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1 <br /> 1 <br /> • <br /> 1 Groundwater na 10 to 14, TreadweINWID <br /> feet bgs <br /> • TPH-gasoline was detected in all groundwater 1 samples, except B-2 and ranged from 450 P P g <br /> to 50,000 parts per billion(ppb), <br /> 1 • TPH-diesel was detected in all samples and ranged from 62 to 15,000 ppb, <br /> • TPH-motor oil was detected in all groundwater samples, except B-2, and ranged from <br /> ' 310 to 1,500 ppb, <br /> • Benzene was detected at 19 and 420 ppb in B-3 and B-4, respectively, <br /> • Toluene, ethylbenzene, and xylenes were detected in most borings except B-2, and <br /> 1 • No MTBE was found above the detection limit in groundwater samples <br /> ' Based on the government database search provided in Appendix C, the Site has been listed as a <br /> Regional Water Quality Control Board (RWQCB) Spills, Leaks, Investigation, and Cleanup <br /> lie (SLIC)Program site on 3 July 2002 <br /> 1 3.0 POTENTIAL OFFSITE SOURCE AREAS <br /> ' There are numerous documented leaking underground storage tanks (LUSTS) sites located <br /> upgradient and cross-gradient to the Site (Figure 2) The LUST sites have contaminated the soil <br /> and groundwater with gasoline, diesel, and/or motor oil and have or are currently undergoing <br /> remediation and monitoring These former LUST sites and other areas of concern include the <br /> 1 following <br /> I Chevron Service Station and Car Wash - 575 West Grant Line Road, <br /> 2 Self-Service Car Wash - 575 West Grant Line Road, <br /> ' 3 Chevron Fuel Pipeline— West Grant Line Road, <br /> 4 Tracy Express Wash &Lube--2480 Tracy Boulevard, <br /> 5 Mobil Service Station —2375 Tracy Boulevard, <br /> 6 Scotties Service Station— 574 West Grant Line Road, <br /> 7 Wheel Country & Service Station —474 West Grant Line Road, <br /> Site Assessment Report 7 21 May 2003 <br /> TREADWELL&ROLLO,INC. <br />