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Laboratory Analysis <br /> Soil vapor, soil, and groundwater samples were analyzed on site by Monroe Laboratories, <br /> Inc , a Department of Health Services (DHS)-certified mobile laboratory All samples were <br />' analyzed for BTEX, as well as TPH gas by EPA Methods 8020 and EPA Modified <br /> Method 8015, respectively fn addition to providing numerical results, the laboratory also <br /> provided chromatographs for each positive result <br /> ISite Cleanup/ Residual Management <br /> On completion of soil and groundwater sampling, boreholes were sealed in place with a <br /> grout mixture of Type II cement with 4% pure sodium bentonite The grout was pumped <br /> through a 1-inch diameter grouting tube positioned at the bottom of each borehole All <br /> investigation-derived residuals were containerized in labeled, 55-gallon drums and left at <br /> the former Cardlock gas station site for disposal by Boettcher Western Properties III, Ltd <br /> Quality Assurance - Quality Control <br /> QA/QC procedures included <br /> IStandard laboratory instrument calibration, consistent with state and federal <br /> standards. <br /> • All downhole sampling equipment was steam cleaned and washed in a trisodium <br /> phosphate (TSP) solution at the beginning of the day and after removal from each <br /> borehole <br /> • Background air samples were collected and evaluated with the HNu meter to <br /> comply with the site Health and Safety Plan <br /> • All samples were collected under the supervision of a registered civil engineer <br />' p yob%940549kapon doc 5 940549 00 <br /> i <br />