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Stockton Wreck i ya, 2 November 16, 1990 <br /> 09% <br /> SITE DESCRIPTION AND SAMPLING <br /> The site is currently vacant of any structures with the exception of the slab <br /> floors for facilities once associated with the wrecking yard operation. It is our <br /> understanding that the wrecking yard has not been in active operation for over, ten <br /> years. The site is currently covered with low growing weeds and has several trees. <br /> A total of five soil samples with duplicates were collected from the site at the <br /> approximate Iocations identified on Figure 1. Sail samples were obtained from the <br /> site on September 26, 1990, and the entire sampling process was observed by Mr. <br /> 3weeso. The samples were collected from depths of six to twelve inches below the <br /> existing ground surface. Three samples were taken from what was once the <br /> automobile and truck dismantling area (Samples 1-1, 2-1 and 3-1). In addition, two <br /> samples were collected near the perimeter of the site (Samples 4-1 and 5-1) to <br /> determine, possible background levels of the contaminants of interest_ Soil sampling <br /> was accomplished using a manually operated soil auger and a 2.5-inch diameter <br /> hand-driven sampler equipped with 2.5-inch diameter stainless steel sleeves. All <br /> sampling equipment was cleansed in a solution of tri-sodium phosphate (TSP), rinsed <br /> with ordinary tap water, and rinsed again with de-ionized water prior to sampling <br /> and between sample intervals to minimize the possibility of cross-contamination. <br /> Soil samples were immediately sealed with TeflonTm film, capped, and placed on ice for <br /> transport. Samples were handled and transported to a California certified analytical <br /> laboratory according to proper United States Environmental Protection Agency <br /> (USEPA) protocol, observing chain-of-custody procedures. A copy of the chain-of- <br /> custody log is included in Appendix A. <br /> ANALYTICAL METHODS AND TEST RESULTS <br /> All samples collected were tested for the total concentrations of cadmium, <br /> chromium, lead and nickel by the USEPA Methods 7130, 7190, 7420, and 7520, <br /> respectively. Procedures for these methods were followed in accordance with USEPA <br /> Test Methods for Evaluating Solid Waste SW-846. The laboratory report detailing the <br /> results obtained and minimum detection limits used is included in Appendix A. Also <br /> presented in the summary below is the Total Threshold Limit Concentration (TTLC) <br /> values cited in California Code of Regulations (CCR), Title 22, Chapter 30, Article 11, <br /> ES-0497-SNI 901 I-E038.LTR <br />