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HomeMy WebLinkAboutWPO201400086 Correspondence 2015-01-29 COLLINS 200 GARRETT ST, SUITE K CHARLOTTESVILLE VA 22902 434.293.3719 PH 434.293.2813 FX www.collins-engineering.com January 29, 2015 Justin Deel Senior Planner County of Albemarle Depai talent of Community Development 401 McIntire Road Charlottesville,VA 22902 RE: SUB-2014-00166& WPO-2014-00086 Foothill Crossing—Phase IV& V Road Plans Dear Justin: Thank you for your comments dated November 7, 2014. Revised plans are hereby submitted incorporating the following changes in response to the items in your letter: Planning(SUB-2014-00166) 1. The connector road is not part of Phase 4 & 5. It will be included with the Foothills II rezoning application. 2. The woodland preservation calculations are listed on the cover sheet and the Landscaping Plan. The woodland preservation areas are now also shown on the Landscaping Plan. 3. Conservation plan&checklist added to the Landscaping Details sheet. Engineering Road Plan Review Comments (SUB-2014-00166) 1. The VSMP sheets have been removed to create the WPO set. 2. The roads have been labeled public on sheet 3 & sheet 7. 3. The drainage easement for pipe 31 has been provided. 4. Pipe 57 and the drainage easement have been revised. 5. All subgrade shall be compacted to a depth of 12 inches and to a density of not less than 95% of the maximum density as determined by ASTM D1557, or as required by the geotechnical engineer. All fill shall be tested by a geotechnical engineer to ensure compaction is reached and maintained. 6. Standard concrete aprons will be provided at each driveway. Overland relief between lots 53 and 54 has been provided. 7. The proposed features which are not included in Phases IV&V of this project have been removed from the plans. 8. The applicant acknowledges this comment. Virginia Department of Transportation(SUB-2014-00166) 1. The CG-12 detail has been updated. 2. The intersection angle at Leon Lane and Trinity Way has been labeled. It is 80°. 3. The future connection to Westlake Hills from Eastern Avenue is not part of this set and will be part of the"Foothills II Rezoning" currently being designed. The extension of Park Ridge Drive is not part of this set and will be part of the"Villas at Foothills Site Plan" currently being reviewed. 4. Driveway aprons have been shifted to be perpendicular to the curb and gutter. 5. The WP-2 detail has been provided on the plans. 6. There is a ** for this case in Pavement Design Guide Appendix III: BM-25.0 has a thickness equivalency value of 2.15 7. The design speed has been provided on the profiles. 8. Stop signs(R1-1)has been called out on the plans, in accordance with the MUTCD. 9. The no parking(R8-3) signs have been called out on the plans, in accordance with the MUTCD. 10. Line of sight profiles at Trinity Way/Leon Lane as well as Leon Lane/Park Ridge Drive are now provided on bottom of the Grading Sheet. 11. The profile run call out(STR 72-Out)has been revised. 12. Inverts have been provided at the outfalls. 13. The pipe lengths have been verified for STR 62A—STR 60A. 14. The inlet throat lengths are now consistent throughout the design. 15. The inlet computations for STR 74 have been revised. 16. The drainage design has been reviewed to target flow velocities between 3 and 10 fps, when achievable. In cases where the velocity is necessary to be over 10 fps due to design constraints, the velocity will still be below 15 fps. 17. The applicant prefers the T style turnaround at this time. Engineering VSMP Permit Plan Review Comments (WPO-2014-00086) A. Stormwater Pollution Prevention Plan(SWPPP) 1. The Foothill Crossing Phase IV &V SWPPP has been revised to use the county website template. 2. The WPO plan pages have been removed to create a standalone set. 3. The operator has been identified in the SWPPP documents. B. Pollution Prevention Plan(PPP) 1. The PPP has been provided with this revised submission. C. Stormwater Management Plan(SWMP) 1. The SWMP has been revised to utilize the new Virginia design requirements. D. Erosion and Sediment Control Plan(ESCP) 1. The purpose statement in the narrative has been revised to remove reference to previous and future phases. 