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,ms <br /> SO <br /> Following laboratory analyses of samples on-site, some soil <br /> determined to be contaminated may be excavated and stockpiled if the <br /> contamination is localized and easily accessible. If soil <br /> contamination is found to be wide spread or otherwise involves the <br /> excavation of an inordinate amount of clean soil to access <br /> contaminated soil, then no further soil will be excavated. In no case <br /> will more than 25500 yards of soil be excavated. Clean soil will be <br /> segregated from contaminated soil. No additional excavation on the <br /> west side of the excavation is anticipated at this time in order to avoid <br /> causing possible ground instability in El Dorado Street. <br /> Soil samples will be taken at 5 foot intervals, or at significant <br /> lithologic changes in the soil, beginning at 5 feet below the ground <br /> surface. All samples will be examined in the field for evidence of <br /> contamination. Examination will include visual observations, <br /> detections of odor, and readings from a photoionization detector <br /> (PID). Selected soil samples will be submitted for immediate <br /> laboratory analysis in an on-site mobile laboratory. Samples for <br /> immediate analysis will be selected for purposes of determining if <br /> groundwater has been impacted and to confirm clean zones. Soil <br /> samples exhibiting obvious staining or odors will either not be <br /> �- analyzed or will be analyzed later to confirm contaminated zones. <br /> Soil borings will be made by a mobile truck mounted drill rig using <br /> hollow stem augers. Soil samples will be taken with a California <br /> modified split-spoon sampler fitted with brass tube liners. <br /> VA All brass liners will be steam cleaned prior to use. All augers, bits, <br /> and split spoon samplers will be steam cleaned prior to be <br /> work and between all borings. <br /> -�. Soil samples will be collected by inserting the sampler into the augers <br /> and hammering it into the soil to the desired depth. The sampler <br /> will then be removed from the augers and the brass liner containing <br /> the sample will be removed from the sampler. The soil sample will <br /> be examined for evidence of contamination. Any brass tubes <br /> containing samples exhibiting evidence of contamination will be <br /> covered with Teflon tape and capped with plastic caps to make <br /> airtight seals. The brass tube will be labeled with the boring number, <br /> ---_sample interval-_d..epth,--sampler's-initials,-date,-time location-and---------- ---------- - <br /> The sample will be Iogged on a chain-of-custody <br /> form and in a field book, and noted on the boring log. (A samplc. <br /> Chain-of-Custody form is shown in Appendix C. .A sample boring log <br /> is shown in Appendix D.) The sample will be placed in a water-tight <br /> plastic bag and at in a cooler containing ice. Once all the <br /> 2-3 <br />