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lie <br /> 2.0 FIELD SAMPLING SUMMARY <br /> Groundwater samples were collected from monitor wells MW-2A, MW-3A, MW-4, MW-5, <br />' MW-6, MW-7, and MW-9 (Figure 1-1) on 17 through 19 May 1999 Groundwater sampling <br /> data sheets are presented in Appendix B <br />' Water levels in all wells were measured on 19 May. The standing water volumes within wells <br /> scheduled for sampling were calculated using water levels measured in each well at the time of <br />' sampling and total well depths A submersible pump was used to purge three well casing <br /> volumes from each of the monitor wells. <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 /> 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 <br /> . 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 /> 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 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 purge water stored in the holding tank <br /> was sampled and discharged to the sanitary sewer under a permit from the City of Stockton <br /> Department of Municipal Utilities Purge water from MW-2A was stored in a 55 gallon drum <br /> located at 100 N Hunter Street MW-2A purge water will be disposed of at a licensed treatment <br /> facility <br /> The groundwater samples were analyzed by EPA Method 8020 for BTEX and by EPA Method <br /> E8015M for TPH-G Groundwater sample analyses were performed by Sequoia Analytical <br /> Laboratory in Walnut Creek, California. <br /> L ft()jECTSLSANfOQ1HSAIHSA 99.1 UN 4 J�1999 <br />