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REMEDIAL SOIL AND GROUNDWATER INVESTIGATION SAMPLING PLAN RMC PACIFIC MATERIALS KERLINGER AGGREGATE PLANT 30350 TRACY BOULEVARD TRACY, CALIFORNIA San Joaquin County Site: #1737 BACKGROUND RMC Pacific Materials (RMC)operates an aggregate mining and processing plant at 30350 South Tracy Boulevard in Tracy, California. In March 2002, at the direction of the San Joaquin County Environmental Health Department(EHD), RMC implemented an approved work plan to begin delineating the extent of hydrocarbon contamination discovered during the removal of three USTs at the site. RMC drilled five soil borings to determine if the contamination had reached down to the local water table (-120 below surface grade) (bsg). Soil and water samples were collected from each boring and submitted to a state certified laboratory (Severn Trent) for analysis. A full report of the findings was sent to EHD for review. EHD inspected the site as the drilling project progressed and, based on preliminary field and laboratory data, determined that only three of the borings needed to be converted into groundwater monitoring wells. The remaining two borings were backfilled and properly abandoned by the contractor according to EHD's standards. RMC reported the findings of that investigation to EHD in a report titled Preliminary Site Assessment Report, RMC Pacific Materials Kerlinger Aggregate Facility dated April 4, 2002. Since 2002 the wells have been developed and sampled. Supplemental development and sampling reports have been filed with EHD, and a quarterly sampling and reporting program has been put into effect. Based on the reported data, EHD has determined that additional delineation of soil contamination is required at the site. In a letter dated November 6, 2003 EHD requested RMC to prepare a work plan detailing a new proposal for gathering the additional information. INTENT OF PROPOSED PLAN RMC is submitting the following remedial soil and groundwater investigation/ work plan for its Kerlinger Aggregate Plant(Figure 1). This plan aims to augment the previous contamination investigation as reported in our April 2003 Preliminary Site Assessment report by further delineating the horizontal and vertical extents of petroleum contamination found during the removal of diesel USTs at the site.