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April 7, 1992 —� � <br /> ARCO Service Station No 76(}, Lodi, California <br /> i <br /> During sampling, a PID was used to characterize the relative levels of hydrocarbon vapors <br /> emitted by soil samples Field instruments such as the PID are useful for indicating relative <br /> levels of hydrocarbon vapors but do not detect the concentration of hydrocarbons present <br /> with the same precision as laboratory analysis PID readings recorded in the field are shown <br /> on the Logs of Bonngs <br /> Vapor-Extraction Well Construction <br /> Bo g 5=9—B=1�;and-' - were drilled to aU�rpximately 26-112—feet below grade a <br /> 1 va or- n cells VW-L_V_W-2,_and_V_W_3 wereconstructed in the fionng Details of <br /> vapor-extraction well construction are shown on the Logs of Borings (Appendix B) <br /> Lgboratoly Analyses and Results <br /> 1 <br /> Soil samples collected were analyzed at California Analytical Laboratories -Enseco in West <br /> Sacramento, California (Hazardous Waste Testing Laboratory Certificate No E771), for <br /> total petroleum hydrocarbons as gasoline (TPHg) and for benzene, toluene, ethylbenzene, <br /> and total xylene isomers (BTEX) by methods outlined by the California Regional Water <br /> Quality Control Board in their Tri-Regional Board Staff Recommendations for Prelimina <br /> Evaluation and Investigation of Underground Tank Sites dated August 30, 1990 (Tn- <br /> Regional Guidelines) Copies of the laboratory Analysis Reports are attached Copies of <br /> the Chain of Custody records and laboratory reports are included in Appendix B <br /> Results of laboratory analyses of the soil samples collected from the borings (Table 4) <br /> indicated toal_xyleae� omers wee refected at a c�Aentra�lan�of0 0073 parts per millio <br /> �(�p�1�`in t e soil sample collected from feet below grade in bonng B- sample S-20-B9) <br /> Concentrations of TPHg and BTEX were below detection limits in the other samples <br /> analyzed <br /> 38048-5 5 <br />