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Home My WebLink AboutWPO201300050 Correspondence 2013-07-10 Michelle Roberge From: Frank Pohl Sent: Tuesday, January 07, 2014 10:16 AM To: Michelle Roberge Cc: Trevor Henry; David Anhold; Greg Harper; Joe Letteri Subject: RE: WAHS Biofilter Plans Thank you,great news! I've informed our contractor that he can now schedule his E&S pre-construction meeting. Thanks again, Frank Frank V. Pohl,PE, LEED AP BD+c Senior Project Manager Office of Facilities Development County of Albemarle 401 McIntire Road, Room 228 Charlottesville,Virginia 22902-4596 T (434)872-4501 ext.9-7914 F (434)972-4091 C (434)466-7458 From: Michelle Roberge Sent: Tuesday, January 07, 2014 10:11 AM To: Frank Pohl; David Anhold Subject: RE: WAHS Biofilter Plans Hi Frank, Glenn just passed them on to me. I approved all 4 plans. -Michelle From: Frank Pohl Sent: Tuesday, January 07, 2014 9:25 AM To: David Anhold; Michelle Roberge Subject: RE: WAHS Biofilter Plans Michelle, Good morning. Is there a chance these plans can be signed/approved today?Our contractor would like to schedule his E&S pre-construction meeting. Thanks, Frank Frank V. Pohl,PE, LEED AP BD+C Senior Project Manager Office of Facilities Development County of Albemarle 401 McIntire Road, Room 228 Charlottesville,Virginia 22902-4596 T (434)872-4501 ext.9-7914 F (434)972-4091 C (434)466-7458 From: David Anhold [mailto:danhold0hughes.net] Sent: Monday, January 06, 2014 2:13 PM To: Michelle Roberge Cc: Frank Pohl Subject: WAHS Biofilter Plans Michelle, Just a heads-up. At 12:30 I dropped off 4 sets of plans for your signature along with one signed and sealed copy of the Drainage Report. David ANHOLD ASSOCIATES Landscape Architecture Site Design Planning 8311 Rockfish Gap Trnpk. Greenwood,VA 22943 ANHOLDLA.COM 434-882-3420 2 ANHOLD ASSOCIATES Transmittal To: Ms. Michelle Roberge From: David T.Anhold,ASLA County of Albemarle Date: January 6, 2014 Dept. of Community Development Pages: 1 Re: Stormwater Management Project CC: Mr. Frank Pohl,Alb.County Western Albemarle High School Biofilter WPO-201300050 Signature Sets El Your Use ❑ For Review ❑ Please Comment ❑ Please Reply ❑ Please Recycle Michelle, Please find attached the following documents for your signature: • 4—Sets of Final Approved Plans. • 1 — Final Approved Watershed and Biofilter Hydrograph Summary Report. With kind regards, David Anhold, ASLA w/attachments Landscape Architecture+Planning 8311 Rockfish Gap Tpke. / V3 Greenwood,VA 22943 iA/ V/F:540.456.6422 YV 616L0/13 M:434.882.3420 danhold @hughes.net r j / l I SW/4 r � Michelle Roberge From: David Anhold [danhold @hughes.net] Sent: Thursday, January 02, 2014 10:02 AM To: Michelle Roberge Cc: Frank Pohl; Jimmy Taggart Subject: WAHS - Revised Plans Attachments: ANHOLD_WAHS_REVISED PLANS_12-18-13.pdf; TAGGART_WAHS_DRAINAGE RPT_ 12-17-13.pdf Michelle, Here is the previous email with revised plans and calcs. Let me know if you need hardcopies to review and I will be glad to drop them off. David Michelle, Attached are the revised Design Plans and Drainage Report for the project. Generally the changes include the following: • Drainage and Pipe Reports use the SCS 24-hr storm Methodology as requested by the County Engineer. Generally speaking this method produces a greater volume of water when compared with the Rational method. • The biofilter embankment was raised and the downslope grading was revised accordingly. • We eliminated one manhole and made some minor revisions to the stormwater pipe system. • The remaining manhole is 5'diameter and contains a 1'tall weir. • The underdrain system daylights at the endwall. • Both the 10-yr and 100-yr storms are accommodated by the biofilter and outfall pipe. The