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The pump used to purge and sample the wells was thoroughly cleaned prior to each use b lacm <br /> • Yp g it into a <br /> container oftap water and washing the outside of the pump The disposable hose was discarded after purging <br />' each well <br />' Water(about 300 gallons)m the holding tank was discharged to the sanitary sewer under permit granted by <br /> City of Stockton Department ofMunicipal Utilities Purge water from the monitor well MW-9 was stored in <br />' the holding tank In addition with existing 250 gallons oftank water The water currently to the project tank <br /> was sampled and meets the requirements for discharge to the project sanitary sewer Therefore, the tank <br /> water will be discharged to the sanitary sewer under a permit from the City of Stockton Department of <br />' Municipal Utilities prior the next quarterly sampling event Purge water from MW-2 and MW-2A was stored <br /> in 55-gallon drums in the garage located at 100 N Hunter Street and meets the requirements for transfer and <br />' disposal at a licensed treatment facility <br /> The groundwater samples were analyzed by EPA Method 8020 for BTEX and by EPA Method 8015M for <br /> TPH-G The holding tank was also analyzed for methyl-tert-butyl ether Groundwater sample analyses were <br /> performed by Sequoia Analytical Laboratory in Walnut Creek, California <br />' 3.0 MONITORING RESULTS SUMMARY <br />'. 31 GROUNDWATER PHYSICAL CHARACTERISTICS AND POTENTIOMETRIC <br /> SURFACE ELEVATIONS <br />' Table 3-1 presents a summary of groundwater parameters, depths and elevations Since groundwater <br /> elevations were last taken in June 2002, groundwater elevations have decreased by an average of 1 14 ft <br /> 1 <br /> LVR0W-L-rS\SANJ0Q\HSA%2Q03RPT WPD 3 <br />