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p <br /> 1 2.0 FIELD SAMPLING SUMMARY <br /> Groundwater samples were collected from monitor wells MW-2, MW-2A, and MW-9(Figure 1-1) <br /> r on 27 February 2001 Groundwater sampling data sheets are presented in Appendix B. <br /> Water levels in all wells were measured on 27 February. 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 volumes <br /> from each of the monitor wells. <br /> At the beginning and during the purge process, the temperature, pH, and specific conductance of <br /> k ;r 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 aplastic ba laced with ice in an insulated chest and logged on a chain-of-custody <br /> P g, P � gg Y <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 bYplacing <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 well MW-9 was stored in a holding tank located at 222 E. Weber <br /> Avenue. When full, the water in this tank will be sampled and, if acceptable, will be discharged <br /> to the sanitary sewer under a permit from the City of Stockton Department of Municipal Utilities. <br /> Purge water from MW-2 and MW-2A was stored in 55-gallon drums.in the garage located at 100 <br /> N. Hunter Street. Purge water from MW-2 and MW-2A will be disposed of at a licensed <br /> treatment facility. <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 Walnut Creek, California. <br /> k <br /> Y 1 <br /> LTROJECCSLSANJOQ WSA\1 W RPT.WPD 3 <br /> G e <br />