emergency spillway only becomes active above the 100-yr storm. • The plan revision are "clouded"to facilitate your review. Let me know if you have any additional questions or comments or would like a hardcopy of these documents. David ANHOLD ASSOCIATES Landscape Architecture Site Design Planning 8311 Rockfish Gap Trnpk. Greenwood,VA 22943 ANHOLDLA.COM 434-882-3420 1 NOW Nene Michelle Roberge From: Glenn Brooks Sent: Wednesday, December 11, 2013 7:53 AM To: Michelle Roberge Cc: Max Greene; Michael Koslow Subject: RE: WAHS Routing Confirmed. A 24hr storm distribution is required. The rational method does not provide this. No need for a meeting. From: Michelle Roberge Sent: Tuesday, December 10, 2013 5:31 PM To: Glenn Brooks Subject: FW: WAHS Routing fyi From: Frank Pohl Sent: Tuesday, December 10, 2013 4:38 PM To: Michelle Roberge; David Anhold Cc: Jimmy Taggart; Greg Harper Subject: RE: WAHS Routing Michelle, I think the purpose of the meeting is to simply confirm that the SCS Method of routing is required and that the Rational Method is not acceptable for a 1.80 acre watershed.Can you please confirm this with the County Engineer? If it is not, can you also confirm when the Rational Method can be used for routing? If this is something he can answer before the meeting, I don't think we will need to meet.And if it is required that the SCS method is used,considering we are still providing something that"isn't required",we will simply use the SCS method and revise the max stage elevations and discharge flowrates on the dwgs and that will be that. David/Michelle, if you still prefer to meet, I am all for it but think that we can save some time otherwise. Thanks Michelle, Frank Frank V. Pohl, PE, LEED AP eo+c Senior Project Manager Office of Facilities Development County of Albemarle 401 McIntire Road, Room 228 Charlottesville,Virginia 22902-4596 T (434)872-4501 ext.9-7914 F (434)972-4091 C (434)466-7458 1 From: Michelle Roberge Sent: Tuesday, December 10, 2013 4:09 PM To: David Anhold Cc: Frank Pohl; Jimmy Taggart; Greg Harper Subject: RE: WAHS Routing Please note that after talking to County Engineer,we will accept 0.5 in/hr for exfiltration. -Michelle From: David Anhold [mailto:danhold @hughes.net] Sent: Tuesday, December 10, 2013 12:06 PM To: Michelle Roberge Cc: Frank Pohl; Jimmy Taggart; Greg Harper Subject: FW: WAHS Routing Michelle, Here is the revised WAHS Biofilter routing for your review. It includes the revised manhole configuration and the 18" pipes. According to Jim's calculations, both the 10-yr and 100-yr events remain within the pond. See explanation below. I'll call later this afternoon to see if you have any questions/comments, and to find out how you would like to proceed for final approval. David ANHOLD ASSOCIATES Landscape Architecture Site Design Planning 8311 Rockfish Gap Trnpk. Greenwood,VA 22943 ANHOLDLA.COM 434-882-3420 From: Jim Taggart [mailto:jtagg2 @aol.com] Sent: Tuesday, December 10, 2013 11:15 AM To: danhold @hughes.net Subject: WAHS Routing David, I adjusted the model IAW the final plans as we discussed. I also did some research on the exfiltration rate of the Biomix. From Luck Stone product data, they classify their biomix as a Loamy Sand. The State of Md lists a minimum infiltrtation rate of 2.41 in/hr for a loamy sand. (Sources: http://www.mde.state.md.us/programs/Water/StormwaterManagementProgram/MarylandStormwaterDesignManual/Docu ments/www.mde.state.md.us/assets/document/sedimentstormwater/Appnd D13.pdf) http://www.luckstone.com/sites/default/files/BIOFILTER.pdf I chose to use a lower rate of 2.0 in/hr due to the nature of these calculations. With the reconfiguration of the system (omitting the weir and decreasing the pipe size)the 10 year event remains contained within the pond. Please recall that I have omitted the available storage volume of the 18" pipe(s)due to software limitations. Nonetheless, the outfall shows zero during the event as the brief period and depth (<1/2")of storage elevation above the outfall pipe invert is too short to be recognized by the outfall model. Therefore it is a calculation anomalie, typical when modeling a small, "flashy"watershed.. 