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Home My WebLink AboutWPO202000010 VSMP Exception Request Denied 2020-06-04COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, North Wing Charlottesville, Virginia 229024596 Phone 434 296-5932 Fax 434 972-4126 June 4, 2020 Mr. Justin Shimp, PE Shimp Engineering, P.C. 912 East High Street Charlottesville, VA 22902 RE: WP0202000010 Lithic Stoudt Handy — VSMP VSMP Exception Request Dear Mr. Shimp, The exemption request is denied for the following reasons: 1. VA Design Specification No. 2, Sheet Flow to Filter or Open Space, does not allow the local authority to waive filter strip width and maximum slope. 2. A verification of the adequacy of the on -site soil type, texture, and profile has not been provided (Spec. 2, Section 6.1, last bullet). If the required slope and dimensions can be achieved, amendment of soil may not be required if the soil sample demonstrates adequacy. Sin erely, Frank V. Pohl, PE, CFM County Engineer SHIiMP ENGINEERING, P.C. Design Focused Engineering May 26th, 2020 Frank Pohl County Engineer Albemarle County Department of Community Development 401 McIntire Road Charlottesville, VA 22902 Regarding: Stoudt Property — VSMP Exception Request — Vegetated Filter Strip Slope Requirement Dear Mr. Pohl, Pursuant to section 9VAC25-870-122 (Exceptions) of the state code and section 17-408 (Exception from the requirements of the VSMP) of the county code, we request that the VSMP authority grant an exception to a portion of the provisions of part IIB of the regulations for the Stoudt Property VSMP. The proposed Vegetated Filter Strip on the Stoudt Property meets all of the design specifications set forth in the DEQ Stormwater Design Specification No. 2 except for the requirements of Overall Length/Slope of the Vegetated Filter Strip and the requirements for Amended Soils. The area of the Vegetated Filter Strip is not intended to be disturbed during construction besides planting of the vegetation. Regrading the slope in this area and amending the soils will cause undue disturbance to the site. The site currently consists entirely of HSG B soils in the area of the filter strip and I can verify that the soil has adequate characteristics to allow for growth of the proposed plantings in the strip. Per Section 6.1 Compost Soil Amendments, the local plan approval authority may waive the requirements of compost amendments on HSG-B soils in order to receive credit as a filter strip. A gravel diaphragm has been provided upstream of the Filter Strip and a Pervious Berm has been provided downstream of the Filter Strip. The 10-ft area between the Gravel Diaphragm and the Filter Strip will be graded as shallow as possible with a grade between 3%-6% before entering the 30-ft Filter Strip. The provided 3%-6% slope will slow the runoff before entering the filter strip, protecting smaller bushes and shrubs from erosive flow. Dense planting within the Filter Strip will maintain slower flows, even