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Home My WebLink AboutWPO201800056 Correspondence WPO VSMP 2018-11-29C: � \I// i %1P_NTECH6 ENGINEERED SOLUTIONS November 29, 2018 Lawrence Osborne III Bohler Engineering 28 Blackwell Park Lane, Suite 201 Warrenton, VA 20186 RE: Review of the 60" CMP Detention System for Wawa — 3267 Proffit Road Contech Engineered Solutions LLC 7037 Ridge Road, Suite 350 Hanover, MD 21076 Phone: (866) 740-3318 Fax: (866) 376-8511 www.ContechES.com The purpose of this letter is to document for Albermarle County Contech's review of the design and proposed application of the CMP detention system for the above -referenced project. Based on our review, we believe CMP is an appropriate detention solution for this site. The engineer of record reports a required storage volume of 7,757 cf for the system. To store this volume, the system requires (4) rows of pipe with (2) header manifolds. The configuration of the CMP inlet and outlet pipes is acceptable. The internal flow controls will limit flow to the downstream treatment system and provide overflow bypass for peak storm events. The system appears to be constructible and is located in order to facilitate maintenance activities. Access risers have been added to the system in locations to allow for full maintenance of the system. The system is designed with zero slope; this is an acceptable design and will not negatively impact the system performance. In summary, this system is expected to operate in accordance with Contech Engineered Solutions' design intent. Please feel free to contact me if you have any questions or concerns. Sincerely, John Wright Contech Engineered Solutions LLC jwright@conteches.com • TM 28 Blackwell Park Lane,Suite 201 H L E R Warrenton,VA 20186 PHONE 540.349.4500 . 1 \ i October 10, 2018 Via Federal Express Albemarle County Department of Community Development 401 McIntire Road, Room 227 Charlottesville,VA 22902-4596 Attn: David James Re: WP02018-00056 Virginia Stormwater Management Plan — 1st Review Response Wawa Seminole Trail&Proffit Road Charlottesville, VA 22911 Albemarle County BE#V162083 Dear Mr. James: Bohler Engineering is pleased to submit on behalf of Renaud Consulting, the 2' Submission Virginia Stormwater Management Plan for the Wawa Project in Charlottesville, Virginia. The following is our comment response letter addressing comments received from your department dated August 14, 2018. Each comment is addressed and responded to as follows: A. Stormwater Pollution Prevention Plan(SWPPP) Comment 1: Complete items 8 & 12 of the Registration Statement. Response 1: The registration statement has been updated with the following information: a. 8. Project start and completion dates: 11/2018—11/2019 b. 9. Item was completed(Development and disturbed areas were listed as 1.52, and 1.83 respectively). The disturbed acreage has been revised to be 1.92 acres. c. 10.Item was completed(Not part of larger development,no was checked) d. 11.Item was completed(A draft SWPPP has been prepared) Comment 2: Insert copy of General Permit coverage when obtained. Response 2: A copy of General Permit Coverage will be included once it is approved. Comment 3: Provide a PPP exhibit sheet(to be updated in the field). Response 3: A PPP sheet has been provided with the SWPPP and can be found on Sheet #6 of the WPO plan excerpts provided in Appendix E. Comment 4: When ready provide(2) copes of updated SWPPP. Response 4: Two copies of the updated SWPPP have been provided. CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM • B O H L E RM David James [ t s• Wawa Virginia Stormwater Management Plan 1"Review Response October 10,2018 Page 2 of 6 B.Pollution Prevention Plan (PPP) Comment 1: Show any proposed clearing/grading activities,paving operations, landscaping operations, E&S controls, staging, stockpile, borrow, fueling, waste disposal, vehicle/equipment washing, concrete washout locations on the PPP. Response 1: The landscape plan has been added to this submission to show landscape improvements, see Landscape Plan sheet. C. Stormwater Management Plan(SWMP) Comment 1: Cover sheet: Add the WPO number to title: WP0201800056; Remove signature block (not needed for WPO); Update Sheet Index. Response 1: The WPO number has been added, see Sheet#1. Comment 2: Please include the SWM and Storm computations sheets in the plan set; C-403 to C-503 sheets that were on the site plan. Response 2: Sheets C-403 & C-503 have been added to SWMP plan, see SWM & BMP