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Home My WebLink AboutWPO202000044 Review Comments WPO VSMP 2020-10-28Phone (4341296-5832 Project: Project Tile#: Plan preparer Owner or rep. Plan received date: Date of comments: Reviewer: Cil 1T COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902-4596 Fax(4341972-4126 VSMP Permit Plan Review Tenpas Residence - VSMP WPO202000044 Michael Chandler, Shimp Engineering michael e shimp-en ing eering com Kelsey Schlein kelwyk shimp-engineering corn Shimp Engineering P.C., 912 E. High Street, Charlottesville, VA 2290 Ronald Jay & Kathryn Dunn Tenpas, 4311 Elm Street Chevy Chase, MD 20815-6056 [ kathrynduantenpask=ail.com ] 14 Sep 2020 28 Oct2020 John Anderson 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 for reasons listed below. 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 ESCP, (3) a SWMP, and (4) any TMDL measures necessary. 1. Submit SWPPP for single-family construction. Please use county template (SF SWPPP). Link to template will be sent to Michael Chandler and Kelsey Schlein. 2. Include reference to WP02020-00044 in single-family SWPPP title. B. Pollution Prevention Plan (PPP) — See Sec. A above. Single-family SWPPP with VSMP /WPO plan will suffice. The PPP content requirements can be found in County Code section 17-404. C. Stormwater Management Plan (SWMP) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is disapproved for reasons listed below. The storrnwater management plan content requirements can be found in County Code section 17-403. 1. Compare level spreader detail, C7, with details shown with VA DEQ Spec. No. 2, Fig. 2.4B, and ensure profile and plan ELS details from DEQ specification display clearly on the plan. VA DEO STORMWATER DESIGN SPECIFICATION NO.2 K{frATHILY Cf ►tii'si+aw+�•i+ei•C +si's0+>'09.+cD+F IRS`!►+'�'O� SHEET FLOW TO FILTER OR OPEN SPACE wr[: coraiT sEcarwiwas rMARWRMlFIH6 PROFILE Engineering Review Comments Page 2 of 4 Figure 2.4B: Section -Alternative Level Spreader with Vegetated Lip 2. C7 /Level spreader -Tvv. detail a. Include schematic representation of the ELS structure (concrete or timber). b. Provide x-sectional dimensions (W x D). Specify length. c. Also, recommend see VA DEQ Stormwater Design Specification No. 2, Fie. 2.3, below. d. Include underdrain in C7 detail to prevent ponding /nuisance conditions, ref. Fie 2.3. e. Daylight ELS underdram. (Although C7 detail is descriptive, it lacks clear structural element and underdrain.) LOW eraader y 3'Later of Ror r / 057 Stone / mParlanBLdFW aFilter S&V � l r Channel r t _ 3RWl Underdrnn- 5aed 5tnp d. For 5Rc 5011 filter Fabnc Condltlom - Drnn Appropnatey 5ued Into Bypx Swab Concrete Footer Figure 2.3: Plan and Cross Section of Engineered Level Spreader (ELS) (Hathaway 2006) Version 1.9, March 1, 2011 Page 5 of 20 Engineering Review Comments Page 3 of 4 3. Ref. email sent 10/28/2020 11:16 AM (to SE) on topic of stormwater quality requirements, revise plan accordingly. Recommend standalone SWM plan sheet. Also, ESC plan review comment item 3.b. below. D. Erosion and Sediment Control Plan (ESCP) Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is disapproved for reasons listed, below. The erosion control plan content requirements can be found in County Code section 17-402. 1. Revise plan title to include ref. to WP0202000044. 2. C3 3. C4 a. Note: VDOT Land Use permit required for work within public right -of way (driveway entrance). b. Note: VDOT entrance permit required; please coordinate with VDOT Charlottesville Residency. a. Cross-check sequence of construction phasing (G4) with sequences on C5 (ESC Ph-1), C6 (ESC Ph-2). b. Stormwater Management Note: Address stormwater quality requirements (9VAC25-870-65). Also, see Engineering email sent 10/28/2020 11:16 AM. 4. Check /revise sequence of construction text items 1-6, C5C6, for accuracy; for example: a. Ruritan Lake Road may require revision. b. Reference to sediment basin may not apply. (Only sediment trap with this design). 5. C6 a. Label sediment trap (ST) floor dimensions. b. Remove proposed grading from stream buffer. (Slight amount of grading appears within 100' stream buffer.) c. Label ST weir L x W x D dimensions. d. Label driveway width. e. Provide culvert 2 profile. f. Show /label riprap OP, culvert 1, 2. g. Show roadside ditch between elevation 610' and culvert 2 on west side of driveway. Runoff from driveway surface will erode /create a ditch unless controlled ditch section is defined with design. h. Provide ditch x-section; item g., above. i. Provide check dams, as needed, for ditch, item g., above. 6. C5C6 a. Provide additional existing contour labels. b. Revise CE label to read PCE ( paved construction entrance). c. Revise ELS length based on Qlun (2.93cfs). Ref. VA DEQ Stormwater Design Specification No. 2, Table 2.2, and pg. 14 VA DEQ STORMWATER DESIGN SPECIFICATION NO.2 SHEET FLOW TO FILTER OR OPEN SPACE An alternative approach is that utilized by Hemico County, where pipe or channels discharge at the landward edge of a floodplain or stream (Resource Protection Area or RPA) buffer. The entire flow is directed through a stilling basin energy dissipater and then a level spreader such that the entire design storm for the conveyance system (typically a 10-year frequency storm) is discharged as sheet flow through the buffer. (Refer to Henrico County's Environmental Program Manual; Chapter 9, Minimum Design Standard 9.01 "Energy Dissipater": hftp://www.co.hendoo.va.ustworks/eesd/.) d. Show break in silt fence (SF) below ST weir. Across sheets (C2, C3, C5, C6): Revise stream buffer linework (at pond) near entrance on Wesley Chapel Road, since buffer extends SE and downstream to adjacent property line. GIS: Engineering Review Comments Page 4 of 4 The VSMP permit application and plan may be resubmitted for approval when all comments have been satisfactorily addressed. Please provide digital version of revised plan /SWPPP with a completed application form for quicker review. Process: After approval, plan will have 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 have to be completed by the owner and submitted along with cash, certificates or sureties for the amounts specified. The agreements will have to be approved and signed by the County Attorney and County Engineer. This may take 24 weeks to obtain all the correct signatures and foams. After bond is posted, the County can hold a pre -construction conference. Applicant must 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 fee remaining to be paid. This will be checked by county staff, and upon approval, a pre -construction conference will be scheduled with the County inspector. At the pre -construction conference, should everything proceed satisfactorily, a 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 applications; httl)s: //www.albemarle. org/govemmenVcommunity-develol)ment/aooly-for/engineering-applications WP0202000044_Tenpas Residence VSMP_102820