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6.1.B. - Page 26 Extended Detention Basin Maintenance Pian for Google Pacific Shores March 23, 2018 Project Address and Cross Streets: 1200-1900 Seaport Blvd. Redwood Citv, CA 94063 Assessor's Parcel No.: 054-330-110,210,220, 270 Property Owner: G000le, Inc. Phone No.: (708)-447-7052 Designated Contact: Caspar Waaner Extended detention ponds are basins whose outlets Phone No.: (708)-447-7052 have been designed to detain the stormwater runoff from a water quality design storm forsomeminimum Mailing Address: 1600 Amphitheatre ParkwaV time (e.g., 49 hours) to allow particles and Mountain View, CA 94043 associated pollutants to settle. The property contains 17 extended detention basins, which are shown in the attached storm water management plan. 1. Routine Maintenance Activities Primary maintenance activities include vegetation management and sediment removal, although mosquito abatement is a concern if the extended detention basin is designed to include permanent pools of standing water. Routine maintenance activities, and the frequency at which they will be conducted, are shown in Table 1, Page 1 Updated 711116 ATTYIAGR.2018.0921Google Inc. Table 1 Routine Maintenance Activities for Extended Detention Basins No. Maintenance Task Frequency of Task 1 Conduct annual vegetation management during the summer, Once a year removing weeds and harvesting vegetation. Remove all grass cuttings and other green waste. 2 Trim vegetation at beginning and end of wet season to prevent Twice a year (spring and fall) establishment of woody vegetation, and for aesthetics and mosquito control. 3 Evaluate health of vegetation and remove and replace any dead Twice a year or dying plants. Remove all green waste and dispose of properly. 4 If turf grass is included in basin design, conduct regular mowing and remove all grass cuttings. Avoid producing ruts when mowing. 5 Remove sediment from fore bay when the sediment level As needed reaches the level shown on the fixed vertical sediment marker and dispose of sediment properly. Page 1 Updated 711116 ATTYIAGR.2018.0921Google Inc.