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September 24, 1999 <br /> .lob Number:599244 <br /> Page 5 <br /> VI. GEOLOGY, SOILS,AND PERCOLATION TEST <br /> The geology of the area is reported to be Pliocene age fanglomerate deposits consisting of <br /> conglomerate, sandstone, and siltstone.' These types of deposits are commonly unconsolidated <br /> and heterogeneous in nature. Below the fanglomerate deposits are older Cenozoic and Mesozoic <br /> deposits that commonly dip eastward into the San Joaquin Valley trough. Several surficial and <br /> buried thrust faults are located along the eastern boundary:of the Sacramento and San Joaquin <br /> Valleys. The most noteworthy is the Great Valley Fault(segment.no. 7) located about 1 rnile east <br /> that are thought to be a significant earthquake source and similar in geometry to the 1983. <br /> Coalinga earthquake blind thrust faults. <br /> The soils located on the site are reported to be the Rioblancho clay loam(Plate 3). The <br /> followm <br /> is an excet of the engineering properties for the following soul. <br /> g <br /> rp <br /> Selected Soil Properties from the Soil Survey of San Joaquin County, California' <br /> Soil Name Depth(in) Unified Soil Salinity Soil Reaction Septic tank <br /> and Map Classification mmhos/cm pH absorption fields <br /> Symbol <br /> Carbona 0-6: Clay loam I CL c4 7.4-8.4 <br /> clay loam, 6-25: Clay loam, CL, CH <4 7.4-8.4 <br /> 1123 clay <br /> 25-36: Clay loam, CL, CH <4 7.9-8.4 <br /> clay <br /> I 36-62: Clay loam CL <4 7.9-8.4 Severe:peres <br /> sIowl . <br /> Note: The table descriptions do not necessarily rcflect site-specific soil properties_ <br /> Soil boring(B-1) was excavated to a depth of 40-feet to characterize the soil profile of the <br /> site and determine the depth to ground water (Plate 4 and Plate 5)_ No ground water was <br /> encountered to a total depth of 40 feet. A sante section with good percolation potential-was <br /> ' Wagner,D.L..Bortugno,E.1,and Mchinkin,RD., 1990,Geologic Map of the Sari Jose Quadrangle, <br /> California. California Division of Mines and Geology,Regional Map Series Map No. 5a. Scale 1:250,000, <br /> 2 USDA Soil Conscrvation Service, Soil Survey of San Joaquin County,California, sheet 8. <br /> a .n <br /> Y � <br /> fTSOG� <br /> i <br />