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At the beginning and during the purge process, the temperature, pH, and specific conductance of <br /> the purge water were measured This information was recorded on a sampling data sheet <br /> Groundwater samples for benzene, toluene, ethylbenzene, and xylene (BTEX) and for total <br /> petroleum hydrocarbons as gasoline (TPH-G) analysis were collected from the wells with a <br /> disposable bailer and nylon string The groundwater samples were transferred into 40 ml glass <br /> sample containers Sample containers were checked for air bubbles The sample containers were <br />' sealed in a plastic bag, placed with ice in an insulated chest, and logged on a chain-of-custody <br /> form for delivery to the analytical Iaboratory <br />' The pump used to purge and sample the wells was thoroughly cleaned prior to each use by placing <br /> it into a container of tap water and washing the outside of the pump The disposable hose was <br /> discarded after purging each well <br /> Purge water from monitor wells MW-3A, MW-4, MW-6, MW-7, and MW-9 was stored in a <br /> holding tank located at 222 E Weber Avenue The water in this tank was sampled on 10 May <br />' and then discharged to the sanitary sewer under a permit from the City of Stockton Department <br /> of Municipal Utilities Purge water from MW-2 and MW-2A was stored to 55-gallon drums in <br /> the garage located at 100 N Hunter Street Approximately 300 gallons of water from MW-2 and <br /> MW-2A purged during this sampling event and the three previous sampling events will be <br /> disposed of by Ramos Environmental at a licensed treatment facility located in West Sacramento, <br />' California <br />' The groundwater samples were analyzed by EPA Method 8020 for BTEX and by EPA Method <br /> 8015M for TPH-G In addition, samples from MW-2, MW-3A and MW-9 were analyzed for <br />' methyl tert-butyl ether (MTBE) by EPA Method 8260 Groundwater sample analyses were <br /> performed by Sequoia Analytical Laboratory in Walnut Creek, California <br /> 3.0 MONITORING RESULTS SUMMARY <br /> 3.1 GROUNDWATER PHYSICAL CHARACTERISTICS AND POTENTIOMETRIC <br />' SURFACE ELEVATIONS <br />' Table 3-1 presents a summary of groundwater parameters, depths and elevations Since <br /> . groundwater elevations were last taken on 2 March 2000, groundwater elevations have increased <br />' by an average of 0 83 feet <br /> NCAShlmd\PROJECTSLSANJOQ\HSA%2QOORPr WPD 3 <br />