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�� CESCNEFSClM61t7AYR 2.0 FIELD SAMPLING SUMMARY Groundwater samples were collected from monitor wells MW-2, MW-2A, and MW-9 (Figure 1-1) on 2 March 2000 Groundwater sampling data sheets are presented in Appendix B ' Water levels in all wells were measured on 2 March The standing water volumes within wells ' scheduled for sampling were calculated using water levels measured in each well at the time of sampling and total well depths A submersible pump was used to purge three well casing volumes from each of the monitor wells At the beginning and during the purge process, the temperature, pH, and specific conductance of the purge water were measured This information was recorded on a sampling data sheet Groundwater samples for benzene, toluene, ethylbenzene, and xylene (BTEX) and for total petroleum hydrocarbons as gasoline (TPH-G) analysis were collected from the wells with a disposable bailer and nylon string The groundwater samples were transferred into 40 ml glass sample containers Sample containers were checked for air bubbles The sample containers were sealed in a plastic bag, placed with ice in an insulated chest, and logged on a chain-of-custody form for delivery to the analytical laboratory The pump used to purge and sample the wells was thoroughly cleaned prior to each use by placing it into a container of tap water and washing the outside of the pump. The disposable hose was discarded after purging each well Purge water from monitor well MW-9 was stored o ed in a holding tank located at 222E Weber Avenue When full, the water in this tank will be sampled and, if acceptable, will be discharged to the sanitary sewer under a permit from the City of Stockton Department of Municipal Utilities Purge water from MW-2 and MW-2A was stored 1n 55-gallon drums in the garage located at 100 N Hunter Street Purge water from MW-2 and MW-2A will be disposed of at a licensed treatment facility The groundwater samples were analyzed by EPA Method 8020 for BTEX and by EPA Method I8015M for TPH-G Groundwater sample analyses were performed by Sequoia Analytical Laboratory in Walnut Creek, California I L.PROJECTM ANJOQwRWIQ9wrr wm 3