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rt � <br /> c Y 3P i <br /> E <br /> PRELIMINARY_11'YDROGEOLOGIS_T ASSESSMENT REPORT <br /> 14800 West Frontage Road <br /> Manteca, California <br /> —» Delta Project No.40.8"79 <br /> Page 12 <br /> • Collection of soil samples at 5-foot intervals during drilling of all additional monitoring wells. <br /> • Submission of selected soil samples (selection based on results of field-screening samples with <br /> an hNu PID for total organic vapors) to a California-certified laboratory to be analyzed for <br /> BTEX,EDB, EDC,and TPH. <br /> • Development and sampling of all additional monitoring wells at the site(MW-5 through MW-8). <br /> • Submission of ground water samples to a California certified laboratory to be analyzed for BTEX, <br /> EDB, EDC, and TPH. <br /> • Collection of water level data from all wells (MW-1 through MW-8) in order to construct a <br /> ground water level contour map. <br /> • Preparation of a Phase II Hydrogeologic Assessment report presenting results of the activities <br /> outlined above and recommendations (as needed) for any soil and/or ground water remediation <br /> r_ activities at the site. <br /> L <br /> 6.0 141EI'IiIODS AND PROCEDURES <br /> 6.1 Drilling and Soil Sampling <br /> On April 26, 1989, two monitoring well soil borings were drilled using a mobile B-53 drilling rig and 8- <br /> inch-diameter, hollow-stem augers. The soil borings were advanced at the site to a maximum depth of <br /> 45 feet below grade- Samples of subsurface soils were obtained using a California modified split-spoon <br /> sampler. Five samples were collected and examined from each of the four soil borings. Representative <br /> soil samples were collected in glass jars. Headspace gas measurements of total organic vapors were made <br /> with an hNu PID. The readings from the hNu meter are recorded on the soil boring logs presented in <br /> Appendix A <br /> All dritling and sampling equipment was cleaned before drilling each boring using a high-pressure,steam- <br /> cleaning apparatus. The split-spoon sampler was cleaned with phosphate-free soap and rinsed with water <br /> --- --- = - following each sample collection. ---- - -- - -- - - -- <br />