO 00 W 00 — ~' O CD N ' CD V OD fr Cr am O CDN CO N Cn V A N0000 CO W COO . N (D o co n � � N P P co v, coo � o0 w � 0 � � = co < .+ CD _. _a O OD A 00 N -, Cr O W -a - CU O� y V O A V O C)1 CJ1 co N 0 - - In N r.Je "CS •• ' 0 � O O � � O V OO A � O (ntt ca - CD < N O w A CO CD 0) 0 CO OO 0 CD (71 co W lial , CD C t C7 fl1 - -< O O V V O O O DODO O -4 Pte, CD CD O O W Co 00 O O U1 COT O A > a '0 O CO OCnO OCD ONCo N D /q�� �l < \ d -< 0 P CID CDO OO — aDO O — CD O -A A 00 ( ZA 00 - 0 0 � 6; in 4*' fir) V 0 N O O 0 0 CO CO CD N b J 111 -< O O V V 00 O -• V O O O CD b A V al CO Cb -. W O -• CjA uv1 V U1 -% -+ O O CA CO CO CO CA all -< OO CO CAD CD OO -+ CnC O —& CD ..-u _ V _ _ _ cn CA Cn 0 0 4 4• 0000 000OCOOOWO W CT We af o i D lJO CD cn -u B 3 c o < 3 j N C CD CD 'd CD 0 3 .O. • ZD T CD CD o Ira 3 o co o m - :T IV a m C A N Cl) O .. la im is Yr ri Table 5 Water Quality Summary rr Appendix C 1. Approved Plan ZMA 2015-007 2. Approved CLOMR a Brookhill Stormwater Quality Summary Table WM Anticipated Percent of Phoshorus Removal Phoshorus Removal Total Section Block SWM Type of FacilityAmount of Offsite FacilityID yp proposed w/master plan achieved w/approved Plan# Develoment Credits Purchased (Ib/yr) plan(Ib/yr) Offsite (Ib/yr) "" Credits(%) Nutrient Offset 1 - 6.8 3.87% Credits Sheet flow to 1 74 - Open Space 1 - Infiltration 21.71 1 Manufactured 2.62 Devices 1 2 PO1 4 Wet Pond 6.77 1 7 PO1 7 Wet Pond 8.11 1 8B POI 10 Wet Pond 7.22 1 8A POI 11 Wet Pond 9.68 Section 1 Treatment Total 65.85 Nutrient Offset 2 - 6.8 3.87% Credits Sheet flow to 2 1.67 Open Space 2 11 POI 12 Wet Pond 8.06 Section 2 Treatment Total 9.73 Nutrient Offset 3 6.8 3.87% Credits 3 Sheet flow to Open Space 5.95 3 12 POI 13 A Wet Pond 9.13 Section 3 Treatment Total 15.08 4 - Credits Nutrient Offset 6.8 3.87% Sheet flow to 4 0 04 - Open Space 4 14 POI 13 8 Wet Pond 14.05 Section 4 Treatment Total 14.09 Nutrient Offset 5 6.8 3.87% Credits 5 - Grass Channel 2.10 +r5 Sheet Flow to Open Space 1.43 5 18 PO1 14 A Wet Pond 4.81 5 18 PO1 14B Wet Pond 6.42 Aim5 16 PO1 15A Wet Pond 5.16 5 17 POI 158 Wet Pond 5.14 5 17 POI 16 Wet Pond 11.75 Section 5 Treatment Total 36.81 Overall Treatment Total 141.56 Overall Purchase Total 34 19.35% am Overall Development Total 175.56 Notes: 1.Even though we are currently only proposing to purchase 34 lb/yr or 19.35%,the total offsite credits available for purchase are 25%of the total 175.56 lb/yr so required for the development,or 43.89 lb/yr am or as a rim Yr ii Approved CLOMR I. ion f ito Glossary a. ll Y. Glossary: 1. Energy Balance: Energy Balance is an industry term referring to the equation specified in 9VAC25-870-66. B.3.A,which is used to satisfy the channel protection requirements of the Virginia Stormwater Management code. it ie 1�.