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I At each location, a pair of borings.►i l be iadvanced with the CPT rig. The first boring at each location, will be used to record tip resistance, sleeve friction and pore water pressure at five- centimeter centimeter intervals. These data Will b'e:�;processed and interpreted in the field. Based on the a interpreted soil and groundwater parameters, the second soil boring at each location will be rillz advanced to specific depths for discrete groundwater sample collection. From the proposed CPT boring at CPT4groundwater samples will be collected from the sand 'I and gravel interval at approximately',126 feet, and from any deeper groundwater-bearing i intervals identified. From the other five CPT locations, all significant groundwater-bearing intervals will be sampled. All of the groundwater samples will be collected with a Hydropunch®. After deployment of the HydropuncH at each sample depth, it will be checked for leakage, prior to exposing the sampling screen. All groundwater samples will be collected into laboratory-supplied containers. The containers will be labeled, packaged in an iced cooler and transported for analysis with chain-of-custody f documentation to a state of California{celrtified hazardous waste testing laboratory. Each groundwater sample will be analyzed on A standard turn-around for TPH-as-gasoline, benzene, toluene, ethylbenzene, xylenes (BTEX), MTBE, di-isopropyl ether(DIPS), ethyl tertiary butyl ether ETBE , tertiary amyl methyl ether TAME , tertia butanol (TBA), 1,2-DCA and 1 2- { ) rY Y Y 1 ; ;! (TIAME), rY ( ) uE, t dibromoