ARCHIVED REPORTS_XR0008605 CASE 1

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for delivery to a California-certified laboratory following proper preservation procedures and chain of custody documentation After sampling, the system was shut down to reduce the amount of storage necessary for the discharged effluent Influent and effluent samples were collected and analyzed for the following: 1 Total petroleum hydrocarbons as gasoline (TPH-G) using EPA Method 8015 (DHS modified) 2 Total petroleum hydrocarbons as diesel (TPH-D) using EPA Method 8015 (DHS modified) 3 Benzene, toluene, ethylbenzene, and total xylenes (BTEX) using EPA Method 8020 On May 18, 1992, after receiving analytical results indicating the effluent from E-1 was not in compliance with NPDES permit discharge limas, the effluent was resampled, discharged into 55-gallon drums, and stored onsite Parameters such as electrical conductivity, pH, and flow rate were measured by Alton Geoscience After sampling, the ARS was shut down Effluent samples were collected and reanalyzed On May 22, 1992, after receiving analytical results indicating the effluent from E-1 was in compliance with NPDES permit discharge limits, the ARS was turned on and effluent was discharged directly into the storm drain This included previous discharge stored onsite in . 55-gallon drums The fifth day's sampling was conducted on May 27, 1992 Samples were collected and analyzed for TPH-G, TPH-D, BTEX, and fish toxicity bioassay FINDINGS Analytical results and field parameter measurements completed by Alton Geoscience during the startup phase are summarized in Table 1 Laboratory reports and chain of custody records are included in Appendix A. Following is a summary of treatment system monitoring and sampling: • Approximately 3,470 gallons of ground water was treated and discharged during this sampling period. • No free product was observed in extracted ground water • Analysis of influent water samples collected from I-1 during the first day (May 13, 1992) detected 160 parts per billion (ppb) TPH-G, 150 ppb TPH-D, 11 ppb benzene, 0.60 ppb toluene, and 2.0 ppb total xylenes • Analysis of effluent water samples collected from E-1 during the first day (May 13, 1992) detected 53 ppb TPH-G.