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10062 Flanders Court N.E. Blaine, MN 55449 – Phone: (763) 780-0450 – Fax: (763) 780-0452 <br /> <br /> <br /> <br /> <br /> <br />December 7, 2015 <br /> <br />John Anderson P.E. <br />Interim Public Works Director <br />City of Arden Hills <br />1245 West Highway 96 <br />Arden Hills, MN 55112 <br /> <br />RE: Proposal for Services: Outfall Inspections and Pond Assessment <br /> <br />Dear Mr. Anderson: <br /> <br />It is our understanding that assistance is requested for two storm system related issues. <br />The first is the inspection of a portion of the outfalls within the City as required by the <br />Municipal Separate Storm Sewer System (MS4) permit. The permit requires inspections <br />of all outfalls within the City every five years. We assisted the City with the initial <br />inspection and documentation of the outfalls in 2011. As such we are familiar with the <br />process and the location of the outfalls within Arden Hills. <br /> <br />We propose to inspect 200 outfall structures (approximately 50% of the total number of <br />outfalls within the City). We will document the inspection utilizing the City’s mobile <br />application so that the data is readily transferable to the City. We will also provide a <br />summary of our inspections and any maintenance that is identified. <br /> <br />The second area that we will provide assistance is in regards to pond assessment. The <br />City has outlined a schedule and associated activities that are desired to be completed. <br />We will assist the City with the first two activities, which consist of determining the <br />subwatersheds that drain to each City owned pond and utilizing existing data to <br />determine a runoff curve number for each area. <br /> <br />It is estimated that there are thirty (30) City owned ponds that will need to be reviewed. <br />We will delineate the subwatersheds and provide a GIS map that provides the area that <br />drains to each pond. Then we will utilize existing maps to determine the percent of land <br />use cover and soils within each area to determine an associated runoff curve number. <br /> <br />We appreciate this opportunity to submit a schedule of rates and anticipated hours for <br />staff that are available to assist with the City with inspection of outfalls and development <br />of the first two activities of the pond assessment: <br /> <br /> # of Hours # of Hours <br /> Hourly Rate Outfall Inspection Pond Assessment <br />Project Manager $110.00 10 40 <br />Field Inspector $ 78.00 100 - <br />Engineering Technician $ 75.00 16 100 <br />