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Atlantic Richfield Company • 4 ARCO Service Station#4932, t6 E Harding Blvd,Stockton,CA January 5,2001 groundwater samples will be collected and sent to a California Certified Laboratory (Sequoia Analytical or equivalent) The groundwater samples will be analyzed for TPHg using modified EPA Method 8015, BTEX using EPA Method 8020, and fuel oxygenates MtBE, DIPE, TAME,EtBE,TBA, 1,2 DCA, and EDB by EPA 8260 • Well Surveying. Upon completion of well construction, the wells will be surveyed by a licensed surveyor to a local benchmark relative to mean sea level Groundwater gradient will be interpreted utilizing wellhead elevations and depth-to-water measurements • Door-to-Door Sensitive Receptor Survey. A 500-foot radius door-to- door sensitive receptor survey will be performed to evaluate potential sensitive receptors in the area of the site, including undocumented domestic, irrigation, municipal, and industrial wells • Conduit Survey. An underground conduit survey will be performed to locate subsurface utilities, which may potentially influence groundwater flow and plume migration However, given the depth to groundwater at the site (approximately 27 feet bgs) it is unlikely that there are utilities in the area the may significantly influence groundwater flow • 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 C SCHEDULE SECOR is prepared to initiate field work within 4 weeks following approval of this work plan, the issuance of permits by the SJCEHD, the issuance of encroachment permit from the City of Stockton, and obtaining offsite access agreement A report documenting the findings of the soil borings and well installations is anticipated to be submitted approximately 6 to 9 weeks after the completion of the field work and upon receipt of all analytical data 077 43286 310/WPLAN3 dor