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'r r3 <br /> e <br /> wruecas oesr�xsuxstitrens <br /> . 2.0 FIELD SAMPLING SUMMARY <br /> Groundwater samples were collected from monitor wells MW-2, MW-2A, MW-3A, MW-4,MW- <br /> 5, MW-6, MW-7, and MW-9 (Figure 1-1) on 15 and 16 November 1999. Groundwater sampling <br /> data sheets are presented in Appendix B <br /> Water levels in all wells were measured on 15 November The standing water volumes within <br /> wells scheduled for sampling were calculated using water levels measured in each well at the time <br /> of 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 of <br /> 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 /> seated in a plastic bag, placed with ice in an insulated chest, and logged on a chain-of-custody <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 by placing <br /> it into a container of tap water and washing the outside of the pump The disposable hose was <br /> Idiscarded 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. When full, the water in this tank will be <br /> sampled and, if acceptable, will be discharged to the sanitary sewer under a permit from the City <br /> of Stockton Department of Municipal Utilities Purge water from MW-2 and MW-2A was stored <br /> in 55-gallon drums in the garage located at 100 N. Hunter Street Purge water from MW-2 and <br /> MW-2A will be disposed of at a licensed treatment facility <br /> IThe 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, Califomia <br /> L\PkGjE T5S SANIOQllISA\4Q99RPP WPO 3 <br />