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------------ .... fifes, �, SEC0R 76 Station 11195 September 13, 2004 Page 4 analyzed were non-detect for all hydrocarbon constituents, except for soil sample MW-16- S9.5, which contained MtBE at a concentration of 0.040 ppm. MtBE was detected in all groundwater samples collected from the newly installed monitoring wells at concentrations ranging from 28 to 3,900 ppb. All other hydrocarbon constituents and fuel oxygenates were non-detect. An ozone sparge unit was placed into operation on December 20, 2002 and injects ozone in to sparge wells SP-1 through SP-15. A sensitive receptor survey and a '/-mile radius water well survey were performed by Alisto in 1999. No basements or subways were found within a 300-foot radius of the subject site. An offsite subsurface utility survey revealed the presence of a sanitary sewer trench adjacent to the subject site that may influence the transport of petroleum hydrocarbons in groundwater. A search of California Department of Water Resources (DWR) and Banks Information Solutions files indicated that seven water wells had been installed within a '/-mile radius of the subject site, however, the wells could not be located based upon the information provided by DWR. A visual reconnaissance of the area did not identify the presence of any additional water wells (Alisto, 1999). PROPOSED SCOPE OF WORK The proposed scope of work will consist of the installation of three groundwater monitoring wells (MW-22, MW-23, and MW-24) to a depth of 22 feet below ground surface (bgs). • Health and Safety Plan (HASP). As required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120), and by the California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), SECOR will update the current site-specific HASP prior to the commencement of fieldwork. The HASP will be reviewed by the field staff and contractors before beginning field operations at the site. • Permitting. Permits for the installation of the groundwater monitoring wells will be obtained from the San Joaquin County Environmental Health Department prior to beginning work. Additionally, ConocoPhillips will obtain access agreements for entrance on to private property. • Groundwater Monitoring Wells. Three soil borings will be advanced at the locations shown on Figure 1 using 8-inch hollow stem auger drilling equipment. Soil borings will be advanced to a total depth of 22 feet bgs and a 2-inch well constructed of scheduled 40 PVC casing and 15 feet of CP 11195 Assessment WP 9-04.doc SECOR International Incorporated