2 NNW NINO' Similarly, the 100 year event shows no outfall for the pipe even though the pond elevation is 3"above the"weir"elevation. The timeline of that flooding is too short to effectively calculate a flow leaving the system. Thank you, Jim Taggart, P.E. for TCS Engineering Co., LLC 741 Duncan Hollow Loop Faber, VA 22938 Ph. 434.361.1215 3 Michelle Roberge From: David Anhold [danhold @hughes.net] Sent: Monday, November 25, 2013 10:57 AM To: Michelle Roberge Cc: Frank Pohl Subject: RE: E2_esc_Western Albemarle High School Attachments: ANHOLD_WAHS BIOFILTER_Bid Document Plans 10-3-13.pdf Follow Up Flag: Follow up Flag Status: Flagged Michelle, Sorry for not getting back to you much earlier on this. But,as I mentioned on the phone,we ended up redesigning the inlet in question. Instead of a single inlet with an interior weir,we went with a two manhole system (with an overflow pipe in place of the weir)that is more conventional and will be easier to access and maintain when necessary. Also,the Low Bid we received will allow for construction of channel improvements for both the upper area and the pipe outfall area. Attached is a pdf copy of the final plans for your review. Let me know if you have any other questions or concerns. David From: Frank Pohl [mailto:fpohlOalbemarle.org] Sent: Wednesday, August 28, 2013 8:28 AM To: David Anhold Subject: FW: E2_esc_Western Albemarle High School FYI. Frank V. Pohl, PE, LEED AP BD+C Senior Project Manager Office of Facilities Development County of Albemarle 401 McIntire Road, Room 228 Charlottesville, Virginia 22902-4596 T (434) 872-4501 ext. 9-7914 1 F (434) 972-4091 C (434) 466-7458 From: Michelle Roberge Sent: Tuesday, August 27, 2013 5:30 PM To: Frank Pohl Subject: E2_esc_Western Albemarle High School Hi Frank, Here is my comment. The only comment I have is regarding the water that will be stored in the MH. See attached. «E2_esc Western Albemarle High School.pdf» -Michelle Michelle Roberge Department of Community Development County of Albemarle,Virginia 401 McIntire Road Charlottesville,VA 22902 434.296.5832 ext.3458 2 Michelle Roberge From: Frank Pohl Sent: Wednesday, December 04, 2013 2:22 PM To: Michelle Roberge Cc: Greg Harper; David Anhold; Trevor Henry Subject: FW: E2_esc_Western Albemarle High School Michelle, I am not sure I follow your comment re only 33%of the 10-yr storm event being captured in the biofilter. From what I can tell it appears all of the flow goes into the biofilter. 10-yr stage=653.82-ft and Invert Out=654.00-ft. Please confirm. Thanks, Frank Frank V. Pohl, PE, LEED AP sD+c Senior Project Manager Office of Facilities Development County of Albemarle 401 McIntire Road, Room 228 Charlottesville,Virginia 22902-4596 T (434)872-4501 ext.9-7914 F (434)972-4091 C (434)466-7458 From: Michelle Roberge Sent: Monday, December 02, 2013 10:43 AM To: David Anhold Cc: Frank Pohl Subject: RE: E2_esc_Western Albemarle High School Hi David, I looked over the pipes to the biofilter. I also looked at pipes for overflow. It appears that you will be capturing about 33%of 10 year storm event into biofilter and the rest will be handled by overflow pipe. Since we do not have a reference point of pre-existing conditions,this will be considered an improvement to the site and will be approvable.Go ahead and submit plans. -Michelle From: