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HomeMy WebLinkAboutWPO201600007 Review Comments WPO VSMP 2018-10-26COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902-4596 Phone (434) 296-5832 Fax (434) 972-4126 VSMP Permit Plan Review Project title: Inglewood Terrace Project file number: WPO-2016-00007 Plan preparer: Shimp Engineering Owner or rep.: Brian Gillispie Plan received date: 1 February 2016 (Rev. 1) 16 May 2016 (Rev. 2) 2 August 2018 (Rev. 3) 19 September 2018 Date of comments: 22 February 2016 (Rev. 1) 21 June 2016 (Rev. 2) 31 August 2018 (Rev. 3) 26 October 2018 Reviewer: Matt Wentland County Code section 17-410 and Virginia Code §62.1-44.15:34 requires the VSMP authority to act on any VSMP permit by issuing a project approval or denial. This project is denied. The rationale is given in the comments below. The application may be resubmitted for approval if all of the items below are satisfactorily addressed. The VSMP application content requirements can be found in County Code section 17-401. A. Stormwater Pollution Prevention Plan (SWPPP) The SWPPP content requirements can be found in County Code section 17-405. A SWPPP must contain (1) a PPP, (2) an ESOP, (3) a SWMP, and (4) any TMDL measures necessary. No SWPPP was included with the submittal and needs to be provided. Comment not addressed. (Rev. 2) Comment addressed 2. (Rev. 2) Provide a signed certification with the SWPPP. (Rev. 3) Comment addressed B. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17-404. 1. The PPP appears to be acceptable at this time. C. Stormwater Management Plan (SWMP) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is disapproved, and the reasons are provided in the comments below. The stormwater management plan content requirements can be found in County Code section 17-403. 1. Show soil data on the plan. Comment addressed. Engineering Review Comments Page 2 of 5 2. Due to two conflicting stream studies, Staff requests that a third study be performed, either by a third party agreed upon by both the homeowners and the developer or by the US Army Corps of Engineers. This third study will determine whether or not a buffer will be placed on the parcels in question and on all parcels downstream of the site. Comment addressed. Include all necessary hydrologic and hydraulic analysis for the site, including the VRRM worksheet for Redevelopment and verification the channel leaving the site is adequate. Comment partially addressed. Include the Stormwater conveyance culvert on the LD-229 worksheet. STR-C3D to STR-C3 also appears to be entered incorrectly on the worksheet. The nutrient credits will need to be purchased before plan approval. Please contact Ana Kilmer for information on required documents and formatting. (Rev. 2) Please contact Ana Kilmer prior to purchasing the 1.16 lbs. of nutrient credits. 4. Verify that the pipe profiles are correct. B2 and B3 appear to be shown and labelled incorrectly on the profile view. The stub -out is not shown on C4. Comment not addressed. Drainage information has been removed from the plan. Please provide plan and profile information for the drainage system, including a drainage area map for the inlets. Provide details on the weirs/orifices for the detention system and show how the 60" and 72" pipes will be connecting to the MH-1s that are shown. (Rev. 2) Provide more details on the JB-1's, including the height of the boxes and the type of tower on each. It appears that both B2 and B3 are shown as being above grade, is this intended? (Rev. 3) Comment addressed More detail will be needed where A4 and C4 connect to the retaining wall. Comment partially addressed. Retaining wall/headwall designs will be needed before approval. A4 also does not appear to continue through to the lower wall on the plan sheets. (Rev. 2) Response noted. See Comment 9 below. 6. A2 has a 4' drop and a 90' turn. Provide a hydraulic profile to verify this will work during larger storms. Comment addressed. The curb cut on the turnaround is discharging runoff onto the fill slope. The slope will need to be protected from erosion. Comment partially addressed, the current grading shows a ridge in the middle of the swale. (Rev. 2) Comment not addressed, the turnaround (located above ST-1) is still showing a curb cut and hatching leading to the inlet. Provide more detail around the inlet as it currently appears the drainage will not be intercepted by the inlet. The top is also called out as 515.54 while the proposed 514 contour runs near the middle of the inlet and the 512 contour runs along the edge of the inlet, leaving A2 exposed. (Rev. 3) Comment addressed 8. Provide a Stormwater maintenance agreement for the site. Response noted. (Rev. 2) The agreement has been forwarded to Ana Kilmer. 9. Provide plans for the retaining wall and verification that there is no issue with the wall and wall foundation being submerged during storm events. It appears the 100yr storm event overtops the wall and runs into the buildings and the neighboring property. Comment partially addressed. Retaining wall plans will be required before approval as the Engineering Review Comments Page 3 of 5 travelway and townhome construction is dependent on the walls and to ensure that wall construction does not affect the neighboring property behind Lot 3. (Rev. 2) Response noted. Retaining wall designs will be needed prior to plan approval. A grading permit will not be issued until VSMP, road, and Final Site plans are approved. 