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page <br /> <br />Jim Sears <br />Department of Public WorKs <br />300 Senator 8uilding <br />220 High Street, SE <br />Salem, OR 97301 <br /> <br />Re: JaCK Isberg Fargo P~oad F'roperty <br /> Conditional Use/Variance 83-11/Isberg <br /> <br />5-4-83f <br /> <br />Oear Jim; <br /> Folowing up on our recent telepone conversations regarding <br />the above project~ Richard Webb, project architect wishes to drain <br />the storm water, from the property lying north of the east-west <br />mtorm drain line into the storm drain system to the south (see <br />attached drawing). <br /> The following square ¥ootages were taken from the <br />architect's, drawing, <br /> <br />Asphalt 9~500. <br />Sidewalk 1.600 <br />Roof 3~000 <br />Grass area 7~700 <br />Total <br /> <br />21,800 <br /> <br />0,5 acres <br /> <br /> Using your department's design standards, I have calculated <br />the composite coefficient of runoff (c) as follows: <br /> <br /> (14,100 X 0.90 + 7700 X 0.2) / 211800 = 0.65 <br /> <br /> I obtained a cop>' of your 5-20-82 calculations of the stor'm <br />drainage for Jack Isberg's de~¢elopmemt and have modified the <br />calculations as. follows (new area is noted as <br /> <br />Index No. AC C lDA Ak) C TOC TTOC <br /> <br /> C 1.35 0.80 1.35 0.80 10 10 2.40 2:80 <br /> <br />B+O 1.50 O.SZ 2,85 O.S1 1 1 2.25 5,20 <br /> <br />A' 0.50 0.65 S.35 0.79 1 2.25 ~5 6 0* <br /> <br />Overall <br />Remaining - 11 .~0 0.~5 - z..9 1 .40 10.~0 <br />Apeae. <br /> <br />Add in <br />Above areas- - 14.95 0.88 - 23.9 1,40 I4.20 14.2. <br /> <br />*see enclosed homograph <br /> <br /> <br />