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Work Plan-Soil and Groundwater Investigation CSUS—Multi-Campus Regional Center ' lune 21;2000 Page-3- collected at five-foot intervals.::Two soil samples from each of the five -borings will be selected for - laboratory analyses based on field observations and- field screening with a photoionization detector (PID). Laboratory testing of ten soil samples and five groundwater samples have..been.assumed in this project work plan. Soil sample analytical data supplemented with groundwater sample analytical data should be sufficient for preliminary evaluation of the potential for a groundwater,impact and preparation of a Preliminary Investigation and Evaluation Report (PIER) as described by the Appendix A of the Tri- Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground rTank Sites. The direct push borings will be hydraulically advanced using.a-2-inch diameter conical bit. The bit and associated push rods will be thoroughly cleaned before each boring is drilled using laboratory-grade, non-phosphate detergent and de-ionized_. water and double rinsed with de-ionized water. Upon. completion of the drilling and sampling, the borings will be grouted with.a-grout slurry containing 3 to 5 - r' percent bentonite. The slurry will be tremied into the borehole to avoid bridging. 3.3 SOIL SAMPLING r Soil samples will be collected from each boring with a 1.75-inch O.D., 4-foot long, core barrel, fitted with a clean, single use, polyethylene liner. The soil sampling equipment will be cleaned prior to rrcollecting each sample. The cleaning procedures will consist of washing the sampling spoon in a solution of laboratory-grade, non-phosphate detergent and deionized water, and double-rinsing with de- ionized water. During the sampling, the core barrel will be driven in 4-foot intervals. The sample liner will be extracted i from the core barrel and used for geological logging and field observations. The soil samples will-be logged according to the Unified Soil Classification System. Geological logs will be prepared containing �+ field observations including soile, estimated moisture content PID measurements h� � , and the Presence of staining or odor. i Ls �J CONDOR