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Home My WebLink AboutWPO202000044 Review Comments WPO VSMP 2021-01-13Phone (4341296-5832 Project: Project Tile#: Plan preparer: Owner or rep.: Plan received date: (Rev. 1) Date of comments: (Rev. 1) Reviewer: Cil 1T COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, North Annex 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 [ kathrynduantenpaskigmiil.com ] 14 Sep 2020 9 Dec 2012 28 Oct2020 13 Jan 2021 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. (Rev. 1) Addressed. 2. Include reference to WP02020-00044 in single-family SWPPP title. (Rev. 1) Addressed. 3. New: Please revise SWPPP title page Construction Activity to match site location (Albemarle). 4. New: With change in state VAR10 CGP reporting requirements, DEQ requires local authorities issue a generic coverage letter and VAR10 for single-family construction area of land disturbance > 1 Ac. This project qualifies. Please revise SWPPP to include attached coverage letter and attached (generic) VAR10. B. Pollution Prevention Plan (PPP) — See Sec. A above. Single-family SWPPP with VSMP /WPO plan will suffice. (Rev. 1) Addressed. 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, Fiiz. 2.4B, and ensure profile and plan ELS details from DEQ specification display clearly on ti (Rev. 1) Addressed. [image included with initial comments removed with Rev. 1 comments.] 2. C7 /Level spreader -Tvp. detail (Rev. 1) Addressed. a. Include schematic representation of the ELS structure (concrete or timber). b. Provide x-sectional dimensions (W x D). Specify length. Engineering Review Comments Page 2 of 4 c. Also, recommend see VA DEQ Stormwater Design Specification No. 2, F _. 24, bele . [image included with initial review removed with Rev. 1 comments.] d. Include underdrain in C7 detail to prevent pending /nuisance conditions, ref. Fie 2.3. e. Daylight ELS underdrain. (Although C7 detail is descriptive, it lacks clear structural element and underdrain.) 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. (Rev. 1) Not addressed. Please consider (attached) email, and revise design, accordingly, partial /relevant email text: `0.9 lb. phosphorus reduction is required: either purchase nutrient credits, or on -site SWM; either is fine. 17-403.13 allows Agreement in lieu ofa SWMplan at Administrator's discretion. It is not automatic. SE in fact has likely prepared single-family VSMP applications (equivalent scale) with on -site SWM facilities, or nutrient purchase. This is no different, and unless SE has coordinated this project with the county engineer and has received advance assurance that a SWM plan was not or would not be requested or expected, then similar to administration of comparable single-family residences (2.76 Ac. LOD, 0.45 Ac. new impervious area), stormwater management quality requirements (9VAC25-870-65) apply. 9VAC25-870-65 specifically mandates application of VRRM.xls. Again, we will send VRMM.xls acceptable to Engineering based on soils maps met. with Cale. packet.' Also: a. Revise SWM Narrative, C5, to: i. Reference SWM quality requirements, ii. Revise text /typo to ref. 9VAC25-870-65 (quantity). b. Provide VRRM.xls /New development runoff reduction spreadsheet. 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 WPO202000044. (Rev. 1) Addressed. 2. C3 (Rev. 1) Acknowledged. 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. 3. C4 a. Cross-check sequence of construction phasing (04) with sequences on C5 (ESC Ph-1), C6 (ESC Ph-2). (Rev. 1) Addressed. b. Stormwater Management Note: Address stormwater quality requirements (9VAC25-870-65). Also, see Engineering email sent 10/28/2020 11:16 AM. (Rev. 1) Not addressed. Also, item C.3., above. 4. Check /revise sequence of construction text items 1-6, C5C6, for accuracy, for example: (Rev. 1) Addressed. a. Ruritan Lake Road may require revision. (Rev. 1) Addressed. b. Reference to sediment basin may not apply. (Only sediment trap with this design). (Rev. 1) Addressed. c. New: Revise Sequence phase 2, Note 8, to require ESC inspector approval prior to removal of ESC measures. d. New: Revise SWM Narrative to ref. 2.81 Ac. land disturbance, consistent with plan, and text, elsewhere. 