Computation Sheets. Comment 3: Show existing conditions sheet with existing drainage divides. Response 3: The Erosion and Sediment Control Plan Phase I & Pre-Developed Drainage Plan sheets contain the existing site features and existing drainage divides. These sheets have been updated and reviewed for clarity. Comment 4: One or more actions may be required(to be determined): Removal of existing stormwater facility(SWF)on adjacent property may require the adjacent property owner to submit a VSMP plan amendment. The easement for the SWF may need to be vacated. A boundary line adjustment plat may need to be submitted/reviewed/approved prior to VSMP approval. Response 4: Of the items potentially required; there is not an existing easement for the SWF that would require vacation. A BLA is being submitted under separate cover and will be approved prior to VSMP approval. Comment 5: Submit a SWM maintenance agreement (see below). Response 5: An SWM maintenance agreement will be submitted with Final Site Plan Submission. Comment 6: Purchase of nutrient credits required before the VSMP plans can be approved. Please contact Ana Kilmer regarding nutrient credit purchase and required documentation. Response 6: Nutrient Credit approval is being coordinated with Ana Kilmer and Affidavit of purchase will be provided prior to issuance of occupancy. Comment 7: Show a SWM facility easement' for the proposed underground detention system. Required width: 10'+(pipe dia. or channel width)+2' +2(depth-5'). Show drainage easement for proposed pipes/channels(outside or ROW)which carries water through site from offsite. {Design Manual, section 6} Response 7: SWM Vault ESMT has been added, see SWM and BMP Computations sheet and concurrent Easement Plat. CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM s+ B O H L E R David James I Wawa Virginia Stormwater Management Plan 1st Review Response October 10,2018 Page 3 of 6 Comment 8: Submit a Deed of dedication and easement&Plat for the SWM facility(UD system). Response 8: An Easement Plat has been submitted for review under separate cover. The Deed of Dedication will be provided prior to Site Plan approval. Comment 9: Provide details on UD system including profile and cross-section showing pipe and manhole openings, orifice and weir locations and dimensions. Show material, lining, bedding, cover details& dimensions. Response 9: Vault details and profiles have been updated to provide the requested information, see Utility Profiles and SWM and BMP computations sheets. Comment 10: Sheet C503: Show the culvert/orifice&weir locations on the profiles. Show height of the W.S.E. for the design storms. Response 10: The profiles have been updated to provide the requested information, see Utility Profiles sheet. Comment 11: Provide Hydraflow report of the pre/post watershed model schematic, and report of pre/post hydrograph summary. Response 11: The Hydraflow schematic plan and hydrograph summaries have been added, see SWM and BMP Computations sheets. Comment 12: Can you provide computations on how the Q values were obtained on the pre&post development plan(sheets C402& C403)?There appears to be some discrepancy between the Q values shown on the hydrographs(C404 to C407). Response 12: Per conversation on 8/23 with County Staff Engineer - David James, it was determined that erroneous hydrographs were present on the SWM and BMP Computations sheet. Erroneous hydrographs have been removed, see SWM and BMP Computations sheets. Comment 13: Sheet C408 —Show the Energy Balance equation solved for each POI and total site. Response 13: Energy Balance equations have been revised, see SWM and BMP Computations sheets in coordination with email correspondence on 8/30 with County Staff Engineer — David James. As described in the SWM narrative; water routed to the proposed underground detention system over detains the post developed site to meet the improvement release rates required by Energy Balance for the 1 year storm as computed in the Energy Balance table provided. Additionally, the 1 year pre- developed flow for POI 1 hydrograph and the Time of Concentration computation are provided in the SWM and BMP Computations. Comment 14: Use the NOAA Atlas 14 for precipitation/intensity values for the 1-,2-,10-yr storms (C409) https://hdsc.nws.noaa.gov/hdsc/pfds_printpage.html?lat=3 8.13 24&lon=78.4344&data=de pth&units=english&series=pds Response 14: Per conversation on 8/23 with County Staff Engineer — David James, it was discussed that rainfall