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Cone Penetrometer Assessment Report 5 Ranch Market,23569 South Santa Fe Road,Riverbank Califomia November 20,2001 I I amounts of clay The lithology is interbedded with silt, clay, and sand as follows generally sandy silt between grade and 10 feet bgs, silty sand and sand to 20 feet bgs, silt and clayey silt to 32 feet bgs, and interbedded sands, gravelly sands, and silts to 75 feet bgs No obvious low permeability, confining layer of clay or silty clay was observed in the continuous core samples collected from soil borings SB-1 or SB-2 Cross sections with the CPT borings are presented in Figures 5 and 6 SCOPE OF WORK Site Specific Health and Safety Plan, Permitting, and Utility Clearance SECOR used the existing site-specific Health and Safety Plan to cover the activities proposed at the Site as required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910 120) The document was reviewed and signed by all SECOR personnel and subcontractors performing work at the Site Permits for soil borings were obtained from the SJCEHD (Attachment 3) Existing access agreements were used for drilling on private property An encroachment permit was obtained • from San Joaquin County Public Works Department for CPT-3, located within the public right- of-way Prior to conducting subsurface work at the Site, Underground Service Alert (USA) was contacted to delineate subsurface piping near the Site with surface markings SITE ASSESSMENT Cone Penetrometer Testing and Vertical Water Sample Collection On October 12, 2001, SECOR supervised the drilling of soil borings CPT-1 to approximately 42 feet bgs, CPT-2 to 40 feet bgs, and CPT-3 to 65 feet bgs, using a CPT ng (Figure 2) CPT-1 and CPT-2 were each proposed to be drilled to 65 feet bgs, but met refusal at approximately 40 feet bgs Due to dnll rig refusal at 40 feet bgs in CPT-2, boring CPT-2A was advanced to approximately 76 feet bgs (Field Notes, Attachment 4) A summary of proposed water sample collection depths and actual sample depths are summarized in the table below Pile Ranch Market\Reports\Rb-CPT install