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HomeMy WebLinkAbout20120147 Ver 1_PCN Additional Drawings Requested_20120214Strickland, Bev From: Steenhuis, Joanne Sent: Tuesday, February 14, 2012 9:30 AM To: Strickland, Bev Subject: FW: P1268B Camp Geiger Access Upgrades - PCN Package Additional Information DWQ # 120147 Attachments: P1 286B Camp Geiger Access Upgrades - PCN Additional Drawings Requested.pdf From: Denise Freund [mailto:dfreund()wkdickson.com] Sent: Tuesday, February 14, 2012 9:08 AM To: Shaver, Brad E SAW; Steenhuis, Joanne Cc: Jeff Becken; Korenek CIV Martin G Subject: P1268B Camp Geiger Access Upgrades - PCN Package Additional Information Brad and Joanne — Per our telephone conversations last week, attached please find PDF's of the following plan sheets to more fully describe the wetland impact adjacent to Campbell Street Extension. • Sheet CG -119 Campbell Street Extension Drainage and Erosion Control • Sheet CG -501 Miscellaneous Details — Includes the detail for the concrete trench with perforated pipe demonstrating that flow into the trench drain is only from surface water runoff. • Sheet CS -219 Campbell Street Extension Plan and Profile • Sheets CS -328 and CS -329 — Campbell Street Extension Roadway Cross Sections With respect to your questions regarding avoidance and minimization of impacts to the wetlands, we offer the following: • The width of the roadway was limited to only the number of lanes required to safely convey vehicular traffic through the intersection with Curtis Road and the connecting entrances to the commissary. • The roadway could not be shifted closer to the commissary building given the building setbacks required by Anti - Terrorism Force Protection (ATFP). • Medians have not been provided in the center of the roadway in order to minimize the roadway footprint and impacts to wetlands. • The profile of the roadway was established to minimize impacts to the wetland and still provide connectivity to the entrances to the commissary shopping center. With respect to your questions regarding the concrete trench drain system, we offer the following: • The wetland area currently drains by sheet flow into a roadside swale along the entrance road to the commissary parking lot. After entering the roadside swale, it is conveyed to the existing wet detention pond behind the commissary parking lot. The wet detention pond was not sized to accommodate the runoff from the wetland area and is inundated during rainfall events and not functioning as designed. • The design intent of the concrete trench drain system is to pick up runoff at the surface elevation of the wetlands and convey it through a pipe system into an outfall ditch in order to bypass the existing stormwater pond. The concrete trench drain system was designed in lieu of a graded swale along the toe of the fill slope from the Campbell Street Extension roadway as there are multiple low points along the toe of the fill and the swale would have gotten fairly deep in some locations in order to move the water along without the subgrade of the roadway being saturated with standing water. We were concerned that the depth of the graded swale would draw water from the wetland area in addition to capturing the surface water runoff. As you can see in the detail provided, there is no way for water to enter the concrete trench drain system other than at the surface elevation. Please let me know if you have any questions or need additional information in order to complete your review of the PCN package. Thank you. Denise Freund, PE Project Manager W.K. 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