Laserfiche WebLink
PROFESSIONAL SERVICES GROUP, INC. <br />UTILITIES MANAGEMENT DIVISION <br />835 North County Road 18 • Minneapolis, MN 55441 -6496 • (612) 546 -1300 <br />August 15, 1983 <br />Mr. Donald A. Smith, P•E. <br />Technical Review Section <br />Division of Water Quality <br />Minnesota Pollution Control Agency <br />1935 West County Road R -2 <br />Roseville, MN 55113 <br />Dear Mr. Smith: <br />RE: Infiltration /Inflow Analyses <br />pg2nirg. <br />AUG 17 1983 <br />CITY OF <br />LITTLE CANADA <br />We offer the following information in response to the questions outlined in your <br />letter of August 8, 1983. <br />1. Televising and cleaning costs <br />Attached are bids for three recent projects. They range from $0.183 to <br />$1.10 per foot for cleaning and from $0.365 to $0. 70 per foot for televi- <br />sion inspection. The combined cost range is from $0.548 to $1.80 per <br />foot. The costs we used in the I /I's are within this range and are very <br />reasonable estimates. There is no need to revise either the study costs <br />or the cost - effective analysis. <br />2. Unit costs for rehabilitation of infiltration defects <br />Each I/I Analysis is community- specific. The unit rehab cost is based <br />on anticipated repairs in each city. This estimate is based on the lcey <br />manhole inspections that were conducted. A typical unit cost calculation <br />is presented below: <br />% of Weighted <br />Source Contribution Rehab Costs Cost /gpm Rehab Cost <br />Manhole 2 gpm $ 900 $450 33 $150 <br />Service 2 gpm 1000 500 40 200 <br />Joint 2 gpm 400 200 20 40 <br />Crack 2 gpm 500 250 7 17 <br />$407 <br />We rounded this off to $400. The unit costs are dependent on costs, <br />contribution and percent of total rehab. These judgments were made <br />for each community based on our field investigation. Therefore, it is <br />not proper to use one generalized cost for every study. We will not <br />revise the cost - effective analysis. <br />11 <br />Water and Wastewater Flow Reduction • tit • Water Loss Studies • Operation and Management of Treatment Planta • O8M Manuals <br />ALBANY, NY • ATLANTA • DETROIT • HELLERTOW N, PA • MANCHE$TER, NH • MEMPHIS • MINNEAPOLIS • OCEAN CITY, NJ • PHILADELPHIA • SAN DIEGO • SAN FRANCISCO <br />A Spidpecry of Compa,n a i5 nerul• do Fau• <br />