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rC f] <br />p� VJ H <br />h7 1-3 <br />HG <br />Gy] Y O <br />t"H <br />HH <br />gy <br />HrA <br />HOCA <br />'Ova o <br />FROM WS• OH-24 <br />a <br />-0 B. Wiitala <br />L. Ford <br />CC M. C. Pahmeier <br />L. Astemborski <br />D. Karanicolas <br />File <br />E. MacLeod <br />COORDINATION SHEET <br />N0. 1206BROI <br />JOBNo. BECE 89165 <br />DATE 12-06-90 <br />SUBJECT STORMWATER DETENTION SYSTEM FOR TWO NEW BALLFIELDS BY OHNO CONSTRUCTION <br />Sheet SC-22 of the HDA sheets indicate the east ballfield drainage system connecting <br />to the stormwater detention system below the parking lot. Changes required by the <br />City of Everett to maintain basin balance required that the east ballfields be <br />drained to the system below the tennis courts, as shown on the attached Site Plan. <br />The design for the relocation of the connection was not completed by HDA when the <br />ballfields were taken out of the contract. All of the SC drawings are otherwise <br />correct as they were issued for construction. <br />Volume calculations from HDA per the attached transmittal indicate that the detention <br />system for all four ballfields is to be located benieth the tennis courts and is <br />12,523 cubic feet in volume. This system, as sized for all four ballfields plus the <br />tennis courts plus some roadway surfaces is only one-fourth as large as the 49,613 <br />cubic feet system below the parking which is already in the GLY contract. <br />Also in contract at this time, the tennis court detention system has 92 lineal feet <br />of 8 foot dia. concrete pipe. The additional two ballfields per the present scope <br />requires an estimate 101 lineal feet of 8 foot pipe, or, an additional 9 lineal <br />feet of 8 foot pipe. This represents an estimate increase in the expense of $3,000, <br />with no increase required to the capital budget, per Jim Hughes. <br />At this time the City has been asked to re -run these new requirements through its <br />' computer model program, so the above is still subject to validation by the "black <br />NJ�„4 box". In any event, the increased expense promise to be small if not zero. <br />Brian Ritchhart <br />T-6141 <br />Attachments: Master Site Plan showing basin divisions <br />Transmittal from HDA dated 12-5-90 <br />00 WN 1090 REV. 2/79 <br />J55-0l1 <br />