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Extended Detention Basin Maintenance Plan for <br />Google Pacific Shores <br />March 23, 2018 <br />Project Address and Cross Streets: 1200-1900 <br />Seaport Blvd. Redwood Citv, CA 94063 <br />Assessor's Parcel No.: 054-330-110, 210.220. <br />270 <br />Property Owner: Google, Inc. <br />Phone No.: (708)-447-7052 <br />Designated Contact: Caspar Wacner <br />Extended detention ponds are basins whose outlets Phone No.: (708)-447-7052 <br />have been designed to detain the stormwater runoff <br />from a water quality design storm for some minimum Mailing Address: 1600 Amphitheatre Parkwav <br />time (e.g., 48 hours) to allow particles and Mountain View, CA 94043 <br />associated pollutants to settle. <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 />No. <br />Table 1 <br />Routine Maintenance Activities for Extended Detention Basins <br />Maintenance Task <br />1 Conduct annual vegetation management during the summer, <br />removing weeds and harvesting vegetation. Remove all grass <br />cuttings and other green waste. <br />2 Trim vegetation at beginning and end of wet season to prevent <br />establishment of woody vegetation, and for aesthetics and <br />mosquito control. <br />3 Evaluate health of vegetation and remove and replace any dead <br />or dying plants. Remove all green waste and dispose of <br />properly. <br />4 If turf grass is included in basin design, conduct regular mowing <br />and remove all grass cuttings. Avoid producing ruts when <br />mowing. <br />Frequency of Task <br />Once a year <br />Twice a year (spring and fall) <br />Twice a year <br />5 Remove sediment from fore bay when the sediment level As needed <br />reaches the level shown on the fixed vertical sediment marker <br />and dispose of sediment properly. <br />Page 1 <br />ATTY/AGR.2018.092/Google Inc. <br />Updated 7/1/16 <br />