ARCHIVED REPORTS XR0009921 - Laserfiche WebLink

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Corrective Action Plan Page 42 All water samples will be analyzed by a laboratory certified by the California Environmental Protection Agency (Department of Health Services) to perform the cited analyses Coordination of Sampling ToP ermit the work to be performed cost-effectively, the groundwater, treatment-system, and discharge sampling designed to meet the several objectives discussed above will be coordinated so that monthly, quarterly and twice-yearly sampling rounds from the various wells and treatment-system sampling ports that fall on common periodic schedules can be performed on the same day Summary Before groundwater pumping is started, samples from all of the monitoring wells and recovery wells installed for the 152 East 11th Street property will be recovered and analyzed This will provide base-line groundwater-quality data During the three month period following startup of the remediation system, samples of water will be obtained from the recovery and monitoring wells in the interior of the plume of contamination, from the water discharged to the storm sewer and from the influents and effluents of the principal treatment-system process units according to the previously defined weekly and monthly schedules Analyses of these sample will permit the operating characteristics of the remediation system to be established Thereafter, to monitor the progress of remediation and check system performance, the regular water-quality sampling schedule will follow the scheme summarized below Sampling Point Sampling Frequency Analytes Treatment-S stem Discharge t Monthly 2 TPH(g) 3, BTEX 4, Y g Y pH, Specific Conductivity and Bioassay 5 Air Stripper Influents, Monthly TPH(g) and BTEX Air Stripper Effluent and Carbon Adsorption Mid-Point Monitoring Wells NAV 1, NAV 3 Quarterly 6 TPH(g) and BTEX and NAV 4 and Recovery Wells RW 1, RW 2 and RW 3 Monitoring Wells NAV 2, NAV 5 Twice Yearly TPH(g) and BTEX NAV 6, NAV 7 and NAV 8 (In wet and dry seasons)