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23 June 1998 <br /> AGE-NC Project No. 96-0229 <br /> Page 5 of 5 <br /> 4. Decontaminate all sampling equipment in an alconox solution and rinse twice with water <br /> prior to each sampling run. Steam clean down-hole equipment before advancement of each <br /> boring. <br /> 5. Soil samples are to be collected adjacent each CPT boring at 10-foot intervals or in areas of <br /> lithologic variance,beginning at 20 feet bsg. Soil samples will be collected utilizing a piston <br /> soil sampler loaded with pre-cleaned 2-inch diameter brass sleeves. <br /> 6. Preserve soil in the brass sleeve by covering both ends with Teflon sheets, capping, and <br /> sealing with tape. <br /> 7. Label each preserved sample with location, boring designation, depth, date, time and <br /> sampler's initials. <br /> 8. Store the samples under ice and transport the samples in a chilled ice chest to a state-certified <br /> laboratory for analysis. <br /> 9. Screen soil sample duplicates for the presence of volatile organic'compounds using a photo- <br /> ionization detector(PID)pre-calibrated to isobutylene. <br /> 10. Log borings in accordance with the Unified Soil Classification System(USCS,as per Visual <br /> Classification of Soils, 1986, Bureau of Reclamation Engineering and Research Center). <br /> 11. Analyze selected soil samples for TPH-g, BTE&X, MTBE, DIPE, TBA, ETBE, TAME in <br /> accordance with the appropriate EPA methods. <br /> 12. Following borehole advancement, a grout mix will be utilized to backfill each borehole <br /> utilizing a tremie pipe. The PHS-EHD will be given the opportunity to inspect the grout mix <br /> prior to backfilling activities. <br /> 4.4. REPORTING <br /> A report detailing the results of the investigation will be prepared. The report will be in a format <br /> acceptable to the PHS-EHD and CVRWQCB and will include recommendations for additional <br /> investigation/remediation, if appropriate. The report will be reviewed and signed by a California <br /> Registered Geologist. <br /> Advanced GeoEnvironmental,Inc. <br />