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<br />Barr's Relationship with Storm Water Permitting Staff-Minnesota <br />Pollution Control Agency (MPCA) <br />Barr has a contract with the MPCA to complete total maximum daily <br />load (TMDL) studies and Stormwater Program projects for the state. In <br />fact, Barr has already conducted several TMDL studies in addition to <br />completing a comprehensive phosphorus study for the MPCA. Through <br />this, our participation on the Stormwater Steering Committee (and <br />several subcommittees), and other ongoing work, we have a strong <br />working relationship with the MPCA and knowledge of watershed <br />management, stormwater modeling, best management practices <br />(BMPs), NPDES permit requirements, and total maximum daily load <br />(TMDL) regulations. This comprehensive technical knowledge will <br />benefit the City during preparation of the loading assess- <br />mentlnondegradation report, as well as any interactions with the MPCA, other selected MS4s, and the <br />public. Recently, we held a meeting with our clients and the MPCA stormwater permitting staff (see refer- <br />ences) to present our general approach and the assumptions that we have been using to complete the nondegra- <br />dation loading assessments. MPCA staff reviewed our written methodology, asked clarifying questions, and <br />provided suggestions for the completion of the Nondegradation Reports. After further internal review follow- <br />ing the meeting, MPCA staff called to indicate that they concurred with our approach and did not have any <br />comments or suggested changes to the loadings assessments. <br /> <br />Scott Fox <br />Minnesota Pollution Control <br />Agency <br />520 Lafayette Road <br />S1. Paul, MN 55155 <br />651-296-9433 <br /> <br />Lou Flynn <br />Permit Writer <br />Minnesota Pollution Control <br />Agency <br />520 Lafayette Road <br />St. Paul, MN 55155 <br />651-296-6575 <br /> <br />Floodplain Mapping; Development Plan Review-Sherburne County, Minnesota <br />Development Plan Review <br />Barr's relationship with Sherburne County dates back to 1997 when Barr began reviewing development <br />plans for the County. Barr's review involves examining peak discharge rates to determine if post devel- <br />opment conditions do not exceed pre-development; estimating low flow and entry elevations based on the <br />100- year high water levels of ponding areas and conveyence channels; estimating conformance with the <br />water quality requirements of an NPDES permit; and examining temporary and permanent erosion control <br />measures. <br /> <br />Floodplain Mapping <br /> <br />Since the early 1970s, flood insurance rate maps (FIR.TVIs) in Minnesota have been used by communities, <br />lenders, and insurance providers to gather basic information about flood-prone areas and floodplain <br />development. The Federal Emergency Management Agency's (FEMA) map-modernization project is <br />intended to update the FIRMs as well as to make the maps' infor- <br />mation available in an electronic format. <br />After Sherburne County became a cooperating technical partner <br />(CTP) with FEMA, the county hired Barr to modernize floodplain <br />maps, profiles, and insurance studies to incorporate recent <br />development and improve topographic information in the area. At <br />the time, the county's existing flood insurance studies were out- <br />dated, with some over 20 years old. Development was rapidly <br />spreading into areas that had previously been mapped as unnum- <br />bered A zones, or not mapped at all. In most instances the existing <br /> <br /> <br />Barr Engineering Company <br /> <br />Page 3 <br />