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w, C3eofagica[Tecf ks Inc. Page 3 City of Escalon Soil&Groundwater Report Project No. 750.2 ,,.. March 15, 1999 All non-disposable sampling equipment was decontaminated using a steam cleaner before •r and between uses. 'Disposable gloves were used while collecting all samples and were changed with each sampling event. ,+ A chain of custody document, listing all samples collected, accompanied the samples from field to laboratory, thereby providing a means to track their movement and insure their integrity. 1.4 Soil and Groundwater Sample Analyses The following summarizes the sample testing used for this phase of work. The samples were �. submitted to a licensed analytical laboratory (Sherwood Laboratories in Hilmar) and analyzed for the following: • Benzene, Toluene, Ethyl Benzene & Xylene (BTEX by EPA method 80201602) • Total Petroleum Hydrocarbons as Gasoline (TPH-G by EPA method 5030/8015(m)) .. • The fuel oxygenate suite (MTBE, ETBE, TAME, DIPE & TBA by EPA method 8260) • The 61 foot soil sample from HP-5 was run for the full 8260 scan. A summary of the lab data is attached in Table 1 of Appendix A and the lab data reports are attached in Appendix C. V 2.0 RESULTS OF INVESTIGATION .. The six hydropunch/boreholes were installed as planned and the following information was gathered. 2.1 Geology and Hydrogeology of the Site The dominant soil type in the upper 60 feet of subsurface geologic soils investigated is sand, with fine to coarse-grained texture. Varying amounts of silt and silty sand were encountered from borehole to borehole. A couple non-continuos clay layers were encountered in a few of the boreholes. Groundwater was encountered at 60-61 feet. The capillary fringe did not appear to extend up very far. The soil was generally moist from the surface to the groundwater interface. A hydrocarbon odor was observed in HP-1 and HP-5 from the surface down to total depth. Both HP-2 and HP-3 exhibited a slight solvent type odor at 55 feet, which was probably result of MTBE. HP-4 showed moderate OVM readings and HP-6 showed low OVM readings at 50 and 55 feet. A geologic cross section is included as Figure 3 and the boring logs are included in Appendix B. 2.2 Chemical Distribution Data Table 91, enclosed as Appendix A, summarizes the soil and hydropunch sample ,,. analyses collected in this portion of the property. Lab test results corroborate well with field observations and are discussed below. 4