David Anhold [mailto:danholdhughes.net] Sent: Monday, November 25, 2013 10:57 AM To: Michelle Roberge Cc: Frank Pohl Subject: RE: E2_esc_Western Albemarle High School Michelle, 1 Sorry for not getting back to you much earlier on this. But, as I mentioned on the phone,we ended up redesigning the inlet in question. Instead of a single inlet with an interior weir,we went with a two manhole system (with an overflow pipe in place of the weir)that is more conventional and will be easier to access and maintain when necessary. Also,the Low Bid we received will allow for construction of channel improvements for both the upper area and the pipe outfall area. Attached is a pdf copy of the final plans for your review. Let me know if you have any other questions or concerns. David From: Frank Pohl [mailto:fpohl @albemarle.org] Sent: Wednesday, August 28, 2013 8:28 AM To: David Anhold Subject: FW: E2_esc_Western Albemarle High School FYI. Frank V. Pohl, PE, LEED AP BD+C Senior Project Manager Office of Facilities Development County of Albemarle 401 McIntire Road, Room 228 Charlottesville, Virginia 22902-4596 T (434) 872-4501 ext. 9-7914 F (434) 972-4091 C (434) 466-7458 From: Michelle Roberge Sent: Tuesday,August 27, 2013 5:30 PM To: Frank Pohl Subject: E2_esc_Western Albemarle High School Hi Frank, 2 Here is my comment. The only comment I have is regarding the water that will be stored in the MH. See attached. «E2_esc_Western Albemarle High School.pdf>> -Michelle Michelle Roberge Department of Community Development County of Albemarle,Virginia 401 McIntire Road Charlottesville,VA 22902 434.296.5832 ext.3458 3 ANHOLD ASSOCIATES Transmittal To: Ms. Michelle Roberge From: David T.Anhold,ASLA County of Albemarle Date: August 12, 2013 Dept. of Community Development Pages: 1 Re: Stormwater Management Project CC: Mr. Frank Pohl,Alb. County Western Albemarle High School WPO-201300050 Resubmission El Your Use El For Review ❑ Please Comment ❑ Please Reply ❑ Please Recycle Michelle, Please find attached the following documents for your final review and comment: • 1 —Revised Application Form • 2-Revised Plans with showing the SWM and E&S design. • 1 —Watershed and Biofilter Hydrograph Summary Report • 1 —Stormwater Conveyance Channel(SCC)Summary and Design Report. • 1 —Biofilter Sizing Summary • 1 —Revised E&S Narrative. I believe that we have addressed all of your written and"red line"comments including the following: 1. Cover sheet has been revised.A Project Location Plan is shown 2. A Demolition Plan is included that shows the larger project area, all elements to be removed or altered, and a benchmark to the north next to the school. 3. Complete SWM Plans and Details are shown. 4. The WPO buffer is shown on the plans based on County GIS information. This project does not include any disturbance within the buffer. 5. The maintenance trail is shown as before but at 10'width. Landscape Architecture+Planning 8311 Rockfish Gap Tpke. /I Greenwood,VA 22943 V i Girpr Oc' V/F:540.456.6422 M:434.882.3420 /� danhold@hughes.net 1310.PIN/ lS I ! CC } 1/0 JO Yr Silt(In tl A , 1 >v2 picitac tr s'hctic charle Uenlih 6. Dimensions and layout information for the Biofilter is included on Sheet S-2. 7. A separate Utility Plan is shown on Sheet S-2. 8. The CE moved to the west and is shown on the existing asphalt parking area as directed. The Albemarle County CE Detail is included on the plans. 9. Most current VDOT EC-1 detail is shown on the plans. 10. The Landscape Plan is not complete at this time and is not shown with this submission. The final Landscape Plan will meet all required SWM design requirements. Please let me know if you have any further questions or concerns. With kind regards, David Anhold,ASLA w/attachments