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Selection for laboratory analysis will be based upon <br /> field evidence of contamination ( PID readings , <br /> discoloration, odors) and site stratigraphic changes. <br /> In any case, at least one sample will be analyzed for <br /> each 10 feet of boring. Two consecutive "clean" samples <br /> will be collected to document the vertical extent of <br /> contamination within a boring. Analyses will be <br /> conducted for STEX and TPHG, by Sequoia Analytical (DHS <br /> ' cert. #145 ) . Analytical methods, sample containers, <br /> holding times, and means of preservation are listed in <br /> WaterWork' s QA/QC Plan (Appendix III ) . <br /> ' 3. All drill cuttings will be placed on and covered with <br /> plastic sheeting, and remain on-site pending laboratory <br /> results. Thereafter, a proposal for treatment or <br /> ' disposal of the excavated material will be prepared. To <br /> avoid cross-contamination, drilling augers will be <br /> steam-cleaned before drilling each borehole. Water used <br /> ' to clean the augers after drilling each boring will, be <br /> collected and stored in drums approved for hazardous <br /> liquid storage pending laboratory analysis. <br /> ' 4. All site activities involving potential contact with <br /> hazardous materials (i.e. gasoline contaminated soils ) <br /> will be conducted in accordance with WaterWork' s Health <br /> ' and Safety Plan (Appendix V) . <br /> 5. A Problem Assessment report will be prepared according <br /> to Regional Board Guidelines summarizing the findings of <br /> the investigation and recommending remedial action <br /> alternatives, as appropriate. The field investigation <br /> ' will be conducted under the direct supervision of <br /> Russell W. Juncal, CA Registered Geologist No. 3864, and <br /> Nora Kataoka, CA Registered Civil Engineer No. 38322 . <br /> The appropriate individual will review and sign the <br /> assessment report. <br /> Following agency approval the estimated time necessary <br /> ' to complete the tasks proposed in this workplan is 8 <br /> weeks. Actual time may vary depending on drill rag <br /> availability, laboratory turn-around and unforeseen <br /> ' circumstances. <br /> 5 .0 REFERENCES <br /> ' California Regional Water Quality Control Board, San <br /> Francisco Bay Region, June 2, 1988 (revised May 18, 1989 ) , <br /> ' <br /> Regional Board Staff Recommendations for Initial <br /> Evaluation and Investigation of Underground Tanks. <br /> State of California, Department of Water Resources 1981, <br /> Water Well Standards: State of California, Bulletin 74- <br /> 81, 92pp. <br /> 5 <br /> 1 <br />