as the slope approaches 12%. Once released from the filter strip, the runoff will be captured and slowed by the Pervious Berm. Note that per Table 2.3, the minimum length of the filter strip is 654 The proposed filter strip is only 30-ft within the planting strip and a total of 50-ft from the gravel diaphragm to the pervious berm. Due to the nature of the site, the flow from adjacent impervious areas is minor and travels through pervious turf before entering the gravel diaphragm. Therefore, the flow is far less intensive than would typically be handled for sheet flow from adjacent parking lots. In summary, the vegetated filter strip will provide adequate control of the runoff from the proposed site. As there is not an adjacent parking lot or significant impervious area directly above the strip, there is little concern about the ability to handle the flowrates and pollutants from the site. If you have any questions please feel free to contact me via e-mail at justin@shimp-engineering.com or by telephone at 434-227-5140. 'Dhirrgp'P.E. Engineering, P.C. Page 12 SIIII7PPNGA RA6. P. C. HSG ENGINEERING IANDPLANNING PROJECT MANAGEMENT 912 E HIGH ST PHONE: (434) 227-5140 CHARLOTTESVILLE, VA 22902 JUSTIN®SHIMP-ENGINEERING.COM LEGEND TURF MANAGED AREA LIMITS OF DISTURBANCE If '4g0 SOI LS (TYF) HSGB \� I 1 EXISTING / AME BAN '- ---1 ____--- ------ ` '-49� �_4 8, \ 8 --489, 1 `490� 00 1 00 / / MANAGED TURF LI M ITS OF ^49 4 4--`,\\ \ DISTURBANCE _,---- 496, l i `4g7 \--- � �\ 0.99 AC EXISTING �\ \� /'' ,_�� G' \\ \ \\ 1.5 //_a4�71 R,/ � AG \\ -,lFFE=498.0 8 \ \ I P L HSG B F4X. 2 STORY FR E HOUSE W/ BASE T FEE= / I / 499 i i l / ! / el 1CID Lithic Stoudt Handy IHSGB / ,l I�Agj I HSGB \__V �I \ ¢9''�'�-------- Pre -Development VKKM Map REVISED: 05- 1 2-2020 -----_-494---' • 1 • • i• _• SCALE: 1 • Pre -Re Development Land Cover (acres) A Soils B Soils C Soils D Soils Totals Forest/Open Space (acres) -- undisturbed forest o ens ace 0.00 (Managed Turf ( acres) -- disturbed, graded for yards or otherturf to be 0.99 0.99 Impervious Cover (acres) 000 0.00 0.99 SIIIMPEYNY PRING, P. C. ENGINEERING-L 4 YDPL4WN6 -PROJECT MANAGEMENT 1 HSG,$ / , / — _ i '/� 912 E HIGH ST PHONE: (434) 227-5140 CHARLOTTESVILLE. VA 22902 JUSTIN®SHIMP-ENGINEERING.COM LEGEND TURF MANAGED AREA LIMITS OF DISTURBANCE IMPERVIOUS AREA � � / �/ , ;) I //1/�` ./ //_i' /,.---489 �\\\ �\\ \\\ � ___''03 ice— —_' '/ ■ SO 1 LS (TYP) ��. EXISTING I I - AM gq N` �___ - ___--- -----• / IHSG u 4g3,\ LIMITS OF DISTURBANCE --____ / -495 496, EXISTING IMPERVIdU9 1.5 STA�j-Y- \ �� \`.