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' Former Nelson Ready Mix Page 8 <br /> Groundwater Monitoring Well Construction <br /> GPE Project No 518 2 <br /> March 30,2006 <br />' 3.0 FIELD & ANALYTIC DATA <br /> 3.1 Site Geology & Hydrology <br />' Site Geology <br /> The geologic character of sediments observed during the completion of the <br />' borings in the area can generally be characterized as yellowish brown clay and <br /> silt with minor amounts of sand The soils are fine-grained and poorly <br /> permeable Details are shown in the soil boring logs attached as Appendix B <br /> Hydrology <br />' Evaluation of the site's hydrologic conditions included a review of the County <br /> Flood Control and Water Conservation District's, Sprang 1999 Groundwater <br /> Report Based on the map information, the first groundwater lies about 15 to 20 <br />' feet below grade and flows in a northeasterly direction <br /> Data from the new monitoring wells show that locally, the depth to first <br /> groundwater is about 8 feet below grade Using the survey information (see <br /> Section 4 0) and groundwater monitoring data, a three-point calculation was <br /> made of the slope of the groundwater surface (see Figure 2) The calculation <br /> indicated that on February 17, 2006, the groundwater surface at this site was <br /> flowing on bearing of approximately S1411W with a gradient of 0 0040 ft/ft <br /> 3.2 Soil & Groundwater Analyses <br />' Soil <br /> Two soil samples from each boring were submitted to Argon Analytical Services <br /> Ceres (State Certified Laboratory #2359) following Chain of Custody protocol <br />' All samples were tested for the presence of benzene, toluene, ethylbenzene, and <br /> xylene (BTEX) using EPA method 8020 Total Petroleum Hydrocarbons <br /> measured as gasoline, were analyzed using EPA method 8015m The detection <br /> 1 limits for these analyses are shown in the laboratory data sheets in Appendix A, <br /> as well as in Text Table 2 below <br /> rGroundwater <br /> Groundwater samples were collected from each of the three groundwater <br />' monitoring wells on February 17, 2006 All samples were submitted to Argon <br /> Laboratories following Chain of Custody protocol and were tested for the <br /> presence of benzene, toluene, ethylbenzene, and xylene (BTEX) using EPA <br /> method 602, and Total Petroleum Hydrocarbon as gasoline (TPH-G) by EPA <br /> method 8015m and for the presence of five oxygenated compounds commonly <br /> used as gasoline additives (TBA, MTBE, DPE, ETBE & TAME) using EPA <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> I <br />