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Former Discovery Chevr•, January 27, 1998 <br /> Tracy. California Additional ub urface Investigation Work Plan I <br /> Task 2 <br /> I <br /> Collect laboratory soil samples at a minimum of five foot intervals at the locations shown on ii <br /> Figure 2 utilizing GeoProbe sampling equipment. The soil samples shall be collected until <br /> field screening with a portable organic vapor meter (OVM) indicates two consecutive f <br /> sampling intervals where no petroleum hydrocarbons are present. The sampling locations f <br /> have been selected in areas that should provide lateral and vertical definition of <br /> hydrocarbon-impacted soil. The low clearance heights inside the service bays and the <br /> concrete floors, should be accessible with a GeoProbe drilling rig. The GeoProbe has the <br /> i <br /> advantage of drilling through concrete either vertically or at angles up to 30 degrees off <br /> vertical, and it generates no soil cuttings. <br /> f <br /> Task 3 <br /> Collect laboratory groundwater samples from three Hydropunch"m locations (HP, Figure 2). <br /> The HP locations have been selected in areas that should complete the definition of the ,. <br /> extent of the groundwater plume (see historical Horizon Figure 2 - Site/Groundwater I <br /> Contour Map and Gettler-Ryan Inc. Figure 3 - Potentiometric Map in Appendix Q. <br /> li <br /> Task 4 <br /> I <br /> Deliver the soil and groundwater samples under Chain-of-Custody (COC) Documentation to <br /> a State-certified hazardous waste testing laboratory for analysis. Selected soil and the <br /> groundwater samples will be analyzed for TPHg and BTEX using Environmental Protection <br /> Agency (EPA) Methods 8015/8020 or 602. Based on the data previously collected it <br /> II <br /> appears that the oxygenated fuel additive compounds methanol, ethanol, tertiary butanol, <br /> MTBE, di-isopropyl ether DIPE ethyl tertiary butyl ether ETBE and tertiary( ), Y �' tY ( ), az'Y amYl <br /> methyl ether (TAME) are not released at this site and therefore not warranted for <br /> investigation. <br /> I <br /> 3001-13.wp 5 HORIZON ENVIRONMENTAL INC. <br />