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�\ccording to thc information givcn for thc existino pond co,nbo, at an cle�'ation of 480 <br />icet,lhe discharge is 57 cfs and the storage is 2.5 acre-fec!. In orderto notincrease the <br />rate of discharge to thc do�vnstream system, the stago-storage-discharge relationship of <br />the developed pond must match, as closely as possiblc, the existing pond combination. <br />I lo�vever, at a storage volume of 2.5 acre-feet in the developed pund combo, tlte clevation <br />is morc than 482 fcct, widi a discharge rate of more than 195 cfs. ThereCore, :; grcater <br />rate oCstorniwater discharge �vill occur as a result of die modifications, ���hich is contrary <br />to lhc SI;PA conditions fbr this project. <br />Section X— maintenance must be in uccordance �vith ihc City of Gverett Storm�+ater <br />Management Manual. <br />PLANS: <br />Gcncr�l: <br />Trash racks are require�l on the ends of culverts that are 1 Z inches to _ 6 inches in <br />diameter and greater Uian GO fcet in Icngth. Trash racks arc requircd oii all opc�� ends of <br />pipes entering or Ieaving a closed piping system. <br />Givcn thc "cnclosing" of the upstrcam end of ihe 24-inch pipc oudet pipc (west pond), a <br />trasr.rack will bc required at dtc downstmam end. <br />Tiie access road to thc east pond is at the west end of the pond. I[owever, thc inlet is at <br />dic east end, and sediment will have a tendency to accumulate at the east end of the pond, <br />near the inlct. To aid in future sedimcnt removal, thc bottom of the pond should be <br />"hardened", from the access road to the inlet, to better accommodate maintenance <br />activitics. <br />'rUe civil plans must show a planting detail for the weQand treatment cell, Uclow the dead <br />storage elevation, which mcets Design Criteria # 10 of the wetpond standards fouud in <br />section 3-3.5.1 of dic Cit}'s Storrmvatcr Managenient Manual. <br />If there arc landscaping plans for the project, the wetpond planting plan and schedulc <br />must also bc shown on thc landscaping pians. <br />The ��eget�ted treatment ccll planting notcs shall include a calculation of tlu amount of <br />:�rca to be plantcd, and shall list a spccific �mntber of plants of cach sclected t}�pe. "I�hc <br />planting location within the vegetated treaUnent ccll shall also Uc specificd. <br />City s�nndards rcquire thc last catch basin upstrcam of a��etpond to Uc a 72-indi manholc <br />�� ith a minimum of 4 feet of catch. <br />tinecific comments on individual sheets: <br />"l�hc phasing on shcet C-l.l is very difficult to understand — thcrc are too many lines �� ith <br />thc samc weight. <br />l he curcent phasing plan shows thc existing 36" SD and its structums being abanduned in <br />phase 3�1. I lowcvcc construction of the new facilitics isn't called out until phase 4B. ]t <br />s.'��jzimmenn\�eurd�pr_everell m:ill � <br />�. <br />