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l Work Plan-Soil and Groundwater Investigation <br /> CSUS—Multi-Campus Regional Center <br /> June 21,2000 <br /> Page-3- <br /> collected at five-foot intervals. Two soil samples from each of the five borings will be selected for <br /> laboratory analyses based on field observations and field screening with a photoionization detector <br /> (PID). <br /> Laboratory testing of ten soil samples and five groundwater samples have been assumed in this project <br /> i <br /> i work plan. Soil sample analytical data supplemented with groundwater sample analytical data should be <br /> sufficient for preliminary evaluation of the potential for a groundwater impact and preparation of a <br /> Preliminary Investigation and Evaluation Report (PIER) as described by the Appendix A of the Tri- <br /> Regional Board Staff Recommendations for Preliminary Evaluation. and Investigation of Underground <br /> Tank Sites. <br /> I <br /> The direct push borings will be hydraulically advanced using a 2-inch diameter conical bit. The bit and <br /> associated push rods will be thoroughly cleaned before each boring is drilled using Iaboratory-grade, <br /> non-phosphate detergent and de-ionized water and double rinsed with de-ionized water. Upon <br /> completion of the drilling and sampling, the borings will be grouted with a grout slurry containing 3 to 5 <br /> percent bentonite. The slurry will be trenoied into the borehole to avoid bridging. <br /> 33 SOEL SAMPLING <br /> Soil samples will be collected from each boring with a 1.75-inch O.D., 4-foot long, core barrel,.fitted <br /> with a clean, single use, polyethylene liner. The soil sampling equipment will be cleaned prior to <br /> collecting each sample. The cleaning procedures will consist of washing the sampling spoon in a <br /> solution of laboratory-grade, non-phosphate detergent and deionized water, and double-rinsing with de- <br /> ionized water. <br /> { <br /> During the sampling, the core barrel will be driven in 4-foot intervals. The sample liner will be extracted <br /> 'from the core barrel and used for geological logging and field observations. The soil samples will be <br /> logged according to the Unified Soil Classification System. Geological logs will be prepared containing <br /> { field observations including soil type, estimated moisture content, PID measurements, and the presence <br /> +I of staining or odor. <br /> �� ' CONDOR <br />