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Tosco Marketing Company . 2 Circle K Store#5450,950 1 1'h Slrtet,Tracy,CA February 2, 1999 Our objectives in performing the scope of work are: 1. To upgrade the dispensers to meet the 1998 UST standards; and 2. Address areas of soil contaminated with hydrocarbons using limited over-excavation or other.appropriate methods based on the levels encountered. Site-Specific Health and Safety Plan As required by the Occupational Health and Safety Administration (OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120), and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5I92), a Site-Specific Health and Safety Plan has been prepared for the site. The Health and Safety Plan will be reviewed by the field staff and contractors prior to beginning field operations at the site and is included as Attachment A. Soil Sampling Activities During upcoming activities, SECOR will be onsite to observe the removal of the dispensers and other associated underground facilities, and to collect soil samples in accordance with SJCEHD requirements. The samples will be submitted under chain-of- custody documentation to a California State-certified analytical laboratory for analysis as described below. Laboratory Procedures Soil samples collected during dispenser upgrade activities will be submitted to the laboratory and analyzed for the presence of total petroleum hydrocarbons calculated as gasoline (TPH-g), TPH as diesel (TPH-d), benzene, toluene, ethylbenzene, xylenes (BTEX compounds), and methyl tertiary butyl ether (MtBE) by EPA Methods 80I5 and 8020. In addition, one selected soil sample collected from beneath the dispensers will be analyzed for fuel oxygenates DIPE, TAME, EtBE, MtBE, and TBA by EPA Method 8260. Management of Excavated Soil and Limited Over-Excavation If soils contaminated with hydrocarbons are encountered, limited over-excavation may be performed. Over-excavation, if performed, will be limited to approximately 50 to 200 cubic yards of soil. The area of possible over-excavation is shown as a dotted line on Figure 1. The vertical extent of the over-excavation will be based on the limits of the excavation equipment, which is approximately 10 to I2 feet. Upon excavation, the soil will be stockpiled in segregated piles and covered with plastic sheeting at the site for sampling and later disposal. Stockpiled soil will be temporarily stored on the northern portion of the site. All stockpiled soil will be sampled at one 7G888-027-01/WPLAN