2. Updated information and stockpile areas have been added to accurately reflect current site conditions. A portion of proposed storm sewer of phase 4& 5 outfalls into the existing Sediment Basin 2. It has yet to be converted into a SWM facility. 3. All prior plan information that shall not be approved with this plan has been removed from the set. The long diversion is no longer shown and the drainage areas have been adjusted to reflect this. 4. The longitudinal diversion dike has been revised to include an intermediate sediment trap (Sediment trap#1). 5. Sediment Basin 3 has been shifted to avoid disturbance within the WPO buffer. 6. The WPO 100' stream buffer has been labeled. 7. All existing easements are now shown and labeled. 8. The proposed sediment basins now include emergency spillways. 9. The plan now explicitly requires that diversion dikes outfall into stone at the basins. 10. The stone outfalls now extend to all the basin&trap floors. 11. Sediment basin 1 dimensions have been revised. 12. Baffles are only designed when necessary; however, they are necessary for these two proposed basins. It is the responsibility of the contractor to install all the ESC items as shown in the plan in accordance with the Virginia Erosion and Sediment Control Handbook. 13. Actual sections have been provided for the proposed sediment basin details. 14. Dewatering orifice elevations and diameters are now shown in the sediment basin details. 15. The title of Sediment basin 1 design table has been revised. 16. A paved construction entrance detail has been provided. 17. The north arrow has been shifted on Sheets 18 and 20. Please contact me if you have any questions or require any further information. Sincerely, Scott Collins, PE Justin Deel From: Kaitlyn Kostelec Walthall [kaitlyn @collins-engineering.com] Sent: Thursday, April 30, 2015 11:23 AM To: Justin Deel Cc: 'Scott Collins' Subject: RE: Foothill4/5-Wet Pond Level II-Water Balance Test Justin, Thank you for evaluating the water balance calculations previously submitted. I consulted with Scott and we intend to change the proposed level II wet pond to a strictly detention only dry pond for water quantity. This project is paying into the Lickinghole Creek Pro-rata Share,which will account for the TP load of 2.74 lb/yr released in excess of the minimum removal requirement. The revised submission will include this new detention pond and a note concerning the pro-rata share. Thank you, Kaitlyn Kaitlyn Kostelec Walthall,PE LEED AP BD+C Project Manager Collins Engineering,Inc. 1400 Key Boulevard Suite 100 Arlington,VA 22209 PH:434.327.6528 From: Justin Deel [mailto:jdeel @albemarle.org] Sent: Friday, April 24, 2015 2:36 PM To: Justin Deel; Kaitlyn Kostelec Walthall Subject: RE: Foothill4/5-Wet Pond Level II-Water Balance Test Kaitlyn, As I said on the phone, after looking at this again and discussing with the County Engineer, we can't justifiably assume a "RES"value of 24" while also assuming to having zero baseflow. Please provide an alternative solution, or if you'd like to discuss during a Thursday meeting let me know. Justin From: Justin Deel Sent: Thursday, April 23, 2015 4:13 PM To: 'Kaitlyn Kostelec Walthall' Subject: RE: Foothill4/5-Wet Pond Level II-Water Balance Test Kaitlyn, This is acceptable as long as your drainage area is clear.Just glancing at your previous plan, 5.13 acres seems a little high. Justin 1 From: Kaitlyn Kostelec Waithall [mailt`d'Ycaitlyn(acollins-engineering.com] Sent:Thursday, April 23, 2015 3:41 PM To: Justin Deel Subject: RE: Foothill4/5-Wet Pond Level II-Water Balance Test I've provided all the storms analyzed below: 1-Year 613.61 2-Year 613.72 10-Year 614.73 100-Year 616.82 Kaitlyn Kostelec Waithall,PE LEED AP BD+C Project Manager Collins Engineering,Inc. 1400 Key Boulevard Suite 100 Arlington,VA 22209 PH:434.327.6528 From: Justin Deel [mailto:jdeek albemarle.orq] Sent: Thursday, April 