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Home My WebLink AboutWPO201700078 Review Comments Appeal to BOS 2018-04-20COUNTY 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: Western Albemarle High School Science Lab Project file number: WP0201700078 Plan preparer: Craig Kotarski [craig.kotarski@timmons.com] Owner or rep.: Albemarle County School Board, Joe Letteri b letteri@K 12albemarle. org] Plan received date: 02 December 2017 (Rev. 1) 22 February 2018 (Rev. 2) 12 April 2018 Date of comments: 08 January 2018 (Rev. 1) 09 March 2018 (Rev. 2) 20 April 2018 Reviewer: Bobby Jocz (Rev. 1) WW Associates, Inc. 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 approved. 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. 1. Signed Copy of registration statement will be required with final submittal. (Rev. 1) Response: A Division (Diversion?) Dike detail has been added to the plans. See sheet C3. (Rev. 1) Comment: Comment not addressed. It appears that consultant addressed a comment as follows: Plans call for a clean water diversion, however, a detail is not provided on the plans. If you plan to use the diversion detail in the plans or both, please clarify or revise. (Rev. 2) Comment addressed. Requested information added to plan/provided. 2. Provide WPO number on coversheet of plan sets, and the front cover of calculations Packet. (Rev. 1) Comment addressed. Requested information added to plan. B. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17-404. 1. One of the provided SWPPP copies is missing the end of section 6, and sections 7-12. Please provide updated SWPPP. (Rev. 1) Comment partially addressed. Section 9 is to be signed and dated by Mr. Joseph P. Letteri. Section 10 Delegation of Authority is to be executed. (Rev. 2) Comment addressed. Requested information provided. 2. Include WPO number on front cover of SWPPP copies. (Rev. 1) Comment addressed. Requested information added. Engineering Review Comments Page 2 of 4 3. Copy of GCP and blank inspection logs should be provided in final SWPPP copy submittal. (Rev. 1) Comment addressed. Requested information added. C. Stormwater Management Plan (SWMP) VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is approved. The stormwater management plan content requirements can be found in County Code section 17-403. 1. [C4.0] Weir designs not provided in landscaping plan as indicated. Weir design should be provided in stormwater details along with dry swale design detail. Ensure all weir seizes are dimensioned consistently (Wide, high, deep, long, are identified unclearly between dimensions). Indicate weir notch shape (rectangular, trapezoidal, etc.). (Rev. 1) Comment addressed. Weir/dry swale design deleted and replaced with a small pond with permanent pool. Pond facility for ESA program and not for SWM. 2. [C5.0] No detail is provided for rock channel with check dams as indicated. Please provide detail in stormsewer details section. (Rev. 1) Comment addressed. Rock channel with check dam deleted from plan. 3. [C5.2] Table or annotations should be provided presenting overview of pipe and inlet sizes/types. This should include both proposed and existing pipes/inlets utilized in final site conditions. (Rev. 1) Comment addressed. Requested information has been added to plan. 4. [C7.0] Provide longitudinal cross section detail of dry Swale design from concrete flume to end of dry Swale. Ensure current perpendicular cross section detail of dry swale includes all elements including underdrain, weir cross section, pre-treatment cell, etc. (diagram indicates the existence of underdrain, but does not detail). Include elevations. (Rev. 1) Comment addressed. Dry swale removed from plan. 5. [C7.0] Detail should be provided for drainage ditches shown directing flow towards inlet 112. In addition, channel flow calculations should be included. (Rev. 1) Comment partially addressed. Swale drainage flow arrows provided, however, swale sections and calculations not provided. Provide swale sections and calculations demonstrating that 2 -year storm velocity is non-erosive and that 10 -year storm depth is contained within the Swale/channel. (Rev. 2) Comment addressed and criteria met. 6. [C7.0] Include details for all stormsewer structures utilized in the project (ex. MH -1). (Rev. 1) Comment addressed. Requested information has been added to the plan. 7. [L2.0] Greater detail must be provided for "flow through planters". What elevation are drains/"risers" to be located at in relation to the top of the media? Where do drainage pipes flow through planters? Are gravel areas at same elevation as planter sections? What type of gravel is to be used over drain areas? Do planters detain water/is there staging (should be included in calculations if so)? Cross section of planter does not match detail. (Rev. 1) Comment addressed. Flow through planters deleted and replaced with VDOT standard storm drain structures. 8. [Calculations Packet] It is unclear how courtyard area is incorporated into LD -229 analysis, please provide clarification. (Rev. 1) Comment addressed. LD -229 form complete to outfalls at existing structures EX -10 and EX -1. 9. [Calculations Packet] It does not appear drainage from RD -2 is incorporated into the LD -229 analysis for inlet 124. Please correct/clarify. (Rev. 1) Comment addressed. Storm drain pipe calculations revised to include roof drain areas. 10. [Calculations Packet] Stormsewer calculations, profiles, and analysis should include existing pipes. It is unclear due to design/analysis that current pipes downstream of system modifications Engineering Review Comments Page 3 of 4 will accommodate proposed flows. (Rev. 1) Comment addressed. Profiles and calculations demonstrate that existing system is adequate. 11. [Calculations Packet] VRRM spreadsheet indicates 0.04ac of forest and open space are to be conserved to partly address water quality requirements. Please indicate location of forest and open space areas. Note: Forest and open space areas must be placed into conservation easement for credit for stormwater quality improvements. F&OS must also conform to maintenance requirements set forth through VSMP program. (Rev. 1) Comment addressed. Forest and open space deleted from VRRM spreadsheet. SWM quantity and quality controls still met. 12. [Calculations Packet] Stormsewer profiles indicate structure EX -1 as a MH -1 despite including it in the drainage calculations as a stormsewer inlet. Please clarify structure type. (Rev. 1) Comment addressed. Plans and calculations corrected. Structure EX -1 is an energy dissipation type outfall structure. 13. [General] Side slopes of grass Swale are measured as 3:1 on plan views, but indicated as 4:1 on detail. Please clarify. (Rev. 1) Comment addressed. Grass Swale deleted from plan. 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 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. Include the excavated drop inlet sediment trap in the E&S narrative under the structural practices section. (Rev. 1) Comment addressed. Requested information has been added to the plan. 2. Maintenance details for each practice should be provided for E&S measures on the plans, or within SWPPP. (Rev. 1) Comment addressed. ESC maintenance information has been added as requested. 3. CE should be better located to prevent site access that bypasses CE (Rev. 1) Comment addressed. CE location shown on sheet C3.1 is functional. The VSMP permit application and all plans may be resubmitted for approval. Please provide 2 additional copies of the plans and the SWPPP. 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. 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 Engineering Review Comments Page 4 of 4 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 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; httD://www.albemarle.orv/deDtforms.aSD?deDartment--cdenewi)o Bobby Jocz Albemarle County Community Development — Engineering rjocz@albemarle.org (434) 296-5832 ext. 3283