intensities used on the 1st submission are within 0.02 in/hr of current NOAA values and are NOAA rainfall intensities from April, 2017. County Engineer deemed the values used with the 1st Submission as acceptable because they are more conservative, and the revision would result in a negligible change. Subsequently,intensities have not been revised. CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM • PA BO H L E R David James iNt Wawa Virginia Stormwater Management Plan 1st Review Response October 10,2018 Page 4 of 6 Comment 15: Provide MH access to UD pipe at STM B-1 location. Response 15: A manhole has been added at STM B-1, see Utility Plan Sheet. Comment 16: Provide maintenance requirements for the UD system on the plans. Response 16: Vault maintenance requirements have been added to the plan, see SWM and BMP Computations sheet. Comment 17: Provide typical section, lining type requirements & design calcs. for the ditch alongside Proffit Road. Response 17: The proposed grading scheme creates a berm between the site and ROW. The offsite water that is conveyed to the ROW is carried via sheet flow into the existing gutter pan on Proffit Road. A ditch is not proposed or existing along the Northern side of Proffit Road. D. Erosion and Sediment Control Plan(ESCP) Comment 1: Show existing conditions sheet with existing drainage divides. Show all existing easements with deed book references, locations and dims. Response 1: The Erosion and Sediment Control Plan Phase I & Pre-Developed Drainage Plan sheets contain the existing site features and existing drainage divides. These sheets have been updated and reviewed for clarity. Existing easements have been added, please see Erosion and Sediment Control Phase I,and Grading Plan sheets. Comment 2: Show area of existing stormwater facility to be removed(tbr). Response 2: The area of the existing stormwater facility to be removed is now called out on the Erosion and Sediment Control Plan Phase 1, and Pre-Developed Drainage Plan sheets. Comment 3: Show off-site disturbances in an easement. Response 3: Proposed Temporary Offsite Construction Easements are now provided, see Grading Plan sheet. Comment 4: Show existing right-of-way lines and EOP labeled. Response 4: Additional labels have been added to the ROW and EOP for clarity, see Demolition Plan sheet. Comment 5: Note: Contractor can't demo pavement, or grade until E&S perimeter controls are in place(phase 1). Response 5: The requested note has been added, see Sheet Erosion and Sediment Control Plan Phase 1,Note#3. Comment 6: Show proposed street name and ROW line. Show portions of sight distance in an easement if outside of ROW. Response 6: There are no proposed streets or ROW lines. Sight distance easements have been added, see Grading Plan sheet. Sight Distance profiles are provided with concurrent FSP submission. CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM BO H L E 1` David James Wawa Virginia Stormwater Management Plan Pt Review Response October 10,2018 Page 5 of 6 Comment 7: Proposed slopes greater than 3:1 to have low maintenance (not grass) ground cover specified on plans, which will not require mowing. {Design Manual, section 8} Response 7: Low maintenance ground cover is now specified in sloped areas greater than 3:1, see Landscape Plan sheet. Comment 8: The county requires a paved construction entrance. Provide this detail on the details sheet {Design Manual, section 3F}: Response 8: The requested detail has been added to the Erosion and Sediment Control Details sheet. Comment 9: Diverting runoff to an existing inlet that is proposed to be raised to final grade will not be allowed. Runoff must go to a sediment trap or similar. Response 9: Per conversation on 8/23 with County Staff Engineer — David James, it was discussed that this proposed erosion control measure would be a standpipe and would utilize plate 3.07-1, which is provided on the Erosion and Sediment Control Details Sheet. Comment 10: Callout the type of IP needed, i.e. for STM EX-02, and provide a detail (ESC HB, Spec. 3.07). Response 10: Plate 3.07-1 is now provided on the Erosion and Sediment Control Details sheet. Comment 11: Show dust control symbols (DC) for phase II. Response 11: Per conversation on 8/23 with County Staff Engineer — David James, it was discussed that the scale of this project did not warrant dust control delineation on the civil plans. However, the Erosion and Sediment Control notes sheet provides direction to the contractor on treatment