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e a Geological Technics lnp ` Page 3 Former Moresco Property Soil Boring Report Project No.251:2 May 12, 1995 I the readings above background on a organic vapormeter (OVM). The OVM is a field portable photo ionization detector, that uses a 10.2 eV lamp to detect compounds with ionization potential below 10.2 eV (hydrocarbon range). The OVM will register concentrations as low 'as 0.1 ppm (parts per million). The boring log illustrates these screening observations . 2.3 Soil Sample Analyses All � -I � .. ' samples collected for possible an' yses were relinquished to Sherwood Laboratories of Hilmar (DHS# 1400). Geological Technics Inc. selected certain samples for laboratory analyses. These samples were tested for benzene, toluene, total xylenes and ethylbenzene (BTEX) by EPA method 8020 and Total Petroleum Hydrocarbons as Gasoline (TPH-Gas) ,by EPA Method 8015 modified. The 4 remaining samples :were placed on hold at the laboratory until the 30 day { holding time expired. A sample from SB-1 from the 19.5 - 20.0 foot interval was also tested for total Iead using EPA 7420. The detection limits for BTEX is 5.0 µg/kg (ppb), 1.0 mg/kg for TPH-Gas and 5.0 mg/kg 2.4 Borehole Closure After successfully collecting the bottom,hole soil sample the soil borings were closed by pumping a neat cement grout (augmented with <4% bentonite) using a r tremie pipe to grade with a slurry pump. All grouting was conducted under the L supervision of SJCPHSEHD personnel. 2.5 Disposition of Soil Cutting Soil cutting generated during the soil boring installation was added to the UST removal spoils stockpile. 3.0 RESULTS OF INVESTIGATION The data collected during this investigation have been summarized in the following sections. r 3.1 Site Geology I The detailed boring logs are attached in Appendix B and a geologic cross section is presented in Figure 3. i } c