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<br /> <br />2660 Civic Center Drive <br /> <br />Memo <br />Roseville, Minnesota 55113 <br /> <br />(651)490-2200 <br /> <br />fax: (651)490-2275 <br /> <br />DATE: <br /> <br />June 1, 1999 <br /> <br />FROM: <br /> <br />Dennis Welsch <br /> <br />Debra Bloom, Assistant Public Works Director iJf^b <br /> <br />TO: <br /> <br />SUBJECT: <br /> <br />Centre Pointe EA W summary information <br /> <br />I have gone over the Centre Pointe (CP) fIle and the information provided in the EAW. I have found <br />reference to the storm water runoff and waste water demand. However, given the information provided <br />I am unable to confidently "fill in the blanks" on the summary table. The data inconsistencies indicate <br />that I am comparing apples to oranges. I have been unable to uncover anything in the engineering files <br />that will clear up the questions I have. <br /> <br />The data provided in the EA W is as follows: <br /> <br />Existin Storm Water Runoff (cfs) <br />Final Storm Water Runoff (cfs) <br />(2 ear, 24 hour eriod) <br />New Water Demand ( d) <br />Existin Waste Water (cfs) <br />Added Waste Water (cfs) <br />Total Waste Water (cfs) <br />Remaining Capacity (cfs) <br /> <br />77 <br />50 <br />(100 ear event) <br />71 ,400 <br />26.62 <br />50.83 <br />77.45 <br />? <br /> <br /> <br />m x 0.002228 cfs/ <br />m x 0.002228 cfs/ <br />m x 0.002228 cfs/ <br /> <br /> <br />m = 0.0593 cfs <br />m = 0.1132 cfs <br />m = 0.1725 cfs <br /> <br />The CP site is substantially smaller than the TL development, 281 vs. 56.4 acres respectively. As shown <br />in the above table, the CP EA W runoff is greater than that of the larger development. This is difficult to <br />credit because CP is made up of Residential property, usually these areas are 70% pervious. How could <br />the runoff be 3 times as great as the TL site which is 5 times Cp's size? <br /> <br />The data for New water demand appears to be more in line. I am skeptical though. <br /> <br />The Waste Water totals are substantially smaller, I cannot credit that they are even remotely accurate, <br />and I currently haven't been able to determine where the "remaining capacity" figure comes from. <br /> <br />I was unable to fmd the Twin Lakes EA W document The information you provided consisted of the <br />Council Action and comment letters from various private parties and government agencies. If you have <br />a copy of this document I may be able to determine how the TL numbers were generated. Let me know <br />if there is any more information available to get to the bottom of this. <br />