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<br />DUFFY DEVELOPMENT COMPANY <br /> <br />10850 Co. Rd. 15 <br />Plymouth, Minnesota 55429 <br />Ph. (612) 544-6769 <br /> <br />Spencer Beach <br />Milford, Iowa 51531 <br />Ph. (712) 337-3582 <br /> <br />Sept. 16, 1991 <br /> <br />Mike Lever <br />Minn. Dept. of Trans. <br />Transporation Bldg. <br />3485 Hadley Ave. N. <br />Oakdale, Minn. 55128 <br /> <br />Re." Calibre 'Ridge <br />Roseville, MN <br /> <br />Dear Hr. Lever, <br /> <br />Confirming our meeting last month and our phone conversation <br />today, we are to design the storm sewer system on this site <br />to handle a 5.6"/hr rainfall intensity.. No ponding on the <br />site-is required. <br /> <br />Run-off from the stte is to be collected at the southwest <br />corner, and then flow to the state drainage ditch along Hwy <br />36. The run-off then flows under Hwy 36 to a state holding <br />pond. Cross sections should be drawn per Standard Plate <br />5000A, except riprap, per Standard Plate 3134B, may ~e used <br />to replace the surge basin. <br /> <br />PVC pipe may be used within the, site but probably not on <br />the section ending on state easements. You will need to <br />review final velocity calculatiQn to make final determinations. <br />Either the Rational Method or Time Lag Method are acceptable. <br /> <br />Yours truly, <br />DUFFY DEVELOPMENT COMPANY <br />N5i# <br />/i;~~y <br />