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i7 <br /> • • II <br /> 1 � <br /> . SIERRA <br /> Clint Rogers Page 3 <br /> October 30, 1991 <br /> SES Project #1-146-01 <br /> supplemented with water from the Calaveras River through the Stockton-East Water District <br /> Aqueduct (page 44) <br /> The site is located in the Great Valley geomorphic province which is a north-west trending <br /> asymmetric structural trough The basin is crossed by two mayor faults the Stockton fault which <br /> separates the Sacramento and the San Joaquin sub-basins and the White Wolf fault m the <br /> southern part of the basin The site is underlain by Cenozoic non-marine alluvial deposits which <br /> consist of interbedded sand, silt and clay 4 The ground water level at the site was recorded at <br /> approximately 45 feet below grade in February 1987 ,5 The depth to ground water In August 1991 <br /> is approximately 55 to 56 feet below grade The ground water gradient beneath the site is nearly <br /> flat (approximately 0 001 ft/ft) and is easterly (Figure 2, Appendix A) <br /> The closest surface water is Fivemile Creek, approximately one-half mile to the northwest <br /> SCOPE OF WORK <br /> 1 Research the site history and prepare a site safety plan specific to this investigation <br /> 2 Abandon one previously existing monitoring well <br /> 3 Drill one soil boring for hydrogeologic description and for possible chemical analysis The <br /> soil samples from the boring will be surveyed in the field with an organic vapor analyzer <br /> (OVM) to determine whether volatile hydrocarbons are present in the samples OVM <br /> readings and field observations will be used to select soil samples for analysis The soil <br /> samples will be analyzed for TPPH(G), and benzene, toluene, ethylbenzene and xylenes <br /> (BTEX) Selected soil samples will also be analyzed for total lead One soil cuttings sample <br /> will be analyzed for organic lead in accordance with Class III landfill disposal <br /> requirements <br /> 4 Geology of Northern California, 1966, California Division of Mines and Geology Bulletin 190, Geologic Map of <br /> California, Plate 1 <br /> !I 5 Groundwater Technology, 1987 Consultants report prepared for Chevron, February 27 1987 8 pp and 3 <br /> appendices <br />