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During the August and September 1992 sampling events, Alton Geoscience measured pH <br /> and electrical conductivity on A-1 and E-1 Samples from A-1 and E-1 were collected in <br /> glass containers for delivery to a California-certified laboratory following proper <br /> preservation procedures and chain of custody documentation The following analyses were <br /> performed. <br /> 1 Total petroleum hydrocarbons as gasoline (TPH-G) using EPA Method 8015 <br /> (DHS modified) <br /> 2 Total petroleum hydrocarbons as diesel (TPH-D) using EPA Method 8015 <br /> (DHS modified) <br /> 3 Benzene, toluene, ethylbenzene, and total xylenes (BTEX) using EPA <br /> Method 8020 <br /> FINDINGS <br /> Analytical results and field parameter measurements completed by Alton Geoscience during <br /> the startup phase are summarized in Table 1. <br /> Laboratory reports and chain of custody records for August and September 1992 sampling <br /> events are included in Appendix A. Following is a summary of treatment system monitoring <br /> and sampling: <br /> • Approximately 4,750 gallons of ground water was treated and discharged <br /> from July 24 to September 24, 1992. The average discharge flow rate was <br /> approximately 77 gallons per day. <br /> • No free product was observed in extracted ground water. <br /> • Analysis of effluent water samples collected on August 24, 1992, from A-1, <br /> did not detect TPH-G, TPH-D, or BTEX at or above reported detection <br /> limits <br /> • Analysis of effluent water samples collected on September 24, 1992, from <br /> A-1, did not detect TPH-G, TPH-D, or BTEX at or above reported <br /> detection limits <br />