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Ripona Market <br /> Vertical Groundwater Investigation H Report <br /> Page 8 <br /> were taken at intervals of not more than 5 feet in order to evaluate the subsurface <br /> materials <br />' For augured borings the soil samples were taken using a California Modified Split <br /> Spoon sampler with brass liners or with the use of a Simulprobe A 140-pound <br /> hammer repeatedly falling 30 inches drove the sampler The blow counts <br />' necessary to drive the sampler were recorded for each 6-inch interval to help <br /> evaluate the consistencies of the materials <br />' The laboratory samples did not have headspace and were immediately sealed in <br /> their liners using aluminum foil lined plastic caps The remaining sample was <br /> removed from its liner to be used as an aide to the on-site geologist in logging the <br />' material at that depth <br /> All soil samples were delivered, under chain of custody, to GeoAnalytical <br /> Laboratories, an analytical laboratory licensed by the State of California for <br />' hazardous materials work The samples were analyzed for Total Petroleum <br /> Hydrocarbons (gasoline), BTX&E (Benzene, Toluene, Xylene, and Ethyl <br /> Benzene) and MTBE by method 802113 with confirmation by method 8260 <br /> 2.3 Groundwater Sampling <br /> P g <br /> Groundwater samples were analyzed or extracted within 14 days according to <br /> EPA methods and analyzed for Total Petroleum Hydrocarbons (gasoline), <br /> BTX&E (Benzene, Toluene, Xylene, and Ethyl Benzene) and the Oxygenated <br />' Compounds by Method 8260 GeoAnalytical Laboratories, Inc in Modesto, <br /> California conducted the analyses <br /> 3.0 SITE CONDITIONS <br />' 3.1 Site Geology & Groundwater Occurrence <br /> The site is underlain by interbedded fine to medium grained distal facies sediments <br /> of the Pleistocene Modesto Formation The Modesto Formation in the Ripon area <br /> was deposited in the distal portion of coalescing alluvial fans derived from the <br /> Sierra Nevada Mountains to the east In the distal portions of the fans, sandy <br /> sediments mterfinger with silts and clays deposited at the interface of the lacustrine <br /> environment, which was found in the center of the San Joaquin Basin The upper <br /> unit at the site, which is described below, represents a basmward transgression of <br /> the coarser grained alluvial fan sediments over the underlying finer grained <br /> lacustrine sediments A generalized hydrogeologic cross section is shown in figure <br />