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January 3. 1991 BALD& CHANG ASSOCIATES <br /> Fib No. 2037-1 <br /> is presented on Plate A-1. Field methods and techniques employed for soil and groundwater <br /> sampling and well installation are described in more detail in Appendix B. A summary of <br /> the monitoring well construction is presented in Table 1 below. <br /> TABLE 1 <br /> SUMMARY OF MONITORING WELL CONSTRUCTION <br /> Well Water Level Perforated Total Depth <br /> Number First Encountered Section of Well <br /> MW-1 11.5' 5' - 20' 20' <br /> IV. SUMMARY OF GEOLOGY, SOEL AND GROUNDWATER CONDITIONS <br /> The site is located at the northern third of the San Joaquin Valley in the Great Valley <br /> Geomorphic Province. The site is underlain by Pleistocene sedimentary and recent alluvial <br /> fan deposits. <br /> The surficial site soils are mainly dark brown to brown, clayey silt to silty clay. This <br /> silty/clayey stratum grades damp to moist, medium stiff to stiff, low plasticity, and extends <br /> to depths about 9 to 16 feet below the existing ground surface. A brown clayey sand to <br /> sandy clay underlies the surficial silty/clayey layer and stretches to the maximum explored <br /> depth of 20 feet. This sandy/clayey layer has characteristics of moist to wet, medium dense <br /> to medium stiff, and low to medium plasticity. Observation made during this investigation <br /> firmly support the literatures. The logs of test borings and monitoring well, which contain <br /> detailed descriptions of site soil strata and well construction, are presented in Appendix A. <br /> Groundwater was encountered in four test borings. The groundwater levels ranged from <br /> about 11.5 to 13 feet measured immediately after the drilling. One testing boring (TB-3) <br /> was converted to a groundwater monitoring well (MW-1) and a summary of the <br /> groundwater level survey is presented in the following Table 2. <br /> 1 Page 4 of 7 <br />