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• <br /> Qom', GROUNDWATER <br /> 7tI� TECHNOLOGY, INC. <br /> u OIL RECOVERY SYSTEMS 1832 Tribute Road,Suite G,Sacramento,California 96816(918)921-1800 <br /> March 23 , 1988 <br /> Project Number 202/799-5031 <br /> Mr . James C. Wang <br /> Diamond Pri)perties, Inc . <br /> 2546 Derby Drive <br /> San Ramon, CA 94583 <br /> RE: DIAMOND PROPERTIES, INC. SITE <br /> LOCATED AT 4323 EAST MAIN STREET <br /> STOCKTON, CALIFORNIA <br /> Dear Mr. Wang: <br /> Enclosed is the laboratory analysis for soil samples collected by <br /> Groundwater Technology, Inc . (GTI ) during tank excavation at the <br /> above referenced site . Four diesel tanks and two waste oil tanks <br /> were removed and soil samples were collected about 4 feet below <br /> the bottom of the tanks as specified by San Joaquin Local Health <br /> District (S . J . L. H.D. ) requirements . <br /> All soil samples were analyzed as requested by S . J .L.H .D . for <br /> total petroleum hydrocarbons (TPH) as diesel , and benzene , <br /> toluene , ethylbenzene and xylene (BTEX) . Two soil samples <br /> collected from below the waste oil tanks and were also analyzed <br /> for polychlorinated bipheyls (PCBs) . The laboratory analyses <br /> indicated no levels above the Method Detection Limit (MDL) in any <br /> of the samples . The results of laboratory analyses indicate the <br /> above referenced site is, to the best of GTI ' s knowledge, free <br /> from hydrocarbon contamination for these parameters . <br /> Enclosed is the Chain-of-Custody and the laboratory report for <br /> the soil samples taken. Also enclosed is a copy of our Real <br /> Estate Transfer Risk Analysis (R.E.T .R .A. ) brochure. <br /> Offires throughout the U.S., Canada and Owrseas <br /> Western offices in: Tempe, AZ; Concord, CA; Sacramento, CA; San Diego, CA; <br /> Torrance, CA; Ventura, CA;Englewood, CO; Renton, WA <br />