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C LEARWAT <br /> EF <br /> G R 'O U P, I N C. ; <br /> 2.0.FIELD ACTIVITIES <br /> 2,1 Soil Borehole Drilling and'Soil Sampling <br /> I <br /> Allwork was performed according to, Clearwater's Well Installation and <br /> _ � _ <br /> Groundwater Sampling Protocols (Appendix A) and under the';`directives and. <br /> guidelines established by the PHS/EHD and-the Regional Water Quality Control <br /> ,Board._ _Soil borehole drilling and well" installation •was conducted by. Mitchell <br /> Drilling' Environmental (MDE) of Rancho Cordova, California under the . <br /> supervision of Clearwater on March 31, -1995.' Prior to commencement 'of•drilling <br /> 'activities, safety briefings were held with,,personnel of MDE. At the end-,of the <br /> briefing, 'all personnel reviewed and signed the Site Safety Plan (Appendix B). <br /> MDE used"a CME 75 drill rig.-to- drill.•three' eight-inch diameter soil" borings; <br /> designated MW-1 through MW-3,; to total depths of t 60 feet below ground surface''fts). A CA-rnodified split-spoon sampler lined with three two-inch diameter brass <br /> tubes was used to collect soil samples ,at five-foot intervals from the soil borings. <br /> As proposed in the project workplan; four samples from each boring were retained, <br /> for laboratory analysis. The samples were collected from intervals•showing the <br /> highest concentrations of volatile vapors, as measured• using a Microtip MP1000' <br /> 'Organic Vapor Meter (OVM . All samples for analysis were labeled, documented on <br /> a chain-of-custody form, and placed in. a 'cooler for transport to Trace Analysis . <br /> Laboratory, Inc. (TAL), a DHS-certified analytical laboratory located in Hayward, <br /> California. The soil samples were analyzed. for concentrations of total gasoline- <br /> range' hydrocarbons '(TPHg) and total diesel-range hydrocarbons (TPHd)' by EPA <br /> Method 8015 (LUFT modified) and for benzene, toltiene, ethylbenzene and xylene <br />�• isomers (BTEX)",-by.EPA Method 8020 (LUFT modified). <br /> Portions•of each soil sample were retained for visual sedirnentologic description by'a <br /> =Clearwater- geologist using the.Unified Soil Classification System, and for.volatile <br /> organic headspace analysis'using an OVM. °OVM readings are presented on�the Soil <br /> Boring Log and Well•Constnzction Diagrams in'Appendix C. Soil cuttings generated <br /> - ,from "drill'ing,were added .to- the existing:tank excavation 'soil piles pending future <br /> removal. :f <br /> D-105 PSA, 2 V .May 25, 1995 <br />