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1! <br /> Margaret Lgono <br /> C A M B R l A MS February 6a 2001 <br /> 1998 Groundwater Monitoring Well Installation- In 1998, three groundwater monitoring wells <br /> (MW-1, MW-2 and MW-3) were installed at the site No TPHg, benzene, toluene, ethylbenzene <br /> and xylene isomers (BTEX) or methyl tertiary butyl ether (MTBE) were detected in soil samples <br /> collected from MW-2 and MW-3 Only low concentrations of these analytes were detected in <br /> soil samples from MW-1 <br /> Groundwater Monitoring Since wells MW-1, MW-2, and MW-3 were installed, the site has <br /> been monitored quarterly for TPHg, BTEX, and MTBE <br /> INVESTIGATION PROCEDURES <br /> Cambria advanced six CPT borings to delineate the vertical and lateral extent of hydrocarbons in <br /> soil and groundwater on and offsite Soil and groundwater samples were collected from the CPT <br /> bortngs <br /> The procedures for this investigation are summarized below Analytical results for soil are <br />. summarized in Table 1 and presented as Attachment A Groundwater analytical results from CPT <br /> grab groundwater samples are summarized in Table 2 and presented as Attachment A Cambria's <br /> standard field procedures for CPT borings are presented as Attachment B The CPT site <br /> investigation report provided by Gregg Drilling is presented as Attachment C <br /> Personnel Present. Shannon Couch, Staff Geologist, of Cambria <br /> Permits San Joaquin County Health Services Environmental Health Division <br /> Permit#s 0024665 and 0024666(Attachment D) <br /> Drilling Company Gregg Drilling of Martinez, California(License#485165) <br /> Drilling Dates• December 5-7, 2000 <br /> Drilling Method. CPT <br /> Number of Borings Six, CPT-1 through CPT-6 <br /> Boring Depths 45 11 to 45 44 fbg <br /> 2 <br />