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JT' <br /> Problem Assessment Deport December 5, 1489 <br /> USA Petroleum Station No. 65, Lodi, California ACS 87050-3 <br /> f <br /> 4 <br /> operated by Spectrum Drilling of Stockton, California. 'I'lie drilling was performed under <br /> the guidance of file field geologist and the earth materials in the boring were logged as <br /> drilled. <br /> Soil samples were collected at 5-foot intervals using a California-modified, split-spoon <br /> sampler equipped with clean brass sleeves.. Soil samples were collected by advancing the <br /> boring to a point immediately above the sampling depth, then driving the sampler into the <br /> native soil through the hollow center of the auger. The sampler was driven 18 inches with <br /> a standard 140-pound hammer dropped 30 inches. The number of blows required to drive <br /> the sampler each successive 6-inch interval was counted and recorded to give an indication - <br /> of soil consistency.Soil samples were classified according to the Unified Soil Classification <br /> I System (Plate P-4). Descriptions of earth materials encountered in borings B-4 through B- i <br /> - 7 are summarized on the Logs of Borings{Plates P-5 through P-14). Discussion of the soil <br /> I , . <br /> i <br /> stratigraphy is discussed after Laboratory Analyses. <br /> During sampling, a photoionization detector(PID) was used to characterize the relative <br /> levels of hydrocarbon contamination. Field instruments such as the IM can measure <br /> relative concentrations of vapor but not with the level of confidence of laboratory analyses. <br /> Contaminant levels-detected-in thismannerwere recorded in the field, and"subsequently <br /> f b ' used as a basis for selecting soil samples for chemical analysis. A PID reading for each . <br /> sample is shown on the Logs of Borings. <br /> 3 t 1? <br /> r APP)ed GeoSystems <br /> . -- •= i.,.:.,f IBJ i^ - ''. ... - .,.. - <br />