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Home My WebLink AboutWPO202000034 Correspondence WPO VSMP 2023-01-0461 ROUDABUSH, GALE & ASSOCIATES, INC. ENO/NEEFS. SUFVEVOFS AND I D P NEFS Date: January 4th, 2023 To: Frank Pohl, PE From: Dustin Greene, PE RE: Belvedere Phase V VSMP Amendment 2 # of Date Job # Description 2 1/6/23 8438 VSMP Amendment 1 7/5/22 - VSMP Amendment Application 1 1/4/23 - Cover and comment response latter 2 7/1/22 - H&H Calculations 1 12/19/22 - Purchase agreement for nutrient credits 1 12/19/22 - Wire transfer agreement 1 1/4/22 - Check for $236.08 999 Second Street SE, Charlottesville, VA 22902 ROUDABUSH, GALE & ASSOCIATES, INC. ENGINEERS, Sl1RVE & AND LAND PLANNERS I Department of Community Development 401 McIntire Road Charlottesville, VA 22902 Mr. John Anderson January 4th, 2023 Re: WP02020-00034 Amendment #2 Belvedere V Mr. Anderson, Thanks for taking the time to review this project. There seems to be a bit of miscommunication on what we are requesting and what Albemarle County has requested. This cover letter and subsequent comment response letter will hopefully straighten out this discrepancy. In your email on 12/27/22 you had said that "In prior discussion, need to Amend WP02016-00071 did not come up." Frank Pohl and David James had made it pretty clear that an amendment to WP02016- 00071 would be required to at least show that the back of lots and back yards of lots 245-254 were no longer flowing to the type III retention basin in Belvedere Phase 1113. The 0.18 Ibs of nutrient credit have been purchased as a result and the affidavit of purchase has been provided with this submittal. The Amendment to WP02020-00034 is two -fold: 1. Show that the added area from the back of lots 245-254 do not create increased water quantity at point of analysis #2 at the outfall pipe. 2. Show the offsite grading and E&SC measures on the Dunlora Farm property. WP02020-0034 Amendment #2 is not amending any sediment trap from WP02016-00071. It is amending the originally approved sediment trap for WP02020-0034. See below for responses to the comments provided in your email 12/27/2022. 1. Provide overall view that places elements of Amendment #2 in relation to one another, and in relation to Belvedere and Dunlora Farm parcels. For example, 2 STs are proposed as ESC measures on Dunlora Farm (Amend #2, Sheet A11.2), while Amend #2 Sheet A18.2 label references modification to `the existing sediment trap (WPO-2016-00071). These areas are distinct and far from one another. First GIS image, below. RESPONSE: A map key has been provided on sheet A11.2 2. Provide ST3 and ST4 design tables (Dunlora Farm STs). Include A,B,C elevations: bottom trap, bottom weir, top weir elevations. RESPONSE: Design tables have been provided on sheet A11.2 999 Second Street SE. Charlottesville. VA 22902 www.Roudabush.com 3. Label WPO2020-00034 Amend #2 ST3 and ST4 floor dimensions (L x W); label weir L x W. RESPONSE: ST4 and ST5 floor dimensions have been provided on sheet A11.2 4. Depict WPO2016-00071 graphically on third and fourth sheets of Amendment. RESPONSE: WPO2016-00071 has been graphically depicted on sheets Al2.2 and A18.2. 5. Label proposed (red linework) contours on third sheet. RESPONSE: The proposed red linework contours have been labeled on sheet Al2.2. 6. Identify sediment trap, upper left corner, fourth sheet. RESPONSE: The sediment trap in the upper left corner of sheet A18.2 has been identified as ST3. 7. Provide identical data for modified existing WPO16-71 ST(#3?) as for ST3, ST4 ( table, floor /weir dimensions) RESPONSE: The previously approved sediment trap provided this data in a unique way due to the fact that the control structure is a riser. The data has been presented in a similar manner as to how it was originally approved so that it is easier to compare from the originally approved plans. The existing modified sediment trap never had a number designation for WPO2020-00034 so I will call it ST3 and this ST4 and ST5 for the remaining sediment traps on Dunlora Farm. * WPO16-71 ST Stage -storage data is presented in table, upper left, but ST is not shown on either sheet (third /fourth