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Soil Boring Installation Page 4 <br /> 8700 Thornton Road.,Stockton <br /> GPE Project 639.2 <br /> June 13,2011 <br /> depositional changes that have occurred in the sediments). A PID organic <br /> vapor meter was also used to screen for volatile vapors that might emanate <br /> from the core material. Groundwater was not encountered in these borings. <br /> All sampling equipment was thoroughly cleaned before and between uses. <br /> The boring logs are attached as Appendix B. <br /> ' In general, the material from 0 to about 12 feet consisted of apparent pit fill <br /> material: mixed soils and what appeared to be old pavement fragments, from <br /> 12 feet to the base of the borings, the predominant soil type was a fine to <br /> medium grained sand. No field evidence was found to suggest the presence of <br /> contamination. <br /> ' 2.1.4 Soil Sampling and Analysis <br /> Upon reaching total the depth of each boring, a soil sample consisting if the <br /> lowest 1-foot of sample core was sealed, labeled and saved for later laboratory <br /> Each sample container was immediately transferred to a cooler chilled with <br /> ' water ice for transport to the laboratory under chain-of-custody. <br /> A chain-of-custody document, identifying the sample and the intended <br /> analyses, accompanied the sample from the field to the laboratory, thereby <br /> providing a means to track its movement and insure sample integrity. The <br /> samples were transported to Argon Labs, of Ceres, California, for analysis, <br /> and tested as follows: <br /> • Total Extractable Petroleum Hydrocarbons (TEPH-D) by EPA method 8015(m) <br /> • Total gasoline range Petroleum Hydrocarbons (TPH-G) by EPA method 8015(m), and <br /> • BTEX Volatile Organic Compounds using EPA method 8021. <br /> The following table summarizes the detection limits of various constituents: <br /> ' <br /> Compound TPH-G TPH-D BTEXMTBE <br /> Detection Limit 1 5 0.005 0.05 <br /> Units Mg/Kg Mg/Kg Mg/Kg Mg/Kg <br /> ' None of the petroleum constituents tested for was detected in any of the three <br /> samples. <br /> 2.2 Waste Disposal <br /> No waste soil cuttings were generated while drilling except for hand auger <br /> cuttings from the upper 5 feet of each boring. These cuttings were disposed of <br /> 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 <br /> Modesto, Ca 95356 Fax: (209)569-0295 <br />