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6.A. - Page 64 of 69 <br />Extended Detention Basin Maintenance Plan for <br />Google Pacific Shores <br />February 12, 2019 <br />Project Address and Cross Streets: 515 <br />Cleveland St. — 433 Harrison Ave. <br />Redwood City, CA 94062 <br />Assessor's Parcel No.: 053-035-010, 020, 030, <br />040, 050, 060, 070_ --- <br />Property Owner: Harrison Avenue, LP. <br />Phone No.: (650)-213-1129 <br />Designated Contact: Forrest Mozart <br />Extended detention ponds are basins whose outlets phone No.: (650)-213-1129 <br />have been designed to detain the stormwater runoff <br />from a water quality design storm for some minimum Mailing Address: 1068 Meadow Drive <br />time (e. g., 48 hours) to allow particles and <br />associated pollutants to settle. Palo Alto, CA 94303 <br />The property contains 17 extended detention basins, which are shown in the attached storm <br />water management plan. <br />Routine Maintenance Activities <br />Primary maintenance activities include vegetation management and sediment removal, although <br />mosquito abatement is a concern if the extended detention basin is designed to include <br />permanent pools of standing water. Routine maintenance activities, and the frequency at which <br />they will be conducted, are shown in Table 1. <br />Table 1 <br />Routine Maintenance Activities for Extended retention Basins <br />No. <br />Maintenance Task <br />Frequency of Task <br />1 <br />Conduct annual vegetation management during the summer, <br />Once a year <br />removing weeds and harvesting vegetation. Remove all grass <br />cuttings and other green waste. <br />2 <br />Trim vegetation at beginning and end of wet season to prevent <br />Twice a year (spring and fall) <br />establishment of woody vegetation, and for aesthetics and <br />mosquito control. <br />3 <br />Evaluate health of vegetation and remove and replace any dead <br />Twice a year <br />or dying plants. Remove all green waste and dispose of <br />properly. <br />4 <br />If turf grass is included in basin design, conduct regular mowing <br />and remove all grass cuttings. Avoid producing ruts when <br />mowing. <br />5 <br />Remove sediment from fore bay when the sediment level <br />As needed <br />reaches the level shown on the fixed vertical sediment marker <br />and dispose of sediment properly. <br />Page S of 13 <br />ATTYlAGR/2019.2031515 CLEVELAND - STMMA EXHIBIT C <br />REV: 07-25-19 DZ <br />