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Aquifer Testing Work Plan <br /> Fortner P=Gro <br /> Bra Facility <br /> ' <br /> Stockton, <br /> North Broadway Avenue - <br /> Stockton,California <br /> Sierra-Pacific Project No. 94-055.05 <br /> ' will be evaluated. A portable air stripper and carbon filtration system will be tested. The system will <br /> ' be tested at full flow, and samples of the tail water from the remediation system will be collected at <br /> intervals and analyzed for the compounds known to be present. Samples will be collected from between <br /> ' the air stripper and the carbon polish units for evaluation of air stripping only during the start-up testing. <br /> ' If the pilot-scale remediation system has been proven to provide for complete ground water cleanup and <br /> is selected for use by Unocal,the cleaned effluent water from the pumping tests can either be re-inj ected <br /> in a remote injection well, or can be released to the City of Stockton municipal sewer under a special <br /> waste discharge permit. Special permits are routinely issued by the City of Stockton Public Works <br /> ' Department,Environmental Control Section. A bioassay maybe required prior to issuance of the permit. <br /> ' A second disposal option is the wastewater system at the facility,which currently collected rinsates from <br /> the wash rack in an underground storage tank for analysis and disposal or re-cycling. <br /> 1 <br /> A third possible disposal option is based upon previous observed attenuation of contaminant <br /> ' concentrations in stored purge water at the site. Purge water left stored in portable tanks on-site will <br /> undergo attenuation by volatilization and oxidation in the tanks. The stored water from well <br /> development, equipment rinsing, and other on-site uses will be analyzed to determine if this process is <br /> taking place. Sewerage(as described above),re-injection or local spreading of the cleaned purge water <br /> ' can be considered in this instance. <br /> ' 4.8 Ground Water Sampling and Testing <br /> Each aquifer identified will be sampled and tested for agricultural chemicals to determine where <br /> contaminants are present in the subsurface. Samples will be tested for total dissolved solids (TDS), <br /> ' nitrates (NO3-N), ammonium (NH4 N), agricultural fumigants (EPA 504), volatile halogenated <br /> hydrocarbon compounds (EPA 601), carbamates and urea-based pesticides (EPA 632-M), and <br /> ' chlorinated herbicides (EPA 8150). <br /> ' SIERRA-PACIFIC GROUP 10 <br /> 1 <br />