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ARCADIS Site Investigation Work Plan 401 North San Jose Street,Stockton,Caifornla $.3 Hydroptmch Groundwater Sampling One groundwater sample will be taken at each CPT location. A CPT rig will be used to advance the hollow push rods to the bottom of the boring. The push rods will then be retracted,exposing an encased filter screen and allowing groundwater to infiltrate hydrostatically from the formation Into the inlet screen.A small diameter bailerwill be lowered through the push rods Into the screen section for sample collection. Once the bailer Is filled,the bailer will'be retrieved and the groundwater will be'transferred Into the appropriate laboratory-supplied sample containers. Upon completion of the sample collection,the equipment will be .retrieved to the ground surface and decontaminated.The borehole will be brought to grade with neat cement grout. The groundwater samples will be analyzed for the following constituents: • TPH-GRO,TPH-DRO,TPH-mo by USEPA Method 8016 Modified • Benzene, toluene,ethylebenzene-and total xylenes(BTEX),MTBE, 1,2-dichlaroethane(1,2-DCA), ethanol,diisopropyl ether(DIPS), ethyl tert-buytl ether(ETBE),tent-amyl methyl ether(TAME), t-buyll alcohol(TBA)and 1,2-dibromoethene(EDB)by USEPA Method 8260B Groundwater samples will be sealed,labeled,and pieced In an Ice-filled cooler and shipped under appropriate chain-of-custody protocols to Lancaster Laboratories, Inc. In Lancaster, Pennsylvania. 3.4 Soil Sampling In addition,two soil samples will be obtained at each CPT location,at nominal depths of 0--1 feet below ground surface(ft bgs)and 2-3 ft bgs.The samples will be collected using a hand auger.and slide hammer with stainless steel sample sleeves. . The core will be logged by a geologist and screened using a photo- Ionization detector(PID). The soil samples will be analyzed for the following constituents: • CAM 17 metals by EPA 6010B • TPH-GRO,TPH-DRO, and TPH-mo by USEPA Method 8015 Modified • BTEX,MTBE, 1,2-DCA,ethanol, DIPE,EfBE,TAME,TBA and EDB by USEPA Method 82608 Upon completion of the soil borings,the boreholes will be brought to grade with neat cement grout. 5