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INC <br /> 6.0 HYDROCARBON AND CHLORINATED HYDROCARBON IMPACTED SOIL SITE <br /> CHARACTERIZATION <br /> 6.1 Field Procedures <br /> A California State Certified Engineering Geologist supervised drilling and excavating <br /> operations The supervision covered the separating and stockpiling of the clean and <br /> contaminated sod, on-site changes in excavation geometry, and the recording of <br /> encountered geologic and hydrocarbon contamination conditions as observed in the field <br /> The field determination regarding the presence or absence of hydrocarbon impacted soil <br /> was based on visual sample inspection for the presence of staining, odor, and OVM <br /> readings The presence of odor and staining in conjunction with positive OVM readings <br /> were used to establish the presence of hydrocarbon contamination in soil samples <br /> Determination of the absence of hydrocarbon contamination in a soil sample was based <br /> • on absence of odor, absence of staining and OVM readings no more than 20% of the <br /> range of background values Background OVM readings were established at the top of <br /> the excavation or soil borings to a depth not greater than five feet <br /> Field determination of contaminated soil was supported by collection of undisturbed sod <br /> samples in brass tubes every five feet using the protocol outlined in Appendix IV All <br /> samples collected were logged in a chain of custody document and transported to the <br /> analytical laboratory on ice All samples were logged into the analytical laboratory prior <br /> to 72 hours after the samples were obtained <br /> Cuttings from the soil borings were placed on a pad of 1 p-mil visqueen and covered <br /> pending analytical results and an approved soil remediation plan from SJCLHD <br /> 12270010 013 Page 18 <br />