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Foothill Landfill <br />Storm Water Pollution Prevention Plan <br /> <br /> <br /> <br />Page 73 <br />1. Be designed by a California licensed civil engineer with a 24-hour drawdown time or <br />with additional storage volume beyond the compliance storm standard to offset longer <br />drawdown time 14. <br />2. The facility is responsible for implementing measures to ensure the design standards <br />for the life of the BMP or BMPs are maintained, and as appropriate, include reliability <br />and safety factor calculations. <br />3. Should a facility install infiltration BMP or BMPs, the BMP or BMPs design needs to <br />include, if feasible, a shutoff mechanism (e.g., a valve that diverts discharge from entering <br />the BMP or BMPs). <br />4. Should a facility install infiltration BMP or BMPs, the BMP or BMPs shall address <br />possible groundwater contamination from the BMP or BMPs operation by using one or <br />more of the following methods: <br />A. The facility needs to ensure that all storm water and authorized non-storm water <br />(influent) entering the infiltration BMP or BMPs meets applicable Maximum <br />Contaminant Level (MCL) criteria for industrial pollutants at the facility, as <br />specified in General Permit Attachment I, Table A 1516. If the influent <br />concentrations do not meet applicable MCLs, the facility will have to have a <br />California licensed civil engineer: <br />a. Recommend and oversee the installation of the necessary pretreatment controls <br />during the design of the infiltration BMP or BMPs to ensure all the pollutants <br />associated with industrial activities in the influent of the infiltration BMP or <br />BMPs meet MCL criteria and include maintenance of all pretreatment controls <br />in the operation and maintenance plan required in General Permit Attachment I, <br />Section II.H.3.a.ii; or <br />b. Install monitoring devices (including, but not limited to, lysimeters) to collect <br />monthly samples of the infiltrated water below the infiltration BMP or BMPs to <br />demonstrate compliance with MCLs for pollutants associated with industrial <br />activities in the influent of the infiltration BMP or BMPs. The facility will need <br />to maintain proper calibration of the installed monitoring device or devices. The <br />monthly samples are only required when feasible sampling conditions exist <br />(including, but not limited to, enough moisture in the monitoring device to <br />collect a sample). When monthly samples are not collected, the facility must <br />document the above information in an attachment to the Annual Report and <br />update the SWPPP if necessary. <br />B. The facility shall implement 4.A.a or 4.A.b above for applicable Attachment I, <br />Table B constituents identified per the requirements in General Permit Attachment <br />I, Section IV. <br />C. A facility installing and operating storm water capture and infiltration dry wells 17 <br />will need to comply with the requirements in Section 4.A.a above and are not <br />eligible to install monitoring devices in place of the pretreatment requirements. <br /> <br />14 see Attachment I, Section II.E.3 Footnote#5 <br />15 see Attachment I, Section II.E.6 Table A <br />16 If the applicable RWQCB’s Basin Plan contains different water quality objectives for groundwater, the Basin Plan water quality <br />objectives will supersede as the pretreatment limit. see Attachment I, Section II.F.1 Footnote#11 <br />17 see Attachment I, Section II.E.6 Footnote #’s 8 & 9