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Corrective Action Plan Page 37 <br /> Ethyl Benzene < 0 5 µg/Liter 5 µg/Literl <br /> Total Xylenes < 0 5 µg/Liter 5 µg/Literl <br /> Lead < 5 jig/Liter 50 µg/Liter <br /> Note <br /> 1 The sum of the concentrations of benzene ethyl benzene, toluene and xylenes in any single sample <br /> shall not exceed 5 gg/Liter <br /> The pH of the discharge is limited to not less than 6 5 nor greater than 8 5 and it shall not <br /> be acutely toxic as defined by less than 90% survival of standard test organisms 50% of <br /> the time, and less than 70% survival 10% of the time in 96-hour, static or continuous- <br /> flow, bioassay tests in undiluted samples of the effluent <br /> GROUNDWATER, TREATMENT-SYSTEM AND DISCHARGE MONITORING <br /> The groundwater-quality, treatment-system and discharge monitoring program described <br /> below will be established to check that concentrations of any contaminants in the water <br /> discharged from the treatment system are within permissible limits, provide a database to <br /> guide selection of optimal operating parameters for the groundwater treatment system and <br /> monitor the progress of groundwater remediation <br /> Groundwater-quality Monitoring <br /> Groundwater-quality will be monitored by analysts of samples recovered from the <br /> monitoring and recovery wells <br /> Base-Line Data <br /> To establish base-line data prior to commissioning the groundwater recovery and <br /> treatment system, depths to groundwater will be measured in, and samples will be <br /> recovered from, all of the monitoring and recovery wells installed for the 152 East 11 th <br /> Street site (i a Wells NAV 1 through NAV 8 and Wells RW 1 through RW 3) <br /> Monitaring to Check the Progress of Remediatton <br /> TheProgr ess of remediation will be morvtored by analysis of samples recovered from each <br /> of the wells located within the plume of contamination on the 152 East Street site These <br /> are monitoring wells NAV 1, NAV 3 and NAV 4 and recovery wells RW 1, RW 2 and <br /> RW 3 <br /> To characterize temporal fluctuation in contaminant concentrations, samples will be <br /> recovered from each of the wells listed above within seven days following the start of <br />