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Jonas & Associates Inc to check for floating product Each well was purged with a centrifugal pump a minimum of three well volumes prior to obtaining a sample for analysis ' Conductivity, pH, temperature and turbidity were monitored during purging Purging was conducted until these parameters stabilized, to ensure that a representative sample was taken ' After purging, water samples were collected using a clean teflon bailer The samples were transferred from the bailer to appropriate sample bottles with as little ' turbulence as possible Sample containers for volatiles analysis were visually inspected following filling to ensure that there were no air bubbles in the container The sample containers were labeled, placed on ice, and transported to a laboratory ' for analysis A Chain-of-Custody form accompanied the water samples to serve as a record of ' sample possession from the time of collection to the time of arrival at the analytical laboratory The sample number, site identification, date sampled, analyses requested, and sample condition upon receipt at the laboratory were also recorded ' on the Chain-of-Custody form (PG&E, 1988) 2 3 3 Method Used to Measure Free Product Thickness During each groundwater sampling event, a clear acrylic bailer was used to collect a sample from the water surface in each well to visually inspect for floating product ' Observations were recorded and presented in the quarterly monitoring reports 2 3 4 Method Used to Measure Groundwater Elevations ' An electric sounder consisting of a contact electrode, suspended by an insulated electric cable from a reel that has a buzzer attached, was used to measure water ' levels to the nearest 0 01 foot The buzzer sounded when the electrode touched the water surface The electric sounders used in this project were calibrated by comparing each interval to a steel tape, and remarking them where necessary ' 2 4 Analytical Methods ' 2 4 1 Soil Samples Analytical Methods ' Selected soil samples collected during the subsurface investigations performed in 1986 and 1988, were analyzed for total petroleum hydrocarbons as gasoline (TPH- G) (EPA Method 5030/8015), benzene, toluene, ethylbenzene, and total xylene (BTEX) (EPA Method 8020), and total lead (EPA Method 7421) 6