of disturbed soils that are left denuded for longer than seven (7) days that will suffice for contractor direction for mitigation of dust control. Comment 12: Show temporary seedling symbols (TS)where needed. Response 12: Per conversation on 8/23 with County Staff Engineer — David James, it was discussed that the scale of this project did not warrant temporary seeding. However, the Erosion and Sediment Control notes sheet provides direction to the contractor on treatment of disturbed soils that are left denuded for longer than seven(7) days that will suffice for contractor direction for mitigation of dust control. Comment 13: Show existing vegetation to be saved with (TP) symbols. This must match any landscaping plans. Response 13: The existing vegetation to be preserved with tree protection have been checked to ensure consistency with the Landscape Plan sheet. Comment 14: `Gutter buddy' use needs variance approval (let Frank Pohl, County Engineer know). Response 14: A variance request for the Gutter Buddy erosion control measure is currently being coordinated with Frank Pohl as requested and will be approved prior to VSMP approval. CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOH LERENGINEERI NG.COM BO H L E R David James Wawa Virginia Stormwater Management Plan 1st Review Response October 10,2018 Page 6 of 6 Should you have any questions regarding this project or require additional information, please do not hesitate to contact me at(540) 349-4500. Sincerely, Bohl= n eeri LLC onathan Q. Ritchie, P.E. JR/jb/bb H:\16\V162083\Administrative\Letters\181010 Virginia Stormwater Manageme 'Ian 1st Review CRL.doc CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOH LERENGINEERI NG.COM • rii28 Blackwell Park Lane,Suite 201 NO ENGINEEWarrenton,VA 20186 pp�] fY PHONE 540.349.4500 November 30, 2018 Via Federal Express Albemarle County Department of Community Development 401 McIntire Road, Room 227 Charlottesville,VA 22902-4596 Attn: David James Re: WP02018-00056 Virginia Stormwater Management Plan —2nd Review Response Wawa Seminole Trail&Proffit Road Charlottesville,VA 22911 Albemarle County BE#V162083 Dear Mr. James: Bohler Engineering is pleased to submit on behalf of Renaud Consulting, the 3rd Submission Virginia Stormwater Management Plan for the Wawa Project in Charlottesville, Virginia. The following is our comment response letter addressing comments received from your department dated November 9, 2018. Each comment is addressed and responded to as follows: A. Stormwater Pollution Prevention Plan(SWPPP) Comment 1: (Rev.1)Complete items 8 & 12 of the Registration Statement. (Rev.2) Correct item 3; the long and lat coordinates are reversed. Correct item 9, the total land area of development should be 1.92 ac. Response 1: Items 3 and 9 have been corrected and the revised Registration Statement is included with this submission. Comment 3: (Rev.1)Provide a PPP exhibit sheet(to be updated in the field). (Rev 2) Remove PPP from WPO plan set and insert in SWPPP. I was looking for an exhibit sheet to be inserted into the SWPPP. See the County's SWPPP format we use here: http://www.albemarle.org/upload/images/forms_center/departments/Community_ Develoment/forms/Engineering and WPO_Forms/Storm water_Pollution Prevention Pl an_SWPPP_template.pf — Response 3: A PPP exhibit has been prepared as directed and included with the SWPPP. Comment 4: (Rev.1)When ready provide(2)copies of updated SWPPP. (Rev 2)See comment#3 above on SWPPP. Response 4: Two copies have been provided with this application. CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM -(") ‘ B O H L E 1 David James C; Wawa Virginia Stormwater Management Plan 2nd Review Comments November 30,2018 Page 2 of 5 B.Pollution Prevention Plan (PPP) Comment 1: (Rev.1) Show any proposed clearing/grading activities, paving operations, landscaping operations, E&S controls, staging, stockpile, borrow, fueling, waste disposal, vehicle/equipment washing, concrete washout locations on the PPP. (Rev.2) I was looking for a map of these potential sources The PPP doesn't show/ref clearing/grading activities, paving operations, E&S controls, staging, stockpile, borrow, fueling, waste disposal, vehicle/equipment washing, . Some of these areas will need E&SC controls (i.e. stockpiles), or to be located away from inlet (i.e. chem/fueling areas). Response 1: The requested PPP exhibit has been included with the revised SWPPP. C. Stormwater Management Plan(SWMP) Comment 4: (Rev.1) One or more actions may be