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<br />Manufactured Stormwater Treatment Measure Maintenance Plan for <br />Costco Wholesale - Redwood City <br /> <br />April 4, 2008 <br /> <br />Manufactured Stormwater Treatment Measures are PROPRIETARY treatment devices that tend to <br />be installed below ground and operate using some type of proprietary filter media, hydrodynamic <br />separation, or sedimentation and screening. Common examples of manufactured treatment <br />measures include manufactured media filters, inlet filters or drain inserts, oil/water separators and <br />hydrodynamic separators. In August 2004, the Regional Water Board's Executive Office wrote a <br />letter stating that a project relying on inlet filters or oil/water separators as the sole treatment <br />measure would be unlikely to meet the maximum extent practicable standard of the National <br />Pollutant Discharge Elimination System Permit. See the Countywide C.3 Technical Guidance <br />(www.flowstobav.org) for more information. <br /> <br />Project Address: _2300 Middlefield Road, Redwood City, CA <br /> <br />Assessor's Parcel No.: <br /> <br />053-390-010 and -020 <br /> <br />Property Owner: <br />Designated Contact: <br />Mailing Address: <br /> <br />Costco Wholesale <br />Ed Navarro <br /> <br />Phone No.: <br />Phone No.: <br /> <br />(425) 313-8100 <br />(425) 313-8100 <br /> <br />999 Lake Drive. Issaquah. WA 98027 <br /> <br />The property contains 4 (3-Model 612 and 1-Model 676) Media Filtration Units by CDS <br />Technologies and one oil/water separator located as shown in the attached site plan 1. <br /> <br />I. Routine Maintenance Activities <br />The principal maintenance objective is to prevent sediment buildup and clogging, which <br />reduces pollutant removal efficiency and may lead to failure of the manufactured treatment <br />measure. Routine maintenance activities, and the frequency at which they will be <br />conducted, are shown in Table 1. <br /> <br /> Table 1 <br /> Routine Maintenance Activities for Manufactured Treatment Measures <br />No. Maintenance Task Frequency of Task <br />1 Inspect for standing water, sediment, trash and debris. Monthly during rainy season <br />2 Remove sediment, trash and debris from sedimentation As needed <br /> basin, riser pipe and filter bed, using vactor truck method. <br /> Dispose of sediment, trash, filters and debris properly. <br />3 Ensure that manufactured treatment measure drains After major storm events and as <br /> completely within five days. needed. <br />4 Inspect outlets to ensure proper drainage. Monthly during rainy season, or as <br /> needed after storm events <br />5 Follow manufacturer's guidelines for maintenance and As per manufacturer's specifications. <br /> cartridge replacement. <br />6 Inspect manufactured treatment measure, using the Monthly, or after large storm events, <br /> attached inspection checklist. and after removal of accumulated <br /> debris or material <br /> <br />1 Attached site plan must match the site plan exhibit to Maintenance Agreement. <br /> <br />Z:\2004\A04j97\SWQCP\O&M AGRF..E~IEl>.T,6\l.ManufacluRld_t=oImI_.y.I_lmlpI81e..FINAL .120307.d()l,: Page 1 <br /> <br />NDS Approved 12/5/07 <br />EXHIBIT B, SHEET 15 <br />