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TABLE A-2 Field Groundwater Parameter Measurements End of Purge Values November 2, 1992 Well/Sample I D pH Temperature (°F)' Conductivity (umbos) MW-1 NSZ NS NS MW-2 NS NS NS MW-3 NS NS NS MW-4 791 72 1 230 ' I °F degrees fahrenheit 2 NS = Not sampled due to dry well ' To sample the well, a precleaned bailer was lowered into the well, filled, and brought to the surface The water in the bailer was carefully poured into laboratory prepared glass bottles which were then capped with teflon lined caps. Samples were labeled with stick-on labels filled out in indelible ink, with the following information Site name Date collected Time collected Sample ID Sampler's initials Analysis required Sample containers were individually sealed in resealable, ziplock plastic bags and placed with ice in an insulated chest Samples were hand-delivered with a chain-of-custody document on the day of collection to the WESTON Analytics' laboratory in Stockton, California This laboratory ' is certified by the State of California to perform the required analyses Samples were submitted for analysis of total petroleum hydrocarbons as gasoline (TPH-G) by EPA Method 8015 (modified), and benzene, toluene, ethylbenzene, and xylene (BTEX) by EPA Method 8020 The bailer used to sample the well was decontaminated prior to use by an initial wash in an alconox-water solution with a stiff bristle brush, followed with a potable water rinse and a final spray rinse with distilled water. The well sounding device was decontaminated in a similar manner prior to use at each well The thin nylon line used to lower the bailer into the well was disposed of after each use Purge water and decontamination ansate were transferred into a 55- gallon drum and stored onsite pending the analytical results IsIXMPrsNwCMA�WP A-3 , �