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Growidwater & Environmental Services, Inc. 1323 South Shamrock Avenue - Monrovia, CA 91016 • 866-507-1411 • Fax 626-599-7706 July 31,2008 GES Project 38-00058 Inspector Muniappa Naidu,REHS Senior Registered Environmental Health Specialist Environmental Health Department San Joaquin County 600 East Main Street Suite 1700,City Hall East Stockton,CA 95202-3029 D� RE: Dispenser/UDC Upgrade-Soil Sampling Report �l I r� i-) 7 Q Location:ARCO Facility No. 6020 alaH 1711 East Yosemite Avenue Manteca,CA Dear Inspector: On behalf of Atlantic Richfield Company(ARCO),Groundwater and EnvironmentalSe 'ces,Inc.(GES)submits this Dispenser/ UDC Upgrade— Soil Sampling Report regarding the fuel dispenser and s it sampling activities which occurred on July 17,2008 at the above ARCO site. Following SB989 testing,the UDC p rtion of the fuel system was required to be replaced. The following information is provided or attached: • Soil sampling was conducted under direct supervision San Joaquin County Environmental Health Specialist Muniappa Naidu,on July 17,2008. • ARCO General/excavation contractor—Paradiso Mechanical,Inc. The site is an active ARCO retail fuel service station located on the north side of East Yosemite Avenue (State Highway 120),just east of the intersection of Yosemite Avenue and Highway 99, in Manteca, California(Figure 1). The station has three underground fuel tanks(USTs) and eight fuel dispensers located on the southern portion of the site(Figure 2). A site-specific health and safety plan was prepared by GES prior to initiating field activities,and notifications regarding the field activities were made in advance to the appropriate agencies and stakeholders. One soil sample was collected from beneath each of the eight former fuel dispenser locations, at a depth of approximately 2 feet(DI-1 through DI-4) and 4 feet (DI-5 through DI-8) below grade surface (Figure 2). Soil samples identified as DI-I through DI4 were collected by GES personnel directly into the sample sleeves,and soil samples DI-5 through DI-8 were collected from a backhoe bucket due to the required sample collection depth. All soil samples were collected in new stainless steel sleeves and also Encore samplers using EPA Method 5035. All soil samples were kept in coolers on ice after collection until delivered to the analytical laboratory,under chain-of-custody. GES collected eight soil samples from beneath the fuel dispensers on July 17, 2008. The soil samples were submitted to Test America Laboratory in Irvine, California for analysis of total petroleum hydrocarbons in the gasoline range(TPH-g)using California LUFT GC/MS, and benzene,toluene, ethylbenzene, and total xylenes, and methyl tertiary butyl ether, di-isopropyl ether, ethyl tert-butyl ether, tert-amyl methyl ether, and tert-butanol, ethanol, 1,2 dibromoethane,and 1,2-dichloroethane by EPA Method 8260B. None of the above-mentioned analytes were detected above their respective laboratory reporting limits in the soil samples collected. The analytical data is tabulated on Table 1 and presented in Attachment A. Soil sample locations are displayed on Figure 2 in Attachment A. Based on the analytical laboratory results, there appears to be no evidence of a new release at this site. Thus,no further action is considered necessary at this time. Environmental Solutions and Liability Management