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wu1. , PE—CU.xrls <br /> 2.0 FIELD SAMPLING SUND4ARY <br /> Groundwater samples were collected from monitor wells MW-2A and MW-9 (Figure 1-1) on <br /> 17 March 1998 Groundwater sampling data sheets are presented in Appendix B <br /> Prior to sampling water levels in all wells were measured on 17 March. The standing water <br /> P g <br /> volumes within wells scheduled for sampling were then calculated using the water level <br /> measurements and total well depths A submersible pump was used to purge three well casing <br /> volumes from monitor wells MW-2A and MW-9. <br /> At the beginning and during the purge process, the temperature, pH, and specific conductance <br /> of the purge water was measured This information was recorded on a sampling data sheet <br /> Groundwater samples for benzene, toluene, ethylbenzene, and xylene (BTEX) and purgeable <br /> I petroleum hydrocarbons as gasoline (T PH-G) analysis were collected from wells MW-2A and <br /> MW-9 with a disposable bailer and nylon string The groundwater samples were transferred into <br /> 40 ml glass sample containers Sample containers were checked for air bubbles. The sample <br /> containers were sealed in a plastic bag, placed with ice in an insulated chest, and logged on a <br /> chain-of-custody form for delivery to the analytical laboratory. <br /> lie <br /> The pump used to purge and sample the wells was thoroughly cleaned prior to each use by <br /> placing it into a container of tap water and washing the outside of the pump The disposable <br /> hose was discarded after purging each well <br /> Purge water from monitor well MW-9 was stored in a holding tank located at 222 E Weber <br /> Avenue The purge water stored in the holding tank will be sampled and discharged to the <br /> sanitary sewer prior to the next quarterly sampling event under a permit from the City of <br /> Stockton Department of Municipal Utilities Purge water from MW-2A was stored in a 55 <br /> gallon drum located at 100 N Hunter Street MW-2A purge water will be disposed of at a <br /> licensed treatment facility <br /> The groundwater samples collected from MW-2A and MW-9 were analyzed by EPA Method <br /> 8020 for BTEX and by EPA Method 8015M for TPH-G Groundwater sample analyses were <br /> performed by American Environmental Network in Pleasant Hill, California. <br /> L TROJECMSANJOQIHSA\HSA 99 APR 4 May 19% <br />