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6.C. - Page 55 of 71 <br />Manufactured Stormwater Treatment Measure Maintenance Plan for <br />851 Main Street <br />April 20, 2018 <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.flowstobay.org) for more information. <br />Project Address: 851 Main Street <br />Assessor's Parcel No.: 053-233-06, 053-233-11, 053-233-12 <br />Property Owner: Gary Johnson, 855 Main Street, RWC LLC Phone No.: 650-324-9439 <br />Designated Contact: <br />Phone No.: <br />Mailing Address: 125 Willow Road, Menlo Park, CA 94025 <br />The property contains 1, Contech media filter system - 4 cartridge linear precast stormfilter. <br />located as described below and as shown in the attached site plan'. <br />a The media filter is located at the southwest corner near the driveway in the lower basement. <br />L 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 />Table I <br />Routine Maintenance Activities for Manufactured Treatment Measures <br />No. <br />Maintenance Task <br />Frequency of Task <br />1 <br />Inspect for standing water, sediment, trash and debris. <br />Monthly during rainy season <br />2 <br />Remove sediment, trash and debris from sedimentation <br />As needed <br />basin, riser pipe and filter bed, using vactor truck method. <br />Dispose of sediment, trash, filters and debris properly. <br />3 <br />Ensure that manufactured treatment measure drains <br />After major storm events and as <br />completely within five days. <br />needed. <br />4 <br />Inspect outlets to ensure proper drainage. <br />Monthly during rainy season, or as <br />needed after storm events <br />5 <br />Follow manufacturer's guidelines for maintenance and <br />As per manufacturer's specifications. <br />cartridge replacement. <br />6 <br />Inspect manufactured treatment measure, using the <br />Monthly, or after large storm events, <br />attached inspection checklist. <br />and after removal of accumulated <br />debris or material <br />Attached site plan must match the site plan exhibit to Maintenance Agreement. <br />Page 1 Updated 711/16 <br />ATTY/AGR/2018.230/855 MAIN STREET RWC, LLC -STMMA 126 <br />REV: 10-11-18 PR Page 17 of 19 <br />