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Corrective Action Plan <br /> Page 30 <br /> i <br /> Benzene 1 EPA Method 602 <br /> �} Toluene 1 EPA Method 602 <br /> Ethyl Benzene 1 EPA Method 602 <br /> 1 <br /> Total Xylenes EPA Method 602 <br /> Bioassay 2 % Survival of Pimephales promelas <br /> Notes <br /> 1 If any of these constituents are detected in a weekly sampling of the discharge, the effluent will be re- <br /> sampled immediately and sampling and analysis will continued on a daily basis until the concentration(s) <br /> are below detectable levels <br /> 2 After an initial test immediately following the start of groundwater pumping, the maximum frequency <br /> of bioassay testing will be once per month <br /> To monitor and record the performance of the groundwater treatment system, a log of <br /> equipment operating parameters, flow-rates and pressure gauge readings will be <br /> maintained and water samples will be periodically recovered from the following points (in <br /> addition to the system discharge to the storm-water sewer) the water influent line to the <br /> sparge tanks, the water effluent line from the sparge tanks (i a the influent line to the <br /> carbon treatment units) and the nud-point between the pair of carbon treatment units (see <br /> Figure 10 for sampling-port locations) The water-quality samples will be recovered <br /> during treatment of the first charge of water pumped from the remedial excavation into the <br /> treatment system and once per week thereafter while the treatment system is in operation <br /> These water samples will be recovered in the same manner as described above for the <br /> effluent samples They will be analyzed for the following suite of analytes <br /> Analyte Method of Analysis <br /> Total Petroleum Hydrocarbons EPA Method 5030/8015M <br /> (as Gasoline) <br /> Benzene EPA Method 602 <br /> Toluene EPA Method 602 <br /> Ethyl Benzene EPA Method 602 <br /> Total Xylenes EPA Method 602 <br />