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tBoy ett Petroleum October 31, 2000 <br /> 419 Main Street, Manteca, CA <br /> Groundwater Sampling Report- September, 2000 <br />' Summary of Analytical Findings <br /> This quarter, detectable contamination levels was identified in the monitoring wells listed <br /> below: <br /> Gasoline* ...: 22 'CS 13-24 fl <br /> Benzene <br /> Toluene .') <br /> Ethyl Benzene ....:: . ::. I 20 <br /> Total X lenes ....... $(14 <br /> ' MTBE ..... ;045.. . .. 24(x.... <br /> ND-"None detected"at or above Reporting Limit <br /> * Reported in mg/L. All other analytes reported in ug/L. <br /> ' MW-1 contained 11,000 ug/L of MTBE, an increase from last quarter in which MW-1 had <br /> a concentration of 770 ug/L. All other contaminates in MW-1 increased since last quarter <br /> ' . but they are all below the State Allowable Limits. Since the last quarter monitoring event <br /> in June, 2000, the concentration of MTBE has increased in MW-2 and MW-3 has <br /> decreased while the concentration of MTBE in MW-4 has increased. The highest <br /> concentration of MTBE is found in MW-1 this quarter as opposed to MW-3 last quarter. <br /> All contaminates except MTBE and Benzene are below the State of California maximum <br /> contaminate limits for groundwater. Past analytical data are listed in Table 2 for <br /> B <br /> comparison. Appendix A contains the laboratory analytical data and Chain of Custody <br /> report. <br /> The monitoring wells will be measured, purged and sampled again next quarter, and a <br /> new gradient calculated. <br /> 4 <br /> 2 <br /> 1 <br /> L. -. <br />