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.3 Work Plan-Soil and Groundwater Investigation Gateway Pmject,City of Stockton L Mash 10,2000 Page-3- rLaboratory testing of eight soil samples and four groundwater sample&have been assumed in the project, work plan. Soil sample analytical,data supplein ted with groundwater sample analytical data should be sufficient for preliminary evaluation.of the potential for a groundwater impact and PIER preparation. The Geoprobe borings will be hydraulically advanced using a 2-inch diameter.conical'bit. The bit and associated push rods;iwill be thoroughly cieanedbefore each borehole is drilled using laboratory-grade, _ non-phosphate detergent and deionized water and double rinsing with deionized water. Upon Completion.- of the drilling and sampling;the boreholes wilt be' 'grouted with a grout slurry containing 3 to5-percent bentonite. The slurs will be tremied into the borehole to avoid bridging. 33 SOIL SAMPLING - Soil samples will be collected from each boring with a 1.75-inch O.D.; 4-foot long, core barrel, fitted with a clean, one time use, polyethylene liner. !The soil sampling equipment will be:cleaned prior to collecting each sample. The,cleaning.procea4es will.consist of washing the sampling spoon in a solution of iaboratoiy-grade, non-phosphate detergent and deionized=water, and double-rinsing with _ hydrocarbon-free water. J - During the sampling,the core barrel will be driven in 4-foot intervals. The sample liner will be extracted 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 l field observations including soiltype, estimated moisture content;-PID measurements, and the presence IK of staining or odor. Each soil.sample will;be cut from the liner at.the selected depth for potential laboratory analyses. The soil samples will be 'retained, undisturbed,-in°the liners: The liners will be scaled at the ends. with Teflon® sheeting, capped, wrapped with duct tape, and labeled." The samples will be stored.in'a cooler chilled with ice and;delivered wfthin 24�houis of collection,.- chain-of-custod procedures, to ._ y A , GeoAnalyt cal:Laboratories, Inc,of Modesto California'- -The sairiples will be-analyzed using U S-.:EPA Methods and California-approved methods urider,strict quality assurance-measures'. =CONDOR- ..--