5. C6 (Rev. 1) Partially addressed;follow- at item. 5.e., below. 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. Engineering Review Comments Page 3 of 4 e. Provide culvert 2 profile. (Rev. 1) Partially addressed. As ollow-up: Provide OP at lower end of pipe. Relabel `inlet protection.' 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. (Rev. 1) Partially addressed. As ollow-up: Please revise contour labels to dark black (color) as opposed to faint gray, for readability. b. Revise CE label to read PCE (paved construction entrance). (Rev. 1) Addressed. c. Revise ELS length based on Qtan 2.93cfs). Ref. VA DEQ Stormwater Design Specification No. 2, Table 2.2, and pg. 14. (Rev. 1) Not addressed. Design does not acknowledge initial explicit reference to BMP standard (VA DEQ Stormwater Design Specification No. 2) 10-yr frequency storm. Please respond to comment; revise ELS length to 38ft. minimum. Please call if any questions. VA DIED STORMWATER DESIGN SPECIFICATION NO.2 SHEET FLOW TO FILTER OR OPEN SPACE An alternative approach is that utilized by Henrico 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.henrico.va.ustworks/eesd/.) d. Show break in silt fence (SF) below ST weir. (Rev. 1) Addressed. 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. (Rev. 1) Addressed. GIS: [ image included with initial review removed with Rev. 1 comment. ] 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 forms. Note (New): With change in state VAR10 CGP reporting requirements, DEQ requires local program authorities to issue a generic coverage letter and VAR10 for single-family construction with area of land disturbance > 1 Ac. This project qualifies. Please revise SWPPP to include attached coverage letter, and attached (generic) VAR10. Please call if any questions. (This is a local program action that does not involve a state agency directly, nor elevate required (permit) fee/s.) 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 Engineering Review Comments Page 4 of 4 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/govemment/community-develol)ment/aooly-for/engineering-applications WPO202000044_Tenpas Residence VSMP_011321_revl John Anderson From: John Anderson Sent: Wednesday, October 28, 2020 11:16 AM To: Michael Chandler, Justin Shimp; Kelsey Schlein Subject: RE: Tenpas Residence (WP0202000044) Michael, I appreciate your note —CV entry ( 9/30/20; Denied appears to be an error. I am reviewing the print plan now, will send VRMM.xIs that you may simply copy /paste to plan. 0.9 lb. phosphorus reduction is required: either purchase nutrient credits, or on -site SWM; either is fine. 17-4038 allows Agreement in lieu of a SWMplan at Administrator's discretion. It is not automatic. SE in fact has likely prepared single-family VSMP applications (equivalent scale) with on -site SWM facilities, or nutrient purchase. This is no different, and unless SE has coordinated this project with the county engineer and has received advance assurance that a SWM plan was not or would not be requested or expected, then similar to administration of comparable single-family residences (2.76 Ac. LOD, 0.45 Ac. new impervious area), stormwater management quality requirements (9VAC25-870-65) apply. 9VAC25-870-65 specifically mandates application of VRRM.xls. Again, we will send VRMM.xIs acceptable to Engineering based on soils maps incl. with Calc. packet. Note: I checked for email relating to this project sent 9/30, and find no record of a review, email, etc. Later, I may understand what happened, but for now and today, hope to send review comments by 5pm. Thanks for your help and patience, Michael best, J. Anderson 434.296-5832 -x3069 From: Michael Chandler <michael@shimp-engineering.com> Sent: Wednesday, October 28, 202010:16 AM To: John Anderson <janderson2@albemarle.org>; Justin Shimp <justin@shimp-engineering.com>; Kelsey Schlein <kelsey@sh i m p-engi neering.com> Subject: Tenpas Residence Hi John, Wanted to check in with you on your review of the Tenpas Residence. County View appears to show the review complete as of 9/30/2020 but we have not received anything. Thanks, MICHAEL CHANDLER Project Engineer MichaeldShimo-Enaineerina.com Shimp Engineering, P.0 912 East High St. Charlottesville, VA 22902 434.227.5140 H shim clesian.com