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FLUID LEVEL MONITORING Fluid levels are monitored in the wells using an electronic interface probe with conductance sensors. The presence of liquid-phase hydrocarbons is verified using a hydrocarbon-reactive paste. The depth to liquid-phase hydrocarbons and water is measured relative to the well box top or top of casing. Well box or casing elevations are surveyed to within 0.02 foot relative to a county or city bench mark. GROUNDWATER SAMPLING Once total depth is reached with the Geoproberm equipment, grab-type groundwater samples were collected by lowering a 10 foot section of 1/4 inch Teflon tubing with a stainless steel check ball attached at the bottom, below the static water level and filled by gently pushing the tubing up and down. The tubing is retrieved and the sample is properly decanted to 1-liter and 40-milliliter glass containers. The sample containers were filled to zero headspace and fitted with Teflon-sealed caps. Each sample is labeled with the project number, well number, sample date, and sampler's initials. After the samples have been labeled and documented in the chain of custody record, they were placed in a cooler with ice at approximately 4 degrees Celsius(°C)prior to and during transport to a state-certified laboratory for analysis. CHAIN OF CUSTODY PROTOCOL Chain of custody protocol is followed for all soil and groundwater samples selected for laboratory analysis. The chain of custody form(s) accompanies the samples from the sampling locality to the laboratory, providing a continuous record of possession prior to analysis. DECONTAMINATION Drilling/Geoprobe7m equipment is decontaminated by steam cleaning before being brought onsite. The rods were also steam cleaned before each new boring is commenced. Prior to use, the sampler and sampling tubes were brush-scrubbed in a Liqui-nox and potable water solution and rinsed twice in clean potable water. Water level meters and water sampling equipment were also decontaminated before each measurement or sample is collected to avoid cross-contamination between monitoring wells.