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Home My WebLink AboutWPO201500085 Approval - County 2016-06-13COUNTY 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: Charlottesville Self Storage at Crozet, VSMP Project File Number: WP0201500085 Plan preparer: Scott Collins/Graham Murray, Collins Engineering [200 Garrett St., Suite K, Charlottesville, VA 22902, scott(cDcollins-engineering.com] Owner or rep.: H.M. Walker, Jr./Albemarle Storage, LLC, P. O. Box 332, Charlottesville, VA 22902 Jo Higgins, Project Development LLC, 2564 Mt. Torrey Road, Lyndhurst, VA 22952 T: 434.326-0334 1 musxit&aol.com Plan received date: (Rev. 1) (Rev. 2) Date of comments: (Rev. 1) (Rev. 2) Reviewer: 26 Oct 2015 17 Feb 2016 18 Apr 2016 10 Dec 2015 28 Feb 2016 13 Jun 2016--AARyroved John Anderson Note/Current bond amounts: $4,500 remains on WPO/ESC (BND200500021 WP -SE); $62,000 (original) remains on WPO/SWM bond (BND200500022WP-SW). Note above (current bond Amt.) included with WP0201500020; will confirm if still valid/ if any change since Apr -2015. A. Stormwater Pollution Prevention Plan (SWPPP) —See File WP0201500020 for 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. B. VSMP: SWPPP: Stormwater Management Plan (WP0201500085) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is approved. CV/Initial submittal comment: Request to amend WP0201500020 to remove an approved BMP with subsequent increase in amount of phosphorus leaving any point of discharge, or increase in volume or rate of runoff, would forfeit Grandfathering Part II C technical criteria. This means, were the bioretention facility removed, the self -storage facility SWM design must comply with Part II B water quality and quantity requirements (9VAC25-870-65 / 9VAC25-870-66). We discussed proposal with DEQ, have sent email to DEQ to confirm our understanding, but have not heard back. Amendment application was discussed with the County Engineer and Department Director. We have waited sine 8 Dec for DEQ response to attached email, and will forward any correspondence we receive. WP0201500020 may not be amended to remove approved bioretention near building G unless SWM design provides on-site features compliant with Part II B technical criteria. (Rev. 1) Addressed. Engineering Review Comments Page 2 of 3 Recommend revise Plan Title to include Amendment to WPO201500020. (Rev. 2) Addressed. Edit [text box] Note, sheet 4, to reference WPO201500020. Reference to WPO2005-00012 neglects recent VSMP Approval for this facility (22 Apr 2015), leaving gap similar to reference to approved SWM facility at Avinity Estates. This may mislead in terms of existing, valid VSMP permit approval. This Amendment seeks to modify WPO201500020 for a portion of the facility. (Rev. 2) Addressed. 2- , 10 -yr (routed) flows indicate design sufficient to attenuate developed runoff to less than pre -developed runoff rates, but before system design can be approved, please: a. Provide graphic exhibit of pre- /post -developed areas to show how/where development decreases impervious area 0.05 Ac. (2,178 SF) (Rev. 2) Addressed. Ref. Graham Murray (FGM), Collins Engineering email, March 17, 2016 1:48 PM. b. Revise Str. 2 INV out to Str. 8 (bypass) < 642.46' (=30" DIA pipe elevation at weir plate, Str. 4) to avoid surcharge condition at weir plate. Appears reasonable to set bypass < this elevation. (Rev. 2) Addressed. Str. 2 INV Out Elev. =642.95' to Str. 8 is acceptable. —Ref. 3/17 FGM email. c. Specify 30" weir plate material —not HDPE; specify steel gauge. (Rev. 2) Addressed. —Ref. 3/17/16 email. "The manufacturer ...advised ...SRPE material should be used for the weir plate." d. Specify 30" detention system material. (HDPE?) (Rev. 2) Addressed. Material is steel reinforced polyethylene (SRPE) —Ref. 3/17/16 FGM email. e. Amendment Calculations (Jan 27 2016) exclude bypass from routing, yet include Str. 4 Access, with INV =644.7' (TOP Str. 4). At Elev. 642.46', bypass activates (2.b., above). It appears bypass will influence routing, and should be included/considered. Please feel free to call to discuss. (Rev. 2) Addressed. 3/17/16 FGM email cites Mfr. design assurance. f. Revise routings, as needed. (Rev. 2) Addressed. Comment withdrawn. —Ref. J. Anderson email to FGM/Collins Engineering, March 17, 2016 5:23 PM. g. Please provide Contech material/labor estimate of Duromaxx system (installed expense) to improve bond estimate (this is a request, not a requirement; it's been very helpful in the past). This value will be compared with existing SWM bond, with goal of continuing current SWM bond, for sake of simplicity. (Rev. 2) Addressed. —Ref. March 17, 2016 1:29 PM FGM email. ["The cost estimate for this DuroMaxx system is $12,000 delivered to the project site."] 5. Amended Storm Sewer label (sheet 4A) states VDOT ST -1 required for several structures. Other structures appear to require ST -1 (steps); please ensure labels identify all structures requiring VDOT ST -1 (steps). (Rev. 2) Addressed. C. VSMP: SWPPP: Erosion Control Plan (WPO201500085) Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is approved. 1. Minor: Sheet 2, Sediment trap 1 design table, 16' width; plan view, 26'. Please reconcile. (Rev. 2) Addressed. Process: It is unclear if current SWM bond is sufficient. Mfr. estimate of $12,000 site -delivered material expense (which does not include installation) requires bond; this may be offset, partially or in whole, by the original $62,000 SWM plan bond that includes a biofilter not to be built with this plan. A pre -construction meeting may have been held following VSMP permit approval, Apr -2015. I am uncertain. I am uncertain beyond point of Apr -2015 approval. Project holds valid VPDES CGP: VARIOG818 (Albemarle Storage LLC; Estimated Area to be disturbed =1.67 Ac). At pre -construction conference (if required), should everything proceed satisfactorily, a grading permit will be issued by the County so that work may begin. Engineering Review Comments Page 3 of 3 Todd Shifflett is contact for fee and pre -construction process questions; Tel: 434.296-5832 —x3072. County forms can be found on the county website forms center under engineering; http://www.albemarle.org/deptforms.asp?department--cdengwMo File: WPO201500085 VSMP Charlottesville self-storage_061316rev3 Approv