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ERI 205503 ROt Unocal Service Station 5886, Stockton California June 3 1997 <br /> . 3;5 Analytical Methods <br /> 3.5.1 Soil Samples <br /> Selected soil samples collected from the borings were submitted under Chain of Custody Record to <br /> Sequoia (California State Certification Number 1210) in Redwood City, California Soil y •i samples <br /> selected for analyses include the samples collected directly above first encounter groundwater and <br /> samples producing the highest PID readings The Chain of Custody Records are attached (Appendix <br /> F) Soil samples were analyzed for TPHg, total extractable petroleum hydrocarbons and diesel <br /> (TEPHd), BTEX, and MTBE using the methods listed in Table 1 <br /> Additionally, selected soil samples collected from the soil borings were submitted under Chain of <br /> Custody Record to PTS Laboratories, Inc in Santa Fe Springs, California Soil samples were <br /> analyzed for moisture content, grain size, vertical permeability, bulk density, total organic content, <br /> pH, and soil porosity The results of these analyses and Chain of Custody are attached (Appendix F) <br /> ERI also collected and submitted a composite soil sample from the drill cutting stockpile under Chain <br /> of Custody Record to Sequoia The composite sample was analyzed for TPHg, BTEX, MTBE, and <br /> TEPHd, and total threshold limit concentration (TTLC) lead using the methods listed in Table 1 <br /> I <br /> 3 5.2 Groundwater Samples <br /> Groundwater samples collected by MPDS from groundwater monitoring wells MW 1 through MW3, <br /> MW413 through MW71), and MW4S through MW7S were submitted under Chain of Custody Record <br /> to Sequoia in Walnut Creek, California The Chain of Custody Records are attached (Appendix G) <br /> Groundwater samples were analyzed for TPHg, TEPHd, BTEX, and MTBE using the methods listed <br /> in the MPDS report (Appendix G) <br /> 5 <br />