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E Work Plan: Subsurface Investigation and Page 3 Remedial Excavation of Hydrocarbon-affected Soil Proposed Cintra Park Phase II Development, Tract 2705, Tracy, California June 17, 1997 CTE Job No. 10-2276 Soil samples will be collected from the excavation equipment bucket at locations selected by the environmental consultant. Samples will be collected either by driving 6-inch long by 2-inch diameter precleaned brass sampling sleeves or by scooping soil into a new, laboratory supplied, wide-mouth, 8 ounces, glass jar into the relatively undisturbed soil extracted by the backhoe. The exposed ends of the sleeve will be covered with teflon sheeting or aluminum foil, capped with plastic end caps, and sealed with a non-VOC tape. If glass jars are used, they will be sealed with teflon-coated lids. All soil samples will be labeled as to sample collection location and depth and placed into sealable, plastic bags. Selected soil samples will be submitted to a State of C lifornia-certified laboratory for analytical testing within 24 hours of collection. Based on San Joaquin County Environmental Health Division requirements for sites potentially contaminated with leaded and unleaded gas the following test methods are proposed: TPH-G (EPA. 8015-Modified Method), BTEX (EPA Method 8020), Total Lead (EPA Method 7420), an MTBE (EPA Method 8020). The soil samples will be placed in iced coolers for transport to the state-certified laboratory or given to the onsite, mobile laboratory. Proper chain-of-custody protocol will be followed always. MANAGEMENT OF EXCAVATED SOIL AND SITE RESTORATION PROCED RE As indicated above, excavated hydrocarbon-affected soils will be transported to the Forward, Incorporated Class II landfill facility in Manteca, California. Following remedial excavation and removal activities and final soil sampling, clean, onsite stockpiled soils will be recompacted in the excavation Imported non-contaminated soils will be compacted, as necessary, to bring excavation to grade The backfill material will be placed into the excavation with an excavator equipped with a co paction wheel. The backfill material will be placed in the excavation so that unnecessary particulate emissions will not be created. The material will be compacted in approximate six inch lifts to a minimum of 90% of laboratory maximum dry density pursuant to test method ASTM D1557. If the excavations are to remain open after work has been completed for the day berms of clean soil will be placed around the excavations to prevent water from entering the excavations. Additionally, the excavation area will be enclosed by temporary fencing to prevent trespassing into the area. W APRQ]EC7'S1102305%NRP0l,WPO