of Amendment #2.) RESPONSE: WPO2020-00034 stage -storage data is presented in table, upper left. ST3 is shown on sheet A18.2. * Identify existing ST to be modified; assume it is ST#3 of WPO16-71. RESPONSE: The existing sediment trap to be modified is shown on sheet A18.2. * Show outline of WPO16-17 existing ST graphically-WPO16-71, ST#3. RESPONSE: The outline for the existing sediment trap for WPO2016-00071 is not necessary since this trap has been removed. The modified sediment trap is from WPO2020-00034. * Label ST floor /weir dimensions, label A,B,C elevations, WPO16-71, ST#3. RESPONSE: The previously approved sediment trap provided this data in a unique way due to the fact that the control structure is a riser. The data has been presented in a similar manner as to how it was originally approved so that it is easier to compare from the originally approved plans. There are no weir dimensions. Sediment trap was originally approved with a riser structure to be converted to a dry pond. 999 Second Street SE. Charlottesville. VA 22902 www.Roudabush.com * Please confirm WPO2020-00034 Amendment sheets modify WPO16-71 ST#3. RESPONSE: WPO2020-00034 Amendment sheets do not modify WPO2016-00071 ST#3. 1. 'Matchline sheet 10' labels on 2nd — 3rd sheets misleading since not same Matchline sheet 10; locations removed from one another. RESPONSE: The matchline on sheet A.12.2 does match to sheet 10. 2. Please clarify Matchline sheet 10 labels are not shared matchline between second /third sheets of WPO202000034 Amendment #2. RESPONSE: The matchlines are correctly labeled. 3. Recommend revise ST3 Vol. required to 325.6 YD3, or leave as is. (Amendment #2, sheet A11.2). RESPONSE: The required volume for ST3 has been revised. 4. David James's WPO202000034 Amendment #2 review, 11/6/22, state 0.18 lb. nutrient credit required for WPO2020-00034 Amendment #2 approval. RESPONSE: 0.18 Ibs of phosphorous have been purchased. Affidavit of nutrient sale has been provided with this submittal 5. Pis confirm 0.18 lb. nutrient credits purchased. If not, please coordinate 0.18 lb. purchase thru Ana Kilmer, Management Analyst, Albemarle County. RESPONSE: 0.18 Ibs of phosphorous have been purchased. Affidavit of nutrient sale has been provided with this submittal 6. At Applicant discretion, if 0.18 lb. not yet purchased, then once other items addressed (Overall schematic; labels; notes; ST design data /dimensions), then Engineering can approve portion of Amendment #2 that involves off -site Dunlora Farm grading, without approving other elements of Amendment #2. RESPONSE: 0.18 Ibs of phosphorous have been purchased. Affidavit of nutrient sale has been provided with this submittal Offsite grading on Dunlora Farm parcel does not require phosphorus credit purchase. 1. Note: 2., top /middle images, below, is Belvedere Phase 56. RESPONSE: Comment noted. 999 Second Street SE. Charlottesville. VA 22902 www.Roudabush.com 2. Note: 3., middle /bottom images, shows Dunlora Farm, where Belvedere V contractor will perform off -site grading on Dunlora Farm, to extend Fowler St. /Miranda Crossing continuous with /onto Dunlora Farm Phase 1. RESPONSE: Comment noted. 3. Note: WP0202000034 Amendment #2 involves WP0201600071 Amendments 2/3 ST3, SWM calculations for Belvedere 5 and 2 sediment traps (ST3, ST4) required for Belvedere V off -site work on Dunlora Farm. RESPONSE: Updated SWM calculations have been provided for the modified ST3 for WP0202000034 Amendment #2. 4. Note: These far different sediment trap locations are okay, but need relational context: Pls provide overall schematic that shows locations covered by WP0202000034 Amendment #2, as well as address items, above. RESPONSE: Overall key map has been provided on sheet A11.2 5. NOTE: WP02016-00071 ST#3, approved to be removed /graded out with WP0201600071 Amendment #3 (established with WP0201600071 Amend #2, IMAGE /SCAN unavailable) is located north of Fowler St., image above (ST3), and top image location 1. below. RESPONSE: Comment noted. Best Regards, C:� '4'u4A'X� Dustin Greene, P.E. For Roudabush, Gale and Associates, Inc. 999 Second Street SE. Charlottesville. VA 22902 www.Roudabush.com