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FROPi Ground zero Ana l q_i s PHONE N0. : 209 9'-2 9@'72 A_g. '-9 199, 04:59PP1 R2 GROUND ZMO ANALYSIS, INC. 119t W.March Lam, Suite 127D Stockton, California 95207 Telephone: (209)952-33481 Facsimile: (209) 952-9892 August 19, 1997 i Nt Mr. Doug Wilson San Joaquin County Public Health Services, Environmental Health Division P.O. Box 388 Stockton, CA 95201-0388 Subject, Results of Supplemental Soil Sampling at Roy's Towing 3570 East Miner Avenue; Stockton, CA (Figure 1) Dear Mr. Wilson: I am writing to transmit and briefly summarize the analytical results of soil samples recently collected from the subject property. Soil sampling and analysis was in accordance with the procedures proposed in the Preliminary Soil Remediation Plan dated June 19, 1997 and verbally approved by your office on July 25. Soil samples were collected under the observation of Mr. Robert McClellan with PHS/EHD. SAMPLII�LGs On July 28, 1997 a backhoe was used to open small test holes at the locations indicated on Figure 2. Soil samples were coilected from a depth of approximately 1 foot from all locations except proposed locaticn SS4, which was inaccessible. The sample collected from location BSS-1 at the depth of 1 foot was split into a number of duplicates for potential treatment testing. Discrete samples were also collected at this location at depths of 2; 3, and 4 feet to delineate the vertical extent of lead contamination. All samples were scaled in wide mouth jars and submitted under chain of custody documentation to Agricultural.and Priority Pollutants Laboratory (FLAP # 1312) in Fresno for analysis. ANALYSES: Samples were analyzed for soluble lead using the CA WET extraction("STLC" analysis). The untreated control sample collected from location BSS-1 was also analyzed for total lead, soluble lead by the CA WET method with deionized water as the extraction medium, soluble lead using the Toxicity Characteristic Leaching Procedure ("TCLP") and for pH.