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Barr Engineering Company 4700 West 77th Street ®Minneapolis, MN 55435-4803 Phone: 952-832-2600 ®Fax: 952-832-2601 ®www.barr.com An EEO Employer 1, ~~ ~ '~ Minneapolis, MN • Hibbing, MN ~ Duluth, MN • Ann Arbor, MI • Jefferson City, MO -_ _ - April 21, 2008 Board of Managers Grass Lake Watershed Management Organization c/o Mark J. Maloney, P.E. Public Works Directory/City Engineer City of Shoreview 4600 Victoria Street North Shoreview, MN 55126 Re: Runoff Water Quality Monitoring -Yard Waste Compost Site in Roseville Dear Managers: This letter sets forth the Agreement between the Grass Lake Water Management Organization (GLWMO) and Barr Engineering Company regarding the proposed scope for the runoff water quality monitoring services at the yard waste compost site in Roseville, MN. The additional scope of professional consulting services we will provide for your project includes completion of the tasks described below: nr ucin The Grass Lake Watershed Management Organization (GLWMO) has identified the yard waste composting area off of Dale Street in the City of Roseville as a potential source of excess nutrients in the Lake Owasso watershed in the Watershed Management Plan (September 2001), and the Board of Managers and local citizens have expressed continued concern about the potential impact of the compost area on Lake Owasso water quality. The City of Roseville is also interested in further investigating the runoff water quality from the compost site, as there is currently very little data available to estimate the runoff water quality from this site. Two compost site monitoring options are presented to help quantify the compost site as a potential pollutant source to Lake Owasso. Option 1 would involve the monitoring of three additional surface runoff monitoring sites within the yard waste compost site for the spring, summer, and early fall of 2008 to help estimate the contribution of the compost site to the total phosphorus budget of Lake Owasso. This would involve the collection of runoff from 10 storm events at each of these monitoring sites. Additionally, runoff flow and water quality will be monitored at Dale Street near the compost site during 2008. Assuming Option 1 is selected, completion of this study is expected to be during the first quarter of 2009. Option 2 would involve only monitoring the flow and water quality of runoff at Dale Street during 2008, as outlined in the Lake Owasso UAA Study scope expansion. If the estimated areal loading of phosphorus at this monitoring site is significantly greater than that estimated for the rest of the Lake Owasso watershed, then detailed monitoring of runoff at the three sites at yard waste compost site as P:AMpls\23 MN\62\2362946\WorkFiles\ProjectManagementAForGLWMO_04212008\Campost_Monitoring_Revised Letter Contract_Apri121.doc April 21, 2008 Version