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<br />~EI <br />Green . <br />Environment me. <br /> <br />"'"""'8"'°'°"""°"""""0"' <br /> <br />"On Broadway" Parking Garage Dewatering Proposal <br /> <br />Page 3 <br /> <br />The laboratory will be directed to analyze the samples on an expedited 48-hour <br />turnaround time to provide feedback on system operation as soon as possible. If <br />the effluent chemical and physical constituent concentrations comply with the <br />permit requirements, the system will be authorized to begin operations. If the <br />effluent exceeds allowable contaminant concentrations, GEl will consult with the <br />City's contractor to determine the problem. Once system changes are made, <br />GEl will conduct start-up activities again. <br /> <br />Once the system is running for four to six days, two (2) effluent samples will be <br />collected and analyzed for VOCs. After the initial start-up period is over, GEl will <br />prepare a letter report for submission to the RWQCB, which details the start-up <br />activities, and any modifications to the treatment system. <br /> <br />Task 3: <br /> <br />Operations and Maintenance <br /> <br />GEl will provide periodic operation and maintenance (O&M) service (minimum of <br />once per month) to support the treatment system, in accordance with the NPDES <br />requirements. This task will include site investigations, system adjustments to <br />comply with the NPDES permit, recording groundwater flows, pressures, <br />treatment system readings and analytical sampling. GEl will also record alarm <br />shutdown events, replace bag filters and grease pumps as necessary. <br />In addition, GEl will make recommendations on the need for carbon change-outs, <br />and will coordinate the change-outs with the City's contractor. GEl will prepare a <br />monthly O&M Report for the City. <br /> <br />Task 4: <br /> <br />Monitoring and Reporting <br /> <br />In conjunction with Task 3, GEl will conduct monitoring of the treatment system <br />for one year. Specifically, GEl will on a once per month basis collect one (1) <br />influent, two (2) midstream and two (2) effluent groundwater samples for <br />subsequent laboratory analyses. The proposed sampling and analytical <br />schedule is provided in the table below. <br /> <br />Analyte Method Frequency # Samples <br /> Five (1 influent, 2 <br />VOCs EPA 82608 Monthly midstream, 2 <br /> effluent) <br /> Five (1 influent, 2 <br />TPH-g, TPH-d EPA 8015M Monthly midstream, 2 <br /> effluent) <br /> <br />Page 3 <br /> <br />r <br /> <br />r <br /> <br />.'["P' <br /> <br />.- T <br />