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25 January 2001 <br /> AGE-NC Probed No 99-0559 <br /> Page 13 of 14 <br /> 6 6 3 Sample Withdrawal <br /> Water samples will be collected from the monitoring well screen using the same lift bailer used for <br /> purging These bailers consist of 3/a-inch tube and base check-valve and are disposed of after one use <br /> and require no decontaminating, thereby minimizing cross contamination due to sampling devices <br /> Care will be taken to ensure that visible air bubbles were not present in the vials after filling and <br /> capping <br /> 6 6 4 Sample Handling <br /> Ground water samples will be collected into laboratory-supplied containers Ground water samples <br /> for the EPA analyses described above will be collected into 40-m1 volatile organic analysis (VOA) <br /> vials containing 0 5 ml of hydrochloric acid as preservative Following collection the samples will <br /> be appropriately labeled, placed on ice and kept in a cooler until delivered to the laboratory for <br /> analysis Chain-of-custody protocols will be used to document sample custody transfer from the field <br /> to the analytical laboratory A chain-of-custody form will accompany the samples <br /> 67 Ground Water Extraction Monitoring Activities <br /> The pump and treat system will be monitored weekly to ensure optimal removal of dissolved <br /> petroleum hydrocarbons The ground water effluent flow readings will be recorded after GAC filter- <br /> media phase Grab treated water samples and treated exhaust vapor samples will be collected on a <br /> bi-weekly basis from the influent and effluent ends of the pump and treat system The samples will <br /> be collected and transported to a DHS-certified laboratory in a chilled container under ice (water <br /> samples) and under chain-of-custody procedure <br /> During the "start-up" period for the ground water extraction system, flow rate, pressure and <br /> temperature and ground water samples will be collected on a daily bads The anticipated start-up <br /> period will be approximately two weeks, but will be extended if necessary for system stabilization <br /> Three ground water level pressure transducers will be installed in the extraction well and into two <br /> additional shallow ground water monitoring wells Weekly data will be collected from the site <br /> transducers and after one month of operation data, will be collected monthly from the ground water <br /> level transducers <br /> Samples will be obtained and analyzed from the water treatment system effluent line to evaluate the <br /> effectiveness of the treatment system If the analysis of the treated water samples do not detect <br /> hydrocarbon compounds above the limits of the discharge permit, AGE will request the City of <br /> Stockton to allow continuous discharge of treated water directly from the treatment system into the <br /> sanitary sewer conveyance <br /> Advanced CtoEnN iron mental,Inc <br />