`, --- % j c4g6J' �/, _ 4 71 RgME/XRAGE FFE=498.0 HSGA SWIMMING POOL DOES 1 I J I 1 a, E�X 2 STORY FR E NOT OUTLET OFFSITE. _-- 1 yOUSE W/ BASE T NOT CONSIDERED . '' 4 —IOW! FEE= J �198� M ERV OUS IN VRRM SPREADSHEET •� �, 49g Lithic Stoudt Handy HSGB to ;I Post -Development VKF,M Map HSGB / )�¢9) j HSGB �_ < �' � �\ '� ; REVISED: 05- 12-2020 If ( ,, 50 100 A 150 Post -Development Land Cover (acres) ASoils BSoils CSoils DSoils Totals Forest/Ope n Space (acres) -- and isturbe d, rotectedforest/o ens ace or reforested 0.00 Managed Turf ( acres) -- di stu rbe d, graded for yards or otherturf to be 0.87 D.87 Impervious Cover (acres) 0.12 1 0.12 Area Check OK. OK_ OK. OK. D.99 / SIIIVIPPNUNPPRIN6 PC j6� ENGINEERING -L 4NDFLANNIN6 -PROJECT MANAGEMENT 912 E HIGH ST PHONE: (434) 227-5140 VEGETATED L. O D CHARLOTTESVILLE, VA 22902 JUSTIN®SHIMP-ENGINEERING.COM FI LTEK 5TKI P �' /.'' '/\\ \ \\\\ \ �\\4,8�__`V__� _ / �' /,.� LEGEND — — / IMPERVIOUS AREA \ /r` `' ' \/ / �+ / •• '/ // �' \ \ \ \ '' � TURF AREA IN L.O.D DRAINAGE AREA IN L.O.D. \ - ___ 3 - -' � ® TO BUI=I=EK= O.G7 AC AREA NOT TABULATED (VRRM) - 48 - o0 x ,-' ----- / ./''•�; / / ` �_�'--� - ice- LIMITS OF DISTURBANCE (L.O.D) �i •f�• / (0.5 G AC TU RI= AND `� ¢8s,, ��' _ _ �` � �,,----,,-- ��--- DRAINAGE AREA TO BUFFER ��k ��- • / 0. 1 I AC IMP) I / -1L to / •' �• / +C° � �+ �. TOTAL DRAINAGE AREA +k�++ A+Ar � + + :� TO BUI=I=EK= 1.24 AC ++�+ } (DRAINAGE AREA A) + + — — — — + +, v \ + v � v qv v--- AREA NOT TABULATED \\ \ ■ / �+ ++ + /++ {o�vv00000FOR VRRM NUTRIENT \ \ ' \ + + I+ v v v v v v v ----_- \ \ �� + , ++ + + + ++: a o v v q v v REDUCTION -' ' �' 1 +AN + + 4 7/v v, v d'v v v v ri v v ' EXISTING i LL _ + + + 1 17 vl v V, v v v v/f7 v vt 1.5 ST �jj -Y A- v �7 7 v v zbv/v v v /��f4971 R9ME ' AG / + ++ + + + ++ I+� + i .jv vl vl v v 1V<ZZ v v v v (/ I �,� FFE=498.0 + + '+ + + +./+1C7v��Zvvv�\Vvvvv /' +� + ++++ ++ ++++i ' Ar —480- % + ++ + + ++ +/ + + ++ + + o v v\ v d° v b v v /'7 v v v + + /++ + �+ dvv�v�v47v�vvvv + #v + + +%'� . v v v v v �vv v EIS 2 STORY FR E BLANK AREA NOT �+ ,+ + ••+' ouSE w BASE T ''-- NCLUDED IN BUFFER / % ; + + �� °'�° ° ° ° ° ° ° °Jiff P° FEE= +� �1v j/E7vvvvv °°vLithic 5toudt Handy DRAINAGE AR. % ��'�°�6v°°°°°d°°°'b\ • i°° ° ° ° ° ° ° ° ° °'� Ve etated Filter Strip Draina e Ma (POOL DOES NOT :/ ,�f' �vvvv vvvvo'vv'G�v�vv�vvvo' 499 j p v v v v v v v v�,7 V V N, v.,V. V V \ v v v s�� / REVI5ED: 05- 1 2-2020 vvvvva'vvv vvlv19vvv vvv OUTLET TO BUFFER) I I I • ^�vvs7-5vvvv,vvv�bvivvvvwva� `.� \ � �rf v v v v v v,/v v v v v \i p ° ° cb QI \ 00 Drainage Area A Land Cover (acres) 7�/vvvvvv,bv� '-- - - -\/ 496'�\----------- 496-- �o,`�- -494 - A Soils B Soils C Soils D Soils Totals Land Cover Rv Forest/Open Space (acres) 0.00 0.00 Managed Turf(acres) 0.56 0.56 0.20 Impervious Cover (acres) 0.11 0.11 0.95 Total 0.67 Filter/Open9. Sheetf low to 9.a. Sheetflow to Conservation Area, A/B Soils 75 (Spec #2) 9.b. Sheetflow to Conservation Area, C/o Soils (Spec #2) 50 9.c. Sheetflow to Vegetated Filter Strip, A Soils or Compost Amended B/C/D Soils 50 0.56 0.11 (Spec #2 & #4) 5/26/2020 Centralized Payments (D Your Payment Was Submitted Transaction ID: Transaction Time: Total Paid: 7SL602859W842352X 05/26/2020 11:38 AM $246.46 We will receive notification of your online payment at the time that it is made and we will credit your payment as of that day. 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