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2.0 FIELD SAMPLING SUMMARY Groundwater samples were collected from monitor wells MW-2, MW-2A, and MW-9(Figure 1-1) ' on 10 August 2000 Groundwater sampling data sheets are presented in Appendix B Water levels in all wells were measured on 10 August 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), for methyl tert- ' butyl ether (MTBE) 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 preserved with hydrochloric acid 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 in a holding tank located at 222 E 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 in 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, by EPA Method 8260 for MTBE and by EPA Method 8015M for TPH-G Groundwater sample analyses were performed by Sequoia Analytical Laboratory to Walnut Creek, California NCASharod\PROJECCSZAN1OQ1HSA\-Q PC WPD