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Geological Technics kc. <br /> 1101 7`h Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> Soil Investigation <br /> 3995 S. Hwy 99 <br /> Stockton, CA <br /> Project No. 1117.2 <br /> January 20, 2004 <br /> 1.0 INTRODUCTION <br /> On August 25, 2003 Geological Technics completed a Phase I Environmental site <br /> Assessment for Del Valle Property in regards to the subject property. A Recognized <br /> Environmental Condition on the site was a Former Underground Storage Tank (UST). The <br /> Property had a 7000-gallon UST south of a building labeled "welding shop" in San Joaquin <br /> County Environmental Health Department's file. All testing done at the time of the tank <br /> removal on March 18, 1987 was non-detect for BTEX, TPH-g, Tetraethyl lead, and <br /> Ethylene Dibromide. At the time San Joaquin County Environmental Health Department <br /> (EHD) did not require MTBE testing with tank removals. However, no closure was given <br /> for the site. According to Doug Wilson and Margaret Lagorio of EHD the reason the site <br /> was not signed off was that the detection limits for EDB, Lead & Xylene were exceeded. A <br /> note in the file stated that the site was not to be signed off because of this. <br /> A discussion with Margaret Lagorio of EHD regarding what needs to be done to achieve <br /> closure indicated that the levels were fine for EDB, Lead & Xylene, though the laws have <br /> changed and the site needs to be tested for the oxygenated fuel compounds. <br /> On November 18, 2003, we submitted a work plan to San Joaquin County EHD describing <br /> the location of the former UST and our proposed sampling plan. The purpose of this <br /> investigation was to determine if MTBE or the other main oxygenated fuel compounds are <br /> present in order to obtain closure from EHD. <br /> 2.0 PROPOSED INVESTIGATION <br /> To investigate the possibility of MTBE and the other oxygenated fuel compounds in the <br /> soil, Geological Technics Inc. performed the following investigation. <br /> 1. Tank location search, site and photo scaling <br /> 2. GeoProbe Drilling <br /> 3. Borehole logging & soil sample collection <br /> 4. Testing samples for MTBE by method 8260 <br />