required (to be determined): Removal of existing stormwater facility (SWF) on adjacent property may require the adjacent property owner to submit a VSMP plan amendment. The easement for the SWF may need to be vacated. A boundary line adjustment plat may need to be submitted/reviewed/approved prior to VSMP approval. (Rev.2) Not addressed. Submit a plan amendment to WP0201100017 to be approved prior to this VSMP plan approval. The plan will be amended to show nutrient credits replacing the bioretention. Nutrient credit purchase for adjacent parcel & will need to have it's own affidavit. Response 4: Please note coordination regarding a WPO plan amendment is ongoing. Comment 5: (Rev.l) Submit a SWM maintenance agreement(see below). (Rev.2) Not addressed. SWM maintenance agreement required prior to VSMP plan approval. Response 5: A draft Agreement to Maintain Stormwater Management Facilities and Other Techniques has been included with this submission. Comment 6: (Rev.!) Purchase of nutrient credits required before the VSMP plans can be approved. Please contact Ana Kilmer regarding nutrient credit purchase and required documentation. (Rev.2) Purchase of nutrient credit require prior to VSMP approval. Please work with Ana Kilmer on the nutrient credit purchase. -Currently, 1.58 cr. needed for TP Response 6: Preliminary coordination has been established with Ana Kilmer and we are actively working to facilitate nutrient credit purchase affidavits. CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM ' B0H LER David James I. i. t \ 1.. tt 1 *I G Wawa Virginia Stormwater Management Plan 2nd Review Comments November 30,2018 Page 3 of 5 Comment 7: (Rev.1) Show a `SWM facility easement' for the proposed underground detention system. Required width: 10'+(pipe dia. or channel width) + 2'+ 2(depth-5'). Show drainage easement for proposed pipes/channels (outside of ROW) which carries water through site from offsite. {Design Manual,section 6} (Rev.2) Not addressed. Show a 10' (Min) offset `equipment landing' for the SWF easement around facility. Also show a 20' (Min) SWF easement around the outfall structures of facility that extend to the edge of property Refer to sketch - The highlighting extends to STM EX-A4 &STM E-6(Yellow highlighter shows public drainage easement/ Blue shows SWM facility easement). r r t. ., 1 ,.r . •• t I y �„'.:- a / . '« T -' iin 1 I • -Ny ' 4 Wa Wa ' -ii 1 • a 1, • 1 a y r w r .. ,� - tF-. a • l fin• • ( j , (a � , J _ ,�. y,,, . ,....4. T t , off p ` # ; tea.. tpi {` . - . r , -A.. t 4 ♦ "U , t Response 7: Per the Design Manual Section 6 computation provided above with the pipe diameter equaling 5' and the depth equaling 8' the required easement width is 10'+(5')+2' +2(8'-5')=23'. A 23' SWF easement has been provided. As coordinated with County staff, a 20' public stormwater easement has been added from Structures A-1 to EX-A4 to the property line. Additionally, a 20' public stormwater easement has been added to storm pipe run E-6 to E-1. Comment 8: (Rev.1) Submit a Deed of dedication and easement & Plat for the SWM facility (UD system). (Rev.2) Thanks, the easement plat has been reviewed and there are requested changes. When the plat is near approval the deed of dedication will be sent to the owner/representative to sign. Deed&plat to be recorded prior to VSMP approval. Refer to sketch. Response 8: Acknowledged,the revised easement plat will be updated accordingly. CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM B0H LEA David James t. N G I N 1. t R I N (; Wawa Virginia Stormwater Management Plan 2nd Review Comments November 30,2018 Page 4 of 5 Comment 9: (Rev.1) Provide details on UD system including profile and cross-section showing pipe and manhole openings, orifice and weir locations and dimensions. Show material, lining, bedding, cover details&dimensions. (Rev 2)Partially addressed. Show some slope to ensure positive drainage to outlet. In the profiles show invert on UD pipe/s Add access ladders for access MHs to UD. Response 9: A slope within the Underground Detention system will alter the release rate of the system. A certification letter has been provided by Contech ensuring the adequacy of the vault design and pipe system with a slope of 0%, see Storm Computations sheet. Comment 12: (Rev.1) Can you provide computations on how the Q values were obtained on the pre & post development plan (sheets C402 & C403)?Not Addressed. There appears to be some discrepancy between the Q values shown on the hydrographs (C404 