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r 2.0 FIELD SAMPLING SUN MLA-RY Groundwater samples were collected from monitor wells MW-2A and MW- (Figure 1-1 p 9 CF g ) on ' 22 March 1999 Groundwater sampling data sheets are presented in Appendix B Prior to sampling water levels in all wells were measured on 22 March The standing water volumes within the wells scheduled for sampling were then calculated using the water level measurements and total well depths. A disposable bailer was used to purge three well casing ' volumes from the monitor wells to be sampled The temperature, pH, and specific conductance of the purge water were measured prior to purging. This information was recorded on a sampling data sheet (Appendix B) and summarized 1n Table 3-1. Groundwater samples were collected from the wells with a disposable bailer and nylon string ' and then transferred into 40 ml glass containers. Sample containers were checked for air bubbles then sealed in a plastic bag, placed with ice in an insulated chest, and logged on a cham- of-custody form for delivery to the analytical laboratory where they were analyzed for benzene, toluene, ethylbenzene, and xylene (BTEX) and total petroleum hydrocarbons as gasoline (TPH- G). The groundwater samples were analyzed by EPA Method 8020 for BTEX and by EPA Method 1 8015M for TPH-G Groundwater sample analyses were performed by Sequoia Analytical Laboratory in Walnut Creek, California. Certified analytical results and chain-of custody ' documentation are presented in Appendix C. The pump used to purge the wells was thoroughly cleaned prior to each use with a TSP solution ' followed by a potable water rinse and a distilled water nnse The disposable tubing was discarded after purging each well ' Pure water from MW-2A and MW-9 was stored in a 55-gallon drum located at 100 N Hun Purge g ter ' Street. Purge water stored in this drum will be disposed of at a licensed treatment facility 1 i I L SPROJEGTS\SANJOQU;A{H5A"APR 4 AVnJ 19W