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a1 a <br /> ! Ms Lori Duncan Project 20805-140 010 <br /> May 13, 1999 <br /> Page 4 <br /> California licensed drilling contractor performed the drilling and well installation <br /> activities <br /> Soil borings were drilled using 8-inch diameter hollow stem auger drilling equipment for <br /> drilling AS-1, AS-2, and AS-3, and a 10-inch hollow stem auger for drilling the dual <br /> completion well VW-5S and VW-5D Soil samples were collected at five-foot intervals <br /> using a modified California Split Spoon Sampler fitted with brass sample tubes <br /> Sampling equipment was cleaned with alconox and rinsed after each sample interval A <br /> Pinnacle geologist prepared exploratory boring logs consistent with the Unified Soil <br /> Classification System Soil samples were field screened for petroleum hydrocarbon <br /> impacts by conducting head space analysis with a portable photoionization detector <br /> (PID) PID readings were listed on the boring logs <br /> HydroPunch samples were collected at the termination depth of the air sparge borings <br /> Drilling and sampling methods are discussed in detail in Appendix A Exploratory boring <br /> logs and well details are presented in Appendix B <br /> Soil samples were preserved for laboratory analysis by sealing the tubes with Teflon tape <br /> and plastic end caps and placing them in an ice chest pending laboratory analysis <br /> The three 8-inch diameter borings were converted to 2-inch diameter air sparge wells <br /> The 10-inch diameter boring was converted into two 2-inch diameter vapor extraction <br /> wells All five wells were constructed using schedule 40 polyvinyl chloride casing <br /> Screen intervals were installed approximately between 47-48 feet bgs in well AS-1 and <br /> AS-2, between 49-50 feet bgs in well AS-3, between 20-35 feet bgs in well VW-5D, and <br /> between 5-15 teet bgs in well VW-5S <br /> All five wells were developed consistent with methods presented in Appendix C Field <br /> sheets are presented in Appendix D <br /> ANALYTICAL RESULTS <br /> Soil and groundwater analytical results are presented and the extent of impacts are <br /> evaluated <br /> Soil Sample Analytical Results <br /> Soil samples collected from exploratory borings contained detectable concentrations of <br /> petroleum hydrocarbons TPHG was detected at concentrations ranging from 7830 <br /> CP\E 1gRCO105481RFPORTS10548P201 DOC-481Esg 1 �colacC�CPC <br /> A-4 <br />