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Home My WebLink AboutWPO201800025 Correspondence 2018-06-05 J SEH Building a Better World for All of Us'' June 5, 2018 RE. Rivanna Water and Sewer Authority W PO-2018-00025 Crozet WTP Expansion and Rehabiliation Project SEH No. RIVAN 144134 14.00 Matt Wentland Engineering Department Albemarle County 401 McIntire Road, Room 227 Charlottesville, Virginia 22902-4596 Dear Matt Wentland: This letter is supplemental to the second submission of the VSMP Permit for Crozet WTP Expansion and Rehabilitation Project, WPO201800025. Responses to comments on the initial submittal dated May 10, 2018, are outlined below. A. Stormwater Pollution Prevention Plan (SWPPP) 1 Since this portion of the site is in addition to the 1.4 acres of disturbance shown on the existing DEQ permit, the registration statement will need to be completed and signed and the acreage updated to reflect the projects total disturbance. i Previous projects (GAC and FWPS) disturbance was 1.39 acres. Proposed disturbance is 0.62 acres. Approximately 0.28 acres of proposed disturbance overlaps the previous projects disturbance. Therefore, the total disturbance is 1.73 acres, as changed on the DEQ Permit. II. DEQ permit is signed. 2 The Certification (section 9)will need to be signed i Section 9 is signed B. Pollution Prevention Plan (PPP) 1 The PPP appears acceptable at this time. i. No action required. C. Stormwater Management Plan (SWMP) 1. Provide copies of all recorded easements or agreements for offsite work. i Recorded easement for tax map 57A-2B-21, to be submitted once obtained D. Erosion and Sediment Control Plan (ESCP) 1. Include the detail for a paved construction entrance I. Detail for paved wash rack added to sheet 13 of 13. 2. Include a note on the plans that additional ESC measures may be required by the County ESC inspector. i. "Additional ESC BMP measures to be installed when required by the County ESC Inspector" added after Note 1 on sheets 9 and 10 of 13 Engineers I Architects I Planners I Scientists Short Elliott Hendrickson Inc.,3535 Vadnais Center Drive,St Paul,MN 55110-5196 SEH is 100%employee-owned I sehinc.com I 651 490 2000 I 800 325 2055 I 888 908 8166 fax Matt Wentland June 5, 2018 Page 2 Additional changes from submittal 1 included Scope of Work. 1. Additional work has been added to the scope of the project. The additional work includes connecting the sanitary sewer services from the filtration building, and the eastern ACSA maintenance building to the proposed sanitary sewer forcemain The additional work will result in 0 21 acres of additional disturbance Surface condition will be restored to pre-construction condition. Thus no changes to the pre and post impervious coverage Changes due to the work added are noted below. Application. 1. Section B.All Fees, changed total acres proposed to be disturbed from 0.76 to 0.97. This is due to the work added to the project. ECP & SWP- 1 Section 1. Project Overview, description of project updated This is due to the work added to the project 2. Section 2.2 Disturbance—Water Treatment Plant, disturbance acreage updated This is due to the work added to the project 3 Section 4.2 Water Quality Requirements—Water Treatment Plant, description of work updated and total phosphorus reduction required updated. This is due to the work added to the project 4. Tables 1 and 2, disturbance areas updated This is due to the work added to the project. 5. Appendix C,Water Treatment Plant Site—Water Quality, disturbance areas updated. This is due to the work added to the project. SWPPP & PPP: 1 Section 3. Nature of Activity, disturbance area and nature of activity updated. This is due to the work added to the project. 2 Section 4. Erosion and Sediment Control Plan, updated with changes noted above in D.1.i and 2.i. and updated with disturbance from sanitary sewer services for the Filter Building, and ACSA maintenance garage 3. Section 5. Stormwater Management Plan, added watermain connection on the Loading Dock Grading detail, and aggregate thickness on the Typical Loading Dock Grading Section detail 4 Section 6. Pollution Prevention Plan. Updated with sanitary sewer services for the Filter Building, and ACSA maintenance garage. Plans 5. Sheet 3. Demolition, updated with sanitary sewer services for the Filter Building, and ACSA maintenance garage 6. Sheet 4. Proposed Improvements, updated with sanitary sewer services for the Filter Building, and ACSA maintenance garage. 7 Sheet 5. Grading and Drainage, added watermain connection on the Loading Dock Grading detail, and aggregate thickness on the Typical Loading Dock Grading Section detail 8 Sheet 6. Utilities Plan, updated with sanitary sewer services for the Filter Building, and ACSA maintenance garage. 9. Sheet 7. Utilities Plan 2, added sheet for the sanitary sewer services for the Filter Building, and ACSA maintenance garage 10 Sheets 8. & 9. Landscaping Plan, (sheets 7 &8 in previous submittal) removed Leyland cypress, spaced out plantings, added Eastern Red Cedar on the north side of the access drive, per ARB and SDP comments. Matt Wentland June 5, 2018 Page 3 11. Sheets 10. ESC Plan, (sheet 9 in previous submittal) updated with disturbance from sanitary sewer services for the Filter Building, and ACSA maintenance garage Added note per WPO comments. Scale changed such that the entire site ESC Plan fits on one sheet Thus, sheet 2 of the ESC Plan removed 12 Sheet 13. ESC Details 3, updated with paved wash rack detail, per WPO comments If you have any questions or require any additional information, please contact me at 434.409.0464 Sincerely, SHORT ELLIOTT HENDRICKSON INC. Doug March Sr Professional Engineer II MNT Enclosure(2 copies of each) Application ECP & SMP Report SWPPP & PPP Plans (full size, original signature) \\sp3020-1\projects\pt\r\riven\14413413-env-stdy-regs\38-reg\3 wpo\submittal\submittal 2\0 0 wpo_submittal 1_response letter docx