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GROUNDWATER <br /> E]F C G JAN 1 <br /> TECHNOLOGY, INC.C 1832 Tribute Roel Suite�.,�sq=—r dt-b 16(916)921-1800 <br /> �J OIL RECOVERY SYSTEMS -' <br /> March 23 , 1988 <br /> Project Number 202/799-5031 STS /� T <br /> Mr . James C. Wang <br /> Diamond Praperties, 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 /> Offices throughout the U.S., Canada and Overseas <br /> Western offices in: Tr,npe, AZ; Concord, CA; Soaamento, CA; San Diego, CA; <br /> Torrance, CA, Vmtura, CA;Englewood, CO ;Renton, RA <br />