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uuuceas oeu�rurun5 <br />' At the beginning and dunng 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 laboratory. <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-5, MW-6, MW-7, and MW-9 was stored <br /> in a holding tank located at 222 E Weber Avenue The water in this tank was sampled on 2 <br />' November and then discharged to the sanitary sewer under a permit from the City of Stockton <br /> Department of Municipal Utilities. Purge water from MW-2 and MW-2A was stored in 55-gallon <br /> drums in the garage located at 100 N Hunter Street <br /> The groundwater samples were analyzed by EPA Method 8020 for BTEX and by EPA Method <br /> 8015M for TPH-G Groundwater sample analyses were performed by Sequoia Analytical <br /> Laboratory in Aspen, Colorado In the past, analyses have been done by Sequoia in Walnut <br /> Creek, California <br /> 3.0 MONITORING RESULTS SUMMARY <br /> 3.1 GROUNDWATER PHYSICAL CHARACTERISTICS AND POTENTIOMETRIC <br /> SURFACE ELEVATIONS <br />' Table 3-1 resents a summa of groundwater parameters, depths and elevations Since <br /> P summary g <br /> groundwater elevations were last taken on 10 August 2000, groundwater elevations have decreased <br /> by an average of 0 77 feet <br /> NCAShare&PROJ£CrS\SAN)DQIHSAWA0WRPT WPB 3 <br />