to C407). Addressed. (Rev.2) Show Tc line on sheets 8 & 9. Show/Define what `Ult 1' & `Ult 2'in the Energy Balance Equ (Sheet 16) are, and show on map (Sheets 8 & 9). Response 12: A time of construction (TOC)path has been provided on sheet 8 for POI 1, all other POI's have a minimum TOC of 5 minutes. Time of concentrations for post development are computed with a minimum TOC of 5 minutes due to proposed site conditions. Comment 13: (Rev.1) Sheet C408 — Show the Energy Balance equation solved for each POI and total site. (Rev.2)Refer to above comment. Response 13: Please note an email correspondence with David James on 8/30/2018 stated the following: "Yes, that comment is satisfied. Just provide calculations/analysis of how you determined Qpre,and show the Energy Balance equation being solved for the POI 1." Calculations for the Q pre developed for POI 1 are shown on the SWM Plan utilizing the area,and CN provided. The Energy Balance table computes the required flow for POI 1. Additional updates to the energy balance table for clarity have been made revising the POI 2 designation to undetained. The undetained area includes all area within the limits of disturbance that is not captured in POI 1, as detailed in the SWM narrative on the SWM Computations sheet. Comment 16: (Rev.1)Provide maintenance requirements for the UD system on the plans. (Rev.2) I can't find the sheet showing maintenance requirements Provide maintenance requirements and also installation/inspection requirements. Response 16: Maintenance Requirements for the underground system have been provided on the SWM and BMP computations sheets. Comment 18: (Rev.2) Trench drains - Show dimensions in the details (Include a Stormwater/Drainage Structure Details sheet), show profiles (sheet 15), and correct design (sheet 16) to match plan. Response 18: Trench drains have been adequately sized, and profiled. The corresponding details have been provided on the Construction Details sheet. CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM BO H L 1`, R David James E G t E t. R 1 N t; Wawa Virginia Stormwater Management Plan 2nd Review Comments November 30,2018 Page 5 of 5 Comment 19: (Rev.2)Add VSMP As-built list to the plan: http://www.albemarle.org/upload/images/formscenter/departments/Community_Develop ment/forms/Engineering_andWPO_Forms/WPO_V SMP_C onstruction_Record_Draw ings_Policy_23May2014.pdf Response 19: The VSMP As-Built list has been added to the Erosion and Sediment Control Details. D.Erosion and Sediment Control Plan(ESCP) Comment 14: (Rev.1) `Gutter buddy' use needs variance approval (let Frank Pohl, County Engineer know). (Rev.2)Acknowledged. Gutter buddy approved. Add the standard IP detail (VESCP HB, Spec. 3 07) in case gutter buddies fail or doesn't function properly. Response 14: The standard inlet protection detail has been added to the Erosion and Sediment Control Details sheet. Should you have any questions regarding this project or require additional information, please do not hesitate to contact me at(540) 349-4500. Sincerely, Bohle• n eerin A LC /nathan Q. Ritchie, P.E. JR/jb/bb H:\16\V 162083\Administrative\Letters\181 130 Virginia Stormwater Management an 2nd Review CRL.doc CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM TM � r< ° BoHLER. 28 Blackwell Park Lane,Suite 201 Warrenton,VA 20186 PHONE 540.349.4500 N I' I R IN € , March 5, 2019 Via Federal Express Albemarle County Department of Community Development 401 McIntire Road, Room 227 Charlottesville,VA 22902-4596 Attn: David James Re: WP02018-00056 Virginia SWMP—3rd Review Response Wawa Seminole Trail&Proffit Road Charlottesville, VA 22911 Albemarle County BE#V162083 Dear Mr. James: Bohler Engineering is pleased to submit on behalf of Renaud Consulting, the 4th Submission Virginia Stormwater Management Plan for the Wawa Project in Charlottesville, Virginia. The following is our comment response letter addressing comments received from your department dated January 3, 2019. Each comment is addressed and responded to as follows: A. Stormwater Pollution Prevention Plan(SWPPP) Comment 1: (Rev.1) Complete items 8 & 12 of the Registration Statement. (Rev.2) Correct item 3; the long and lat coordinates are reversed. Correct item 9; the total land area of development should be 1.92 ac. (Rev.3) Partially addressed. The off-site area is to be included, so 1.92 ac. for both entries on item 9. The information for the off:site area (MJ Outpatient center) should be filled in for item 3. Response 1: Registration