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Mr. Donald A. Smith <br />August 15, 1983 - page 2 <br />AUG 17 1983 <br />CITY OF <br />LITTLE CANADA <br />3. Percent infiltration removal <br />The Little Canada and Golden Valley I/I Analyses assume 40% infiltration <br />removal in the areas studied. These reports also use higher unit reha- <br />bilitation costs. <br />The EPA report referenced in your letter was based on a study of 18 <br />communities. PSG has completed over 300 I /I's. <br />It will not be necessary to revise the cost - effective analysis even if <br />the 30% removal figure is used. The reduced cost savings will be <br />offset by reduced study and rehab costs. <br />4. Use of 3000 gpdim <br />Only one district with less than 3000 gpdim in all of these cities has <br />been determined to have excessive I/I under the grant- eligible approach. <br />This is District 2 in Little Canada. The cost comparison shows that it <br />is $48,045 cheaper to do follow -up study than to transport and treat <br />the flow. The $48,045 is a 20% difference in cost. This is a signifi- <br />cant amount. The cost comparison alone should qualify the district for <br />further study. We inspected four manholes in District 2 during the I /I. <br />Three of the four manholes showed leaks and mineral deposits. This <br />is further justification for the proposed follow -up work. <br />The cost comparison and physical data provide quantities and qualitative <br />evidence to justify the excessive determination. <br />Mr. Smith, I trust this will answer all of your questions about these projects. <br />We look forward to the prompt approval of the reports. <br />Sincerely, <br />PROFESSIONAL SERVICES GROUP, INC. <br />vec. <br />Robert C. Mayeron, P.E. <br />Vice President <br />pp <br />cc: Andy Martin, P.E., PSG <br />Kirby Van Note, P.E., PSG <br />John Harwood, OSM <br />Israelson 5 Associates <br />Milner Carley 8 Associates <br />Fred Stenborg, MWCC <br />Lennard Dittrich, Water 4 Sewer Superintendent, Golden Valley <br />Rey Eckstrom, P.E., Public Works Director, Robbinsdale <br />LaVanche Peterson, City Clerk, Lauderdale <br />Joseph Chlebeck, City Clerk, Little Canada <br />Neil Johnson, P.E. Director of Public Works, Brooklyn Parlc <br />Graydon R. Boeck <br />11 <br />