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f Tank Closure Report Quik Stop No. 121 Page 4 Chemical Analysis Results As previously mentioned, North State analyzed the samples for TPHG/BTEX and oxygenates using EPA Test Method 8260 . For the six soil samples collected from the bottom of the excavation (S-1 through S-6) , the laboratory reported all six samples to be free of detectable TPHG. Soil sample S-2 was reported to have 15 milligrams per kilogram (mg/kg) of benzene. Soil sample S-3 was reported to contain toluene at 11 mg/kg and ethylbenzene at 21 mg/kg. No other TPHG or BTEX compounds were reported in these six samples . The laboratory did report oxygenates in all six soil samples . Methyl- t-Butyl Ether (MTBE) was detected and ranged from 43 micrograms per kilogram (ug/kg) in S-1 to a high of 27, 000 ug/kg in S-5. No other petroleum compounds were reported in these samples . The two grab water samples (W-1 and W-2) were reported to contain detectable petroleum compounds, including 1, 500 micrograms per liter (ug/1) TPHG in both W-1 and W-2, 3 to 4 ug/l benzene, toluene ranging from 11 to 23 ug/l, ethylbenzene ranging from 14 to 19 ug/l and total xylenes ranging from 200 to 270 ug/l. In addition, MTBE was reported at 6, 800 ug/l in W-1 and 5, 900 ug/l in W-2 . These two water samples were also reported to contain 55 and 56 ug/l, respectively, of t-amyl methyl ether (t-AME) . The laboratory reported five of the seven stockpile soil (SP-1, SP-4, SP-5, SP-6 and SP-7) samples to be free of detectable petroleum contamination. Two of the seven samples (SP-2 and SP-3) were reported to contain MTBE at concentrations of 72 ug/kg and 11 ug/kg, respectively. No other petroleum compounds were reported in these samples . The laboratory results are summarized in Tables 1 and 2 and the laboratory reports are attached in Appendix C. Pump Island Soil Sampling CCI returned to the site on April 2, 1998 to collect soil samples beneath the fuel pump dispenser locations. Under the direction of the County, a hand auger was used to auger approximately two feet into native sand. Soil samples S-7 and S-8 (Figure 2) were collected using a slide hammer and 2 x 6 inch brass liners . The third fuel pump was located in the vicinity of the existing excavation, therefore, no sample was collected. These two soil samples were also submitted to North State for analysis. The laboratory reported soil sample S-7 to contain 10 mg/kg of TPHG, 0 . 02 mg/kg of ethylbenzene, 0 . 32 mg/kg of total xylenes and 14 ug/kg of MTBE. Soil sample S-8 was reported to contain 440 ug/kg of MTBE. No other petroleum compounds were reported in this