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3 0 RESUL'T'S OF 'THIRD QUARTER MONITORING ANIS SAMPLING <br /> 3 1 Groundwater Monitoring And Sampling <br /> Four groundwater monitor wells were sampled on October 4, 1995 These wells were installed as part <br /> of an environmental investigation conducted in December 1994 Prior to sampling, depth to water in <br /> each groundwater monitor well was taken and subjective analyses performed The subjective analyses <br /> consisted of checking for floating product or a hydrocarbon sheen by lowering a clean Teflon bailer <br /> down the well and collecting a sample at the groundwater-air interface Wells not containing floating <br /> product were purged of approximately 3 to 5 volumes of water or until groundwater parameters of pH, <br /> temperature, and conductivity stabilized as measured by portable meters calibrated to a standard buffer <br /> and conductivity standard (Appendix A) Groundwater samples were then collected by lowering a <br /> clean disposable bailer into the well and collecting a representative sample of the formation water The <br /> groundwater sample was slowly transferred to laboratory-cleaned sample containers, sealed with Teflon <br /> lined caps, and transferred to cooled storage The samples were then transported under suitable chain- <br /> of-custody to a State of California certified laboratory for the requested testing Each groundwater <br /> sample was analyzed for TPHg and benzene, toluene, ethylbenzene, and xylenes (BTEX), using <br /> modified EPA Method 8015, and EPA Method 602 respectively <br /> 3 2 Groundwater Elevation Data <br /> Groundwater at the Site was measured at depths between 73 91 to 85 88 feet below ground surface <br /> (bgs) A summary of data regarding groundwater levels through October 4, 1995 is presented in Table <br /> 1 Since the last sampling event, the groundwater potentiometnc surface elevation has decreased <br /> approximately 3 3 feet Generally consistent with the previous two quarters, the groundwater gradient <br /> is directed toward the southeast at a magnitude of approximately 0 15 ft /ft (Figure 2) <br /> 3 ' <br /> 419.7L.00ZwPL 7x79 19yd <br /> N000]-0a1.0i <br />