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<br />_____.
<br />January lb, 2009
<br />Barr Engineering Company
<br />4700 West 77th Street Minneapolis, MN 55435-4803
<br />Phone: 952-832-2600 Fax: 952-832-2601 www.barr.com An EEO Employer
<br />Minneapolis, MN • Hibbing, MN • Duluth, MN • Ann Arbor, MI • Jefferson City, MO • Bismarck, ND
<br />Mr. Duane Schwartz
<br />Administrator
<br />Grass Lake Watershed Management Organization
<br />2660 Civic Center Drive
<br />Roseville, MN 55113-1899
<br />Re: Progress on Lake Owasso UAA 23/62-946
<br />Barr Invoice Period: November 29, 2008 through December 26, 2008
<br />Dear Mr. Schwark:
<br />The enclosed invoice is for professional services, which include the following:
<br />® Work on recalibration of P8 predicted runoff
<br />® Adjust "infiltration" losses in watershed ponds to match observed discharge data
<br />® Develop "baseflow" in P8 using an aquifer device to calibrate to flows at West Owasso Blvd.
<br />® Develop water balance for Bennett Lake and County Road C wetland to verity P8 runoff
<br />® Develop rating curves for Central Park wetlands (Dale Street & County Road C)
<br />® Review quality of 2007 flow data at West Owasso Blvd -check data against expected rating curve
<br />® Use WATBUD to estimate groundwater exchange & verify Lake Owasso water balance
<br />® Adjust removal efficiencies of all P8 treatment devices
<br />® Work on incorporating additional data information from 2008 into the draft Lake Owasso UAA report
<br />The table below provides a summary of the project budgets based on the major work tasks identified
<br />in the agreed upon scope of services.
<br />
<br />
<br />Task
<br />
<br />Task Descri tion Updated
<br />Contract
<br />Bud et
<br />Current
<br />Invoice Total Billed
<br />(including this
<br />invoice
<br />
<br />Balance
<br />001 Current & Historic WQ $2,020.00 $0.00 $2,544.00 -$524.00
<br />002 Set Beneficial Use Goals $1,150.00 $0.00 $562.50 $587.50
<br />003 Assess Goal Attainment $350.00 $365.50 $365.50 -$15.50
<br />004 Estimate Lake Water & TP $18,345.17 $0.00 $18,345.17 $0.00
<br /> Budgets
<br />005 In-Lake Modeling Ex LU $21,743.45 $0.00 $21,956.28 -$212.83
<br />006 In-Lake Modeling Future LU $3,050.00 $0.00 $93.50 $2,956.50
<br />007 BMP Assessment $5,040.00 $987.50 987.50 $4,052.50
<br />008 UAA Report $16,870.00 $1,028.50 $13,541.00 $3,329.00
<br />009 Project Management $8,545.00 $152.50 $9,854.62 -$1,309.62
<br />010 Lake Use Survey $13,001.38 $0.00 $13,001.38 $0.00
<br />011 2008 Monitoring (Barr Only) $2,000.00 $0.00 $2,833.38 -$833.38
<br />012 2008 Watershed Model Validation $7,265.00 $6,254.50 $9,726.00 -$2,461.00
<br />013 2008 In-Lake Model Validation $7,130.00 $1,911.00 $1,911.00 $5,219.00
<br /> TOTAL $106,510.00 $10,699.50 $95,721.83 $10,788.17
<br />
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