10. (Rev. 2) All areas used as Forest and Open Space on the VRRM worksheet will need to be shown and labelled as 'SWM Forest & Open Space Easement'. The following note will need to be placed on the plan: "The SWM Forest and Open Space Easement is subject to the guidance set forth by DEQ in the Virginia Stormwater Management Program. The areas will remain undisturbed in a natural, vegetated state, except for activities as approved by the local program authority, such as forest management, control of invasive species, replanting and revegetating, passive recreation (e.g., trails), and limited bush hogging to maintain desired vegetative community (but no more than four times a year)." (Rev. 3) Comment addressed 11. (Rev. 2) At the time of final plat submittal, a Deed of Dedication will need to be signed and recorded for the SWM facility easements and the SWM Forest and Open Space easements. This will filled out by the County and forwarded to the applicant when the final plat is nearing approval. 12. (Rev. 2) Show parcels, owner and TMP information for all properties as they exist today. (Rev. 3) Comment addressed D. Erosion and Sediment Control Plan (ESOP) Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESOP. This plan is approved, and the reasons are provided in the comments below. The erosion control plan content requirements can be found in County Code section 17-402. 1. Additional erosion control measures should be used below ST1 to ensure runoff does not enter the neighboring property. Demonstrate how ST1 will function during construction. It appears that it will be filled in almost immediately when the storm system and fill slope are installed. Comment not addressed. Site does not appear adequately protected through all stages of construction. It is also recommended that offsite grading easements are acquired when grading within 5' of the property line. Please schedule a meeting to discuss how to move forward. (Rev. 2) See comments below. 2. (Rev. 2) Show the full grading for the sediment traps on the plans. As shown, the proposed trap elevations will not tie into the existing contours. Also show the drainage area to the traps. (Rev. 3) Comment addressed 3. (Rev. 2) Provide safety fence along the limits of disturbance next to the neighboring property in the western corner of the site. (Rev. 3) Comment addressed 4. (Rev. 2) Provide silt fence between the limits of disturbance and the diversion dikes along the southeast and southwest property lines. (Rev. 3) Comment addressed 5. (Rev. 2) For diversion dikes with slopes greater than 2%, the channel shall be stabilized in accordance with Spec. 3.17, Stormwater Conveyance Channel. Show the type of stabilization and the detail on the plans. Revise diversion dikes that are shown flowing uphill. (Rev. 3) Comment Engineering Review Comments Page 4 of 5 addressed 6. (Rev. 2) Show the Clean Water Diversion detail on the plans. (Rev. 3) Comment addressed (Rev. 2) Show the Outlet Protection design and dimensions on the plans. (Rev. 3) Comment addressed 8. (Rev. 2) Provide additional measures below ST-2 and 3 to limit the sediment entering the public street and to slow the water before it reaches the existing inlet so it does not bypass the inlet. Provide Inlet Protection for inlet located across Inglewood Ct. (Rev. 3) Comment addressed 9. (Rev. 2) Provide import/export quantities. If import or export exceeds 10,000 CYs, provide permit information for offsite borrow/waste area. (Rev. 3) Comment addressed 10. (Rev. 2) Provide a temporary right-of-way diversion at the entrance to the site at Inglewood Dr./Ct. (Rev. 3) Comment addressed The VSMP permit application and all plans may be resubmitted for approval when all comments have been satisfactorily addressed. For re -submittals please provide 2 copies of the complete permit package with a completed application form. Engineering plan review staff are available from 2-4 PM on Thursdays, should you require a meeting to discuss this review. Process; After approval, plans will need to be bonded. The bonding process is begun by submitting a bond estimate request form and fee to the Department of Community Development. One of the plan reviewers will prepare estimates and check parcel and easement information based on the approved plans. The County's Management Analyst will prepare bond agreement forms, which will need to be completed by the owner and submitted along with cash, certificates or sureties for the amounts specified. The agreements will need to be approved and signed by the County Attorney and County Engineer. This may take 2-4 weeks to obtain all the correct signatures and forms. Stormwater Management Facilities Maintenance agreements will also need to be completed and recorded. The County's Management Analyst or other staff will prepare the forms and check for ownership and signature information. The completed forms will need to be submitted along with court recording fees. After bonding and agreements are complete, county staff will need to enter project information in a DEQ database for state application processing. DEQ will review the application information based on local VSMP authority approval. At this time, the DEQ portion of the application fees will need to be paid directly to the state. For fastest processing, this is done electronically with the emails provided on the application. DEQ should notify applicants with instructions on how to pay fees. When DEQ approves the application, they will issue a permit coverage letter. This should be copied to the county. After DEQ coverage is issued, via the coverage letter, the County can hold a pre -construction conference. Applicants will need to complete the request for a pre -construction conference form, and pay the remainder of the application fee. The form identifies the contractor and responsible land disturber, and the fee remaining to be paid. This will be checked by county staff, and upon approval, a pre -construction Engineering Review Comments Page 5 of 5 conference will be scheduled with the County inspector. At the pre -construction conference, should everything proceed satisfactorily, a joint VSMP and grading permit will be issued by the County so that work may begin. County forms can be found on the county website forms center under engineering; http://www.albemarle.org/deptforms.asp?department=cden.gwpo File: WPO201600007 Inglewood Terrace rev3 10-26-18.doc