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Eckert Cold Storage Company <br />' 757Moffat Blvd, Manteca, California November 26, 1997 <br /> Underground Tank Investigation, Continued Phase I Report of Findings Page: 4 <br /> sampling methods, date and time of sampling, the number of well volumes removed <br /> ' before sampling, preservatives added (if any), and any filtration performed on samples. <br /> The samples were immediately refrigerated for delivery to the laboratory and were <br /> under no circumstances opened by anyone other than laboratory personnel. Chain of <br /> Custody records were maintained at all times(Appendix B). <br /> 3.4 Soil Sampling <br /> All soil sampling equipment was thoroughly steam-cleaned before and between <br /> sampling to prevent cross contamination. Relatively undisturbed soil samples were <br /> taken at intervals of not more than 5 feet in order to evaluate the subsurface materials, <br /> ' however, this sampling interval was waived in saturated sands in which sample <br /> recovery was not possible. <br /> ' The soil samples were taken using a California Modified Split Spoon sampler with <br /> brass liners. The sampler were driven continuously by the overdriliing method. <br /> • Soil samples collected for analysis were analyzed using EPA method 8020 for MTBE <br /> &BTX&E, method 5030/LUFT for TPH Gasoline and 3550/LUFT for TEPH-Diesel. <br /> Analyses were conducted by California Laboratory Services, a State-certified lab in <br /> ' Rancho Cordova, California. <br /> 3.5 Groundryater Sampling <br /> A travel blank provided by the laboratory accompanied the sample vials from the time <br /> they are picked up from the lab to the time they are delivered to the lab. This travel <br /> blank is listed on the Chain of Custody, but was analyzed only if all samples contained <br /> ' the same contaminants. <br /> All sampling equipment including the pump, bailer, and cables, used by sampling <br /> personnel, were disassembled, if appropriate, and steam-cleaned prior to <br /> commencement of sampling. These procedures were followed between each well, <br /> sampling point, and at the end of the sampling day. De-ionized or organic-free water <br /> ' (also provided by the laboratory)was then introduced into the pump or bailer as a final <br /> stage of cleaning. This water was then pumped or gently poured into sample vials to <br /> be used as pump or bailer blanks. These blanks were tested only if their corresponding <br /> samples are found to contain contaminants. <br /> Immediately prior to sampling, water levels and well depth measurements were taken <br /> ' in all wells at the site. Each well was evacuated using a stainless steel bladder pump, <br />