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Flow -Through Planter Maintenance Plan for <br />200 Twin Dolphin <br />December 13th, 2022 <br />Flow-through planters are designed to treat and <br />temporarily detain runoff without allowing seepage <br />into the underlying soil. They typically receive runoff <br />via downspouts leading from the roofs of adjacent <br />buildings. <br />Project Address and Cross Streets <br />200 Twin Dolphin and Cormorant/Shoreline Drive <br />Assessor's Parcel No. 111-910-150 <br />Property Owner: 200-240 Twin Dolphin, LLC <br />Phone No.: Adam Voelker 610-334-0886 <br />Designated Contact: Meris Ota <br />Phone No.: 650-283-0547 <br />Mailing Address: _415 Mission Street, 45th Floor, San Francisco, <br />CA 94105_ <br />The property contains (1) flow-through planter(s), located as described below and as shown in the attached <br />site plan': <br />■ Flow -Through Planter TCM No. 4 is located at the east side of the parking garage, within the <br />surface parking lot area. <br />I. Routine Maintenance Activities <br />The principal maintenance objectives are to ensure that water flows unimpeded into the flow- <br />through planter and landscaping remains attractive in appearance. Table 1 shows the routine <br />maintenance activities, and the frequency at which they will be conducted. <br />Table 1 <br />Routine Maintenance Activities for Flow -Through Planters <br />No. <br />Maintenance Task <br />Frequency of Task <br />1 <br />Evaluate health of trees, shrubs and small plants. Remove and replace all dead <br />Twice a year <br />and diseased vegetation.' <br />2 <br />Maintain vegetation and the irrigation system. Prune and weed to keep flow- <br />As needed <br />through planter neat and orderly in appearance. <br />3 <br />Check that mulch is 3" deep and replenish as necessary. It is recommended that <br />Before wet season and as needed <br />composted arbor mulch be applied once per year to maintain the 3" depth in all <br />bare soil areas except within six inches of tree trunks.' <br />4 <br />Check that soil is at appropriate depth. Till or replace soil with the approved <br />Before wet season and as <br />biotreatment soil media as necessary to maintain a minimum of 6 inches between <br />necessary <br />the top of the biotreatment soil media and overflow outlet.' <br />' Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Z Plant lists, Specifications for Biotreatment Soil Media and Mulch and Supplier lists, can be found here: <br />www-fowstoba .or reventin •stormwater ollution with-new-recievely riient c -3 -ie ulated roects <br />Page 1 updated 1/1/22 <br />C-8 <br />ATTY/AGR.2023.051/Trammell Crow Company (200 Twin Dolphin - STMMA) (Page 23 of 25) <br />