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MIN <br /> 4.0 HYDROGEOLOGY <br /> The site is locate(!within the central portion of the physiographic providence known as the Great <br /> Valley. The Great Valley is a large elongate northwest-trending asymmetric structural trough <br /> that has been filled with a thick sequence of sediments ranging in age:iorr.Jurassic to Recent. <br /> In the study area these sediments consist of a heterogeneous sequence of gravel, sand, silt, and <br /> clay deposited by the Sacramento River system. The sediments encountered during drilling <br /> ' consist primarily of ar• organic soil to approximately 5 feet below grade underlain with peat to <br /> -` 12 feet. The soil beneath the peat consists of a fat clay to total depth of 16 feet below grade. <br /> Lithologic logs are presented in Appendix 1. <br /> he deposits containing fresh groundwater in the area are principally unconsolidated continental <br /> deposits of Pliocene to Recent age that extend to depths ranging from I.a3 than ten to more than <br /> 3,500 feet. Groundwater was encountered during drilling activities at approximately 1.5 feet <br /> below grade. <br /> 5.0 FIELD INVESTIGATION <br /> To provide additional information regarding subsurface conditions at the site, RESNA <br /> IndustrieslWaterWoir Corp. supervised the drilling of 5 groundwater monitoringwells during <br /> the months of March and .April 1991. The drilling was performed by ExcelTech Drilling of <br /> y <br /> Fremont,California, utilizing,a hoIIow-stem auger drill rig. The wells were situated to provide. <br /> information regarding groundwater quality and hydraulic conditions beneath the site(Figure 5). <br /> A. <br /> 5.1 Samoling Procedures <br /> All borings were sampled at approximately 1.0 to 2.5 feet below grade using a split-spoon <br /> " sampler with brass liners. The brass liners were sealed at each end with aluminum foil and a <br /> plastic cap. The plastic cap was secured with tape and the sample placed on ice. The soil was <br /> logged by a qualified geologist using the Unified Soil Classification System. Descriptions of'rhe <br /> soils encountered and monitoring well details were recorded on the well/boring logs (Appendix <br /> 'I King!Mand Resort-367 <br /> Rc�7591.wp 3 <br /> N. <br /> I <br />