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t v ,%EP' Chevron Products Company 3 Fortner Chevron Service Station#9-6258,Stockton,CA October 28 1998 The specific scope of work is discussed below: • Soil Borings and Monitoring Well Installation. Three soil borings will be drilled at the locations shown on Figure 2. Soil borings will be drilled using 8-inch diameter hollow stem auger. Based on previous investigation at the site, groundwater is anticipated to be encountered at approximately 60 feet bgs. Upon completion of drilling, a 2-inch PVC groundwater monitoring well will be installed in each boring. • Permitting. Well permit applications have been submitted to the San Joaquin County Public Health Services, Environmental Health Division (SJCPHS). • Soil Selection and Analysis. Soil samples will be collected at 5-foot intervals and will be sent under chain-of-custody procedures to a California State-certified laboratory. Selected soil samples will be analyzed for total petroleum hydrocarbons calculated as gasoline (TPH-g) using modified EPA Method 8015, and benzene, toluene, ethylbenzene, and xylenes(BTEX), and methyl tertiary-butyl ether (MtBE) using EPA Method 8020. The highest reported detection (if any) of MtBE will be confirmed by EPA Method 8260. • Monitoring Well Development, Sampling, and Analysis. The wells will be developed by surging and pumping techniques. Groundwater samples will be collected from each of the monitoring wells upon completion of well development. The groundwater samples will be sent under chain-of-custody procedures to a California State-certified laboratory, and analyzed for TPH-g using modified EPA Method 8015, and BTEX and MtBE using EPA Method 8020. The highest reported detection (if any) of MtBE will be confirmed by EPA Method 8260. • Well Surveying. The elevations and northings and eastings of the groundwater monitoring wells will be surveyed by a licensed surveyor to a known benchmark relative to mean sea level. • Report. A report will be prepared after completion of necessary field work. The report will include soil boring logs, well construction details, soil and groundwater analytical results, chain-of-custody documentation, and conclusions. Field and laboratory procedures are presented as Attachment A. SCHEDULE SECOR is prepared to initiate field work immediately following approval of this work plan by the SJCEHD. A report documenting the findings of the assessment is anticipated to be submitted approximately 6 to 8 weeks after the completion of the field work and upon receipt of all laboratory data. 76007-0 t 8-01/wPLAN.DOC