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Geosyntec'% <br /> con§ultants <br /> 7.2.1 Cone Penetrometer Testing(CPT) <br /> As shown on Figure 7, up to 8 CPTorings will be:advanced off-site and to the north <br /> of the CPT-13 area;and one CPT boriIg (CPT-2013-13D) will'be advanced adjacent to. <br /> CPT=MIP-2012-13. . The purpose of the GPT. investigation is to (i) provide detailed <br /> information.of the.geology iri'the apparent downgradient direction,of the CPT-13 area, . <br /> and (ii) to identify appropriate depth.:intervals for sampling.groundwater for analysis of <br /> toluene: <br /> Gregg Drilling' & .Testing, 1nc.`'of Martinez,.California, (Gregg)_. will provide the <br /> equipment and personnel to perform'the. CPT work. All.work will be completed under <br /> supervision.of Geosyntecc.personnel:-:The CPT.probe will be advanced to:a minimum <br /> • X .- <br /> target depth of 40 .ft bgs off-site and 60 xat location CPT-2013-13D (Figure 7). The <br /> following parameters:will be measured or:detected at.5 cm (0.16M depth intervals at <br /> each CPT location: <br /> 4 F flip resistance..{Qt); x ; <br /> • Sleeve friction(Fs);and <br /> Dynamic pore pressure(Ut). <br /> Soil behavior type '(SBT) .will be ;interpreted using .relationships between' these- <br /> parameters. The SBT log from each location will be evaluated and-used-to select up to <br /> two groundwater sampling depth interval(s). <br /> 7.2.2Groundwater Sampling,= • <br /> Up to tvo groundwater samples will lie collectedfromborings. •immediately adjacent to , <br /> each CPT location. Samples will be collected by advancing hollow CPT rods equipped <br /> with a disposable tip.and-filter. screen -to the'desired sample 'depth interval and then . <br /> retracting the rods approximately 2 to 4 feetto expose the:sereen. Samples will be. <br /> collected using a stainless-steel.bailer.- All sampling.equipment will,be decontaminated <br /> before sampling at each location. <br /> Groundwater samples will be collected:into laboratory-supplied sample containers and <br /> labeled with project identification, saniple•location�analytical parameters,time and date <br /> of sampling, and sample preservative, if.any. Groundwater samples will be stored in an <br /> ice-cooled chest, maintained at.approYtimately 4°C, for transport.under standard chain- <br /> CPT-13 <br /> hain-CPT-13 Area Investigation Report and Work Plan 22 30 May 2013 <br />