23, 2015 3:39 PM To: Kaitlyn Kostelec Walthall Subject: RE: Foothill4/5-Wet Pond Level II-Water Balance Test What is the elevation of the 2 year storm? From: Kaitlyn Kostelec Waithall [mailto:kaitlynacollins-engineering.com] Sent:Thursday, April 23, 2015 3:11 PM To: Justin Deel Subject: RE: Foothill4/5-Wet Pond Level II-Water Balance Test Justin, Thank you for reviewing my water balance calculations. In response your comments, I have hydraulically modeled the pond at 5.13 acres for the 1-year, 24 hour storm,which provides a water elevation of 613.61 (in excess of the 613.50 MWSE value used below). This again provides a minimum 24" reservoir in a 30 day summer drought per the water balance previously submitted. The Virginia Stormwater Management Handbook Volume I Appendix 5C describes a water balance analysis as the change in volume of the permanent pool, resulting from the potential total inflow less the potential total outflow. I believe by this definition,the permanent pool/minimum water surface elevation/normal pool elevation of 613.50 minus the floor of 608.00 is the correct value for the "average design depth DP", or 5.5'. Please let me know if these calculations are adequate to continue to use the wet pond design as discussed. Ideally,the pond will be integrated into the development to the west prior to being required to convert to a SWM facility so it can receive the 18 acres previously proposed. Thank you, Kaitlyn Kaitlyn Kostelec Waithall,PE 2 •LEED AP BD+C 4411111e° Project Manager Collins Engineering,Inc. 1400 Key Boulevard Suite 100 Arlington,VA 22209 PH:434.327.6528 From: Justin Deel [mailto:jdeek albemarle.orq] Sent: Thursday, April 23, 2015 10:13 AM To: Kaitlyn Kostelec Walthall Subject: RE: Foothill4/5-Wet Pond Level II-Water Balance Test Kaitlyn, To clarify what I said on the phone; I'm not able to justify using an average design depth (DP)of 5.5'that relies upon a 2- year storm to achieve.This may be easier to justify if the drainage area was closer to the minimum recommended 10 acres. I have no problem with your approach,in theory, but I'll need to see that the pond can reach and be maintained at a depth to satisfy the water balance test. I hope this helps. Justin From: Kaitlyn Kostelec Walthall [mailto:kaitlyn(&collins-engineering.com] Sent: Wednesday, April 22, 2015 12:14 PM To: Justin Deel Subject: Foothill4/5-Wet Pond Level II-Water Balance Test Justin, Thank you for your comments on Foothill 4/5. I'd like to discuss the Level II Wet Pond 'B' proposed on the property. Pond 'B' is designed to ultimately accept drainage from the project to the West (across the Connector Road). Your comment#4 stated the post-development DA cannot include future development,this drops the contributing DA from 18.19 ac to 5.13ac. The VADEQ No. 14 Wet Pond spec states that a wet pond can still function with a contributing DA less than 10 ac, provided it meets the Water Balance requirements. I ran the Water Balance test on the pond at 5.13 acres,to assure our wet pond still functions for this approval, while retaining the design needed for the future development. Please let me know if the following is adequate to retain the Level II Wet Pond at a 5.13 ac drainage area. This would be most expedient for our client and avoid a site plan amendment to redesign this pond when our future development to the West is submitted for approval. WATER BALANCE TEST DP> ET+ INF+ RES—MB DP=5.5' (Minimum Water Surface 613.5'—Bottom of Basin 608') ET=8" (Assumption Provided in VADEQ No. 14 Sec 6.2) INF=7.2" (Assumption Provided in VADEQ No.14 Sec 6.2) RES=24" (Assumption Provided in VADEQ No.14 Sec 6.2) MB=0" (Conservative Assumption of No Baseflow) 5.5' >8"+7.2" +24"-0 5.5'>39.2"or 3.27'CHECK 3 • 5.5'—3.27'=2.23' >2' CHECK,Yes a Ib,wrrimum 24" Reservoir is Maintained -woe Thank you for your time and consideration. I wanted to run this by you before committing to it in our resubmission of the project. Kaitlyn Kaitlyn Kostelec Walthall,PE LEED AP BD+C Project Manager Collins Engineering,Inc. 1400 Key Boulevard Suite 100 Arlington,VA 22209 