Statement has been revised accordingly. Disturbed area has been revised to 1.95 acres to incorporate VDOT and County comments. Comment 2: (Rev.1) Insert copy of General Permit coverage when obtained. (Rev.2/3) Comment still valid. Response 2: General Permit coverage will be provided once obtained. CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM B O H L E R David James Wawa Virginia Stormwater Management Plan 3rd Review Comments March 5,2019 Page 2 of 3 Comment 3: (Rev.1)Provide a PPP exhibit sheet(to be updated in the field). (Rev.2) Remove PPP from WPO plan set and insert in SWPPP. I was looking for an exhibit sheet to be inserted into the SWPPP. See the County's SWPPP format we use here: http://www.albemarle.org/upload/images/forms center/departments/Community Develo pment/forms/Engineering and WPO Forms/Stormwater Pollution Prevention Plan S WPPP template.pdf (Rev.3) Partially addressed. Please submit PPP separate from the WPO plan. It's to be part of the SWPPP and updated in the field with any changes. Response 3: The PPP sheet has been removed from the plan and the corresponding sheet has been left intentionally blank. The PPP has been provided separately and within the SWPPP package. B.Pollution Prevention Plan(PPP) Comment 1: (Rev.1) Show any proposed clearing/grading activities, paving operations, landscaping operations, E&S controls, staging, stockpile, borrow, fueling, waste disposal, vehicle/equipment washing, concrete washout locations on the PPP. (Rev.2) I was looking for a map of these potential sources. The PPP doesn't show/ref. clearing/grading activities, paving operations, E&S controls, staging, stockpile, borrow, fueling, waste disposal, vehicle/equipment washing, concrete wa"ho t locations. Some of these areas will need E&SC controls (i.e. stockpiles), or to be located away from inlet (i.e. chem/fueling areas). (Rev.3) Partially addressed. I don't see mention about clearing/grading activities, E&S controls, and paving operations. Response 1: As discussed with David James on 11/28/18, clearing and grading activities; E&S controls; and paving operations information are provided on the E&S Control Plans and E&S Control notes sheets. C. Stormwater Management Plan(SWMP) Comment 4: (Rev.1) One or more actions may be required (to be determined): Removal of existing stormwater facility (SWF) on adjacent property may require the adjacent property owner to submit a VSMP plan amendment. The easement for the SWF may need to be vacated. A boundary line adjustment plat may need to be submitted/reviewed/approved prior to VSMP approval. (Rev.2) Not addressed. Submit a plan amendment to WPO201100017 to be approved prior to this VSMP plan approval. The plan will be amended to show nutrient credits replacing the bioretention. Nutrient credit purchase for adjacent parcel & will need to have it's own affidavit. (Rev.3)Not currently addressed—to be addressed prior to plan approval. Response 4: Plan Amendment to SDP 2009-00034 was submitted for review on 1/8/19. Nutrient Credit Affidavit of Purchase will be acquired prior to VSMP plan approval. Comment 5: (Rev.1) Submit a SWM maintenance agreement(see below). (Rev.2) Not addressed. SWM maintenance agreement required prior to VSMP plan approval. (Rev.3) Owner to work with Ana Kilmer on completing the agreement. Response 5: SWM maintenance agreement will be coordinated prior to VSMP plan approval. CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM BO H L E R David James Wawa Virginia Stormwater Management Plan 3rd Review Comments March 5,2019 Page 3 of 3 Comment 6: (Rev.1) Purchase of nutrient credits required before the VSMP plans can be approved. Please contact Ana Kilmer regarding nutrient credit purchase and required documentation. (Rev.2) Purchase of nutrient credit require prior to VSMP approval. Please work with Ana Kilmer on the nutrient credit purchase. -Currently, 1.58 cr. needed for TP (Rev.3)Acknowledged. Owner to work with Ana Kilmer on the nutrient credit purchase. Response 6: Nutrient credit purchase agreement and affidavit of sale will be coordinated prior to VSMP plan approval. Comment 8: (Rev.1) Submit a Deed of dedication and easement & Plat for the SWM facility (UD system). (Rev.2) Thanks, the easement plat has been reviewed and there are requested changes. When the plat is near approval the deed of dedication will be sent to the owner/representative to sign. Deed & plat to be recorded prior to VSMP approval. Refer to sketch. (Rev.3)Acknowledged; Currently