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FPON rro and Zc—= =u-��1 yS i� PRONE HO. 952 9992a _X_ 02 19 1 R12 GROUND ZERO ANALYSIS, INC. 2291 W.March Lane, Suite 127D Stocldour CaLtfornia 95207 Telephone: (209) 952.3481 Facsimile: (209) 952-9891 ' r April 18, 1997 �tJ `LJ Ms. Lisa Brown, Esq. Office of the District Attorney P.O. Box 990 Stockton, CA 95201 Subject: Report of Investigation - Soil Sampling at Roy's Towing 3570 East Miner Avenue, Stockton, California Transmittal of Report and Summary of Results Dear Ms. Brown: Enclosed is your copy of our Report of Investigation concerning the recent soil and septic tank sampling at the subject property. The investigative procedures and results as well as our conclusions and recommendations are briefly summarized below. A copy of the report has also been submitted to Mr. Doug Wilson with San Joaquin County Public Health Services/Environmental Health Division (PHS/EHD) for his review and comment. PURPOSE OF INVESTIGATION Ground Zero Analysis, Inc. ("GZA") was retained by the responsible party to conduct a soils quality evaluation at the subject property. The purpose of the work was to investigate the property for the presence of contamination, Per GZA's approved Workplan, sampling focused on areas of contamination identified during previous investigations; the sump and septic tank beneath the building and the leach lines and pit south of the building and; random sampling in areas of the property previously uninvestigated. SAMPLING METHODS During the week of February 24, 1997, GZA personnel collected 23 soil samples at various locations on the property. The locations of the sampling points were approved by PHS/EHD. Sampling was conducted under the supervision of PHS/EHD personnel. Backhoe trenches and hand auger borings were used to collect soil samples from the depths of 1 foot and 5 feet at most locations. Samples from beneath the sump and leachline were collected