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r Beacon Station No 641 June 15 2000 <br /> Stockton California Results of Additional Subsurface Investigation <br /> probe was inserted into the bags and the PID readings, in parts per million (ppm), were <br /> recorded on the monitoring well log <br /> Soil boring B3 was drilled to approximately 60 feet bsg and backfilled to the surface with <br /> grout The monitoring wells were drilled to approximately 55 feet bsg and constructed with <br /> 2-inch diameter, schedule 40 polyvinyl chloride (PVC) casing and 0 020-inch slotted screen <br /> well screen A#3 sand filter pack was placed adjacent to and approximately three feet above <br /> the screened intervals Approximately two to three feet of bentonite filter seal was placed on <br /> top of the filter pack The remaining annular space was filled with a neat cement sanitary <br /> seal The well heads were covered by traffic-rated vault boxes Construction details for the <br /> monitoring wells are included in on the boring logs <br /> A total of 45 soil samples were collected from the four soil borings as noted on the boring <br /> logs Eleven soil samples were selected for chemical analysis and submitted to Kiff Analytical <br /> (Kid in Davis, California (Cert #2236) The soil samples were analyzed for total petroleum <br /> . hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) and methyl tertiary butyl ether (MTBE) by Environmental <br /> Protection Agency (EPA) Method 8260B The 35-foot soil sample from soil boring B3 was <br /> analyzed for the suite of seven fuel oxygenates consisting of MTBE, di-isopropyl ether <br /> (DIPE), ethyl-tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME) and tertiary <br /> butyl alcohol (TBA), methanol and ethanol by EPA Method 8260B Soil analytical results, <br /> reported in milligrams per kilogram (parts per million or ppm), are summarized in Table 1 <br /> Analytical data reports are contained in Appendix D <br /> Four soil samples (SP-1 A,B,C,D) were collected from the cuttings stockpile generated <br /> during drilling of the soil borings The stockpile samples were submitted to Koff, composited <br /> into one sample and analyzed for TPHg, BTEX and MTBE by EPA Method 8260B, and lead <br /> by EPA Method 6010 Drill cuttings stockpile analytical results are summarized in Table 1 <br /> The drill cuttings were transported off site on November 11, 1999 by Dillard Environmental <br /> 641 Add5bsrfcIvest5-00 doc 5 HORIZON ENVIRONMENTAL INC. <br /> 164114 <br />