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_ ___..__.,_ <br /> MEMORANDUM <br /> T0: Kirk Brooks <br /> FROM: Jane Zimmerman <br /> DATE: December 31, 1991 <br /> SUBJECT: Boeing Plan Review, Japanese Gulch � <br /> Detention Pond <br /> The following are my review comments on the Japanese Gulch I� <br /> detention nond plans: <br /> General Comments <br /> Japanese Creek is shown to the west of the detention pond <br /> area. Due to the location of this environmentally sensitive <br /> area, the proposed location of the pond must be approved by <br /> the Planning Department. <br /> Per the Boeing EIS, any work within 50 feet of an <br /> environmentally sensitive area will require a construction <br /> management plan. <br /> Wetoond <br /> A planting schedule for the treatment cell of the wetpond <br /> must be submitted and approved by Public Works. The plan <br /> should cal� out the type of vegetation to be plr.nted, the <br /> density oi the plantings, and the total number of plants <br /> needed. Plants suited to the depth of water in the <br /> treatment cell should be used, such as hardstem bulrush <br /> and/or cattails. The density of the plantings should be one <br /> every 2 square feet (approximately) . <br /> The wetland treatment cell area should be over-excavated by <br /> one f�ot and back-filled with organic soil or topsoil to <br /> help ensure the viability of the wetland vegetation. A note <br /> should be added to sheet C517 directing the contractor to <br /> perform the above actions. <br />