under review. Response 8: Acknowledged. Comment 16: (Rev.1)Provide maintenance requirements for the UD system on the plans. (Rev.2) I can't find the sheet showing maintenance requirements. Provide maintenance requirements and also installation/inspection requirements. (Rev.3) Sheet 4 - The text on the print out for the maintenance of the detention system is somewhat illegible. Same for the vault details on Sheet 13. Increase overall size? Comment addressed otherwise. Response 16: Size of the maintenance requirements and vault details have been increased for legibility. Should you have any questions regarding this project or require additional information, please do not hesitate to contact me at(540) 349-4500. Sincerely, Bohle• n u;,eerin A LC .nathan Q. Ritchie,P.E. JR/jb H:\16\V 162083\Administrative\Letters\190305 Virginia Stormwater Management an 3rd Review CRL.doc CIVIL AND CONSULTING ENGINEERS • PROJECT MANAGERS • SURVEYORS • ENVIRONMENTAL CONSULTANTS • LANDSCAPE ARCHITECTS WWW.BOHLERENGINEERING.COM David James From: Lawrence Osborne III <losborne@bohlereng.com> Sent: Wednesday, November 28, 2018 9:28 AM To: David James; Frank Pohl Cc: V162083@nf.bohlereng.com;Jonathan Ritchie Subject: RE:Wawa Proffit - ENGE Comments David, Our outstanding question relating to comment#7.B. is detailed below. Comment: STM E-6 and outfall appears to be receiving water from the public road and therefore should be in a public easement. Structures E-6 and E-5 receive a total of 0.10 acres of impervious from the right of way,which is predominantly the required proposed turn lane area. The total drainage to the proposed underground detention system is 1.67 acres. If this water is bypassed to POI 4 the site will not meet energy balance and therefore needs to be detained. If an easement will be required for the E-6 to E-1,there will be numerous conflicts with the easement listed below. We would like to explore if there is any alternative to proposing an easement for this entire run of pipes (E-6 to E-1), considering the minimal area contribution to the system. • Proposed retaining wall located near structures E-3 and E-2 • Proposed landscaping near proposed pipe run E-4 to E-3 required by ARB. • Proposed light poles near proposed pipe run E-4 to E-3, required for general site lighting requirements Additionally, I've reached out to Contech about the slope comment on the detention system and will follow up as soon as I hear back. Thanks, Lawrence Osborne III '.: BOH LER ''i r, ` I. I. It I N. <: 28 Blackwell Park Lane, Suite 201 I Warrenton,VA 20186 P: 540-349-4500 I losborne@bohlereng.com www.BohlerEngineering.com Yt4 fiNI;ILA at ISEST ila6E5 TO Wokr Confidentiality Note This e-mail,and any attachment to it,contains confidential information intended only for the use of the designated recipients, which information may also be privileged.If the reader of this e-mail is not the intended recipient, the document has been received in error and any use,review,dissemination,distribution, disclosure or copying of this message is strictly prohibited If you have received this e-mail in error,please notify the sender via reply e-mail and immediately delete this e-mail from your system. From: Lawrence Osborne III Sent: Monday, November 26, 2018 5:56 PM To: 'David James'<djames@albemarle.org> 1 a Cc:V162083@nf.bohlereng.com Subject:Wawa Proffit- ENGE Comments Good Evening David, I've reviewed the 2"d Submission comments for Wawa and wanted to discuss the following comments at your earliest convenience. Please give me a call when you are available. I will be out of the office from 12-3pm tomorrow but will be available the rest of the day. FSP Comment#7 Comment#11 Comment#14 Comment#23 Comment#24 VSMP SWMP Comments Comment#7 Comment#9 Comment#18 Thanks, Lawrence Osborne III, EIT I Sr. Design Engineer BOHLER F N C: 1 N F f; R t N to 28 Blackwell Park Lane, Suite 201 I Warrenton,VA 20186 P: 540-349-4500 I losborne@bohlereng.com www.BohlerEngineering.com Confidentiality Note This e-mail,and any attachment to it,contains confidential information intended only for the use of the designated recipients, which information may also be privileged.If the reader of this e-mail is not the intended recipient,the document has been received in error and any use,review,dissemination,distribution,disclosure or copying of this message is strictly prohibited If you have received this e-mail in error,please notify the sender via reply e-mail and immediately delete this e-mail from your system 2