PH:434.327.6528 4 COLLINS Now- Z00 GARRETT ST, SUITE K CHARLOTTESVILLE VA 22902 434.293.3719 PH 434.293.2813 FX www.collins-engineering.com May 28, 2015 Justin Deel Senior Planner County of Albemarle Department of Community Development 401 McIntire Road Charlottesville, VA 22902 RE: SUB-2014-00166& WPO-2014-00086 Foothill Crossing—Phase IV& V Road Plans Dear Justin: Thank you for your comments dated February 27, 2015. Revised plans are hereby submitted incorporating the following changes in response to the items in your letter: Engineering Road Plan Review Comments (SUB-2014-00166) 9. Temporary turnarounds have been provided at the Phase IV boundaries, see sheet 7. 10. The turnarounds are now bulb cul-de-sacs per the requirements of the Albemarle County Design Standards manual, see sheet 7. 11. The drainage area plan has been corrected per the VSMP review requirements. 12. The storm pipe slopes have been corrected to meet requirements. 13. The CG-12 detail has been enlarged, see sheet 7. Virginia Department of Transportation(SUB-2014-00166) 1. The WP-2 detail has been added to the details, sheet 7. 2. A CG-9B has been added to the end of Leon Lane, see sheet 3. 3. The bend in the water line on Leon Lane has been removed as requested, see sheet 4. 4. The note concerning the CBR report has been updated, see sheet 7. 5. The Park Ridge Drive pavement depth has been reduced with the revised calculations. 6. The roadway depths have been revised to provide adequate depths with the corrected factors, see sheet 7. 7. The asphalt top layer for Leon Lane has been reduced to 2". 8. The turnarounds are dimensioned on the details, see sheet 7. Fire & Rescue 1. The no parking zones on one side of the street have been labeled on the plans, see site plan sheet 3. Engineering VSMP Permit Plan Review Comments (WPO-2014-00086) A. Stormwater Pollution Prevention Plan(SWPPP) 1. N/A 2. N/A 3. The operator has been identified in the SWPPP documents. 4. The registration statement is provided for this project. B. Pollution Prevention Plan(PPP) 1. N/A C. Stormwater Management Plan(SWMP) 1. N/A 2. Only approved and or constructed features are now shown in the pre-development plan. 3. The pre-development has been modified to portray current existing site conditions. 4. The post-development drainage area boundaries now reflect only current conditions and conditions proposed with this plan. The pond will be utilized by the project to the west at a future time, so at this time a dry detention pond serving only for water quantity is proposed with excess capacity that also meets the requirements of the current design. This project will pay into the Lickinghole Creek pro-rata share, which provides in excess of the total phosphorous removal required at this phase (calculations on the pre-development sheet). In the future, the pond will be converted back to a Level II Wet Pond with an amendment to serve this development and the project to the West. 5. The grading has been adjusted to better reflect the home site grading and directs more runoff to DA#1 A. 6. The untreated area DA#1C has been reduced to reflect the limits of disturbance for this phase and woodland preservation area, 89% capture now achieved. 7. All future plan information is now removed from this plan. 8. The wooded areas for the CN calculations are now shown. 9. The WPO buffer is now shown. D. Erosion and Sediment Control Plan(ESCP) 1. N/A 2. Updated information and stockpile areas have been added to accurately reflect current site conditions. Sediment basin two has been constructed, and the contractor will survey the basin and restore it to original design volumes prior to constructing Foothill Crossing Phases IV/V to ensure proper functioning of the basin. See note page 9. 3. N/A 4. N/A 5. The new grading and limits of disturbance around Sediment Basin 3 do not extend into the WPO buffer(except for the outfall pipe as shown). For visual purposes, the tree protection line and the proposed treeline are shown on the outside of the LOD, however the tree protection line will be placed on the LOD. Also, the WPO buffer is now shown on the detail sheets. 6. N/A 7. N/A 8. The emergency spillways are now located in cut. 9. N/A 10. N/A 11. N/A 12. N/A 13. The basin profiles have been revised. 14. N/A 15. N/A 16. N/A 17. N/A 18. The WPO disturbance around SB2 has already been mitigated for with the Foothills Crossing Ph 2 & 3 Plan set (WPO2012-47), no new disturbance is proposed. 19. The stretch of diversion berm to the east of ST1 will only be removed when grading is completed over it during Phase 2. A note has been added to Phase 1 regarding this transition. At that point the silt fence will be adequate to protect this area because drainage north of it will be flowing towards Trinity Way. 20. Sediment Basin 3 calculations and details are now consistent. 21. The dam core note has been revised. 22. Stray labels have been removed. 23. Note has been updated to drain to ST1. ACSA Sheetl 1. The PE stamp with original signature on the first sheet will be provided prior to final approval. 2. The water and sewer data sheets are revised as requested. 3. The applicant acknowledges this comment. 4. The applicant acknowledges this comment. Sheet 4 1. The as-built sewer lateral lengths have been updated. 2. The valve configuration at Leon Lane and Trinity Way has been revised as requested. 3. The valve configuration at both fire hydrants along Trinity Way have been revised as requested. 4. A new sewer lateral for Lot 33 is provided. The sewer main crossing under Park Ridge Drive is necessary to serve the future phases, as a crossing under the Connector Road along the existing sewer alignment does not provide adequate cover in the future phase. Sheet 5 1. The ACSA access easement has been revised to adjacent to the storm drain outfall as requested. Sheet 8 2. The requested plan changes have been made on this sheet. *OW Note Please contact me if you have any questions or require any further information. Sincerely, Scott Collins, PE Justin Deel From: Kaitlyn Kostelec Walthall [kaitlyn @collins-engineering.com] Sent: Friday, July 10, 2015 12:17 PM To: Justin Deel Cc: 'Scott Collins' Subject: RE: Planning Application Review for WP0201400086 Foothill Crossing- Phase IV&V- Road Plans. Attachments: Limits of disturbance exhibit.pdf; WPO-11-ESC PLAN CALCULATIONS.pdf; WPO-6-SWM PLANS DETAILS.pdf Justin, Thank you for meeting me yesterday. I've attached the updated pond design (routings on this page). My responses to your final comments are provided below, please let me know if we've addressed your concerns. 4. The LOD/registration statement exhibit I showed you yesterday is attached to this email. 10. The pond footprint has been reduced to keep out of the adjacent lots. I've removed the access way from the adjacent properties and sloped grades at 3:1 above the pond for safety/maintenance. The new routing is provided on the SWM sheet(the elevations of the 2/10/100yr storms changed very slightly). 11. The spillway has been revised as I showed you yesterday in our meeting. 24. The ESC pond has been revised to fit the new footprint. Thank you, Kaitlyn Kaitlyn Kostelec Walthall,PE LEED AP BD+C,MPS/RE Project Manager Collins Engineering,Inc. 1400 Key Boulevard Suite 100 Arlington,VA 22209 PH:434.327.6528 From: Justin Deel [mailto:jdeek 1albemarle.orq] Sent:Thursday, July 02, 2015 10:02 AM To: 'Scott Collins'; Kaitlyn Kostelec Walthall Subject: Planning Application Review for WP0201400086 Foothill Crossing - Phase IV&V - Road Plans. The Review for the following application has been completed: Application Number= WP0201400086 Reviewer=Justin Deel Review Status = Requested Changes Completed Date=07/02/2015 1 ■ .`k. a E,.a N O 4. • t /V//j ,i, - .--:,..-;:--•''' . u r .—, , ::!, ..^. .'7,,,.:1. „ ,..4,:., ,„,i a,:,i `c, , - } .`--`(....' \ .. ggag: _, rr t ri• H' b, / 4,1 I s , ,..„ .11*1 29 , _. a r„ w,, y� c ' a J -'„ g 19 !N Z E Z ( W N \^* Z U au 9 J \ O �`./„,, , gig I swum-molt/3• .33 1N3A103S'8 NOIS083 SNVld OdM A VviapitiVHd ONISS00111H.LOOd -a,- -- !, 1..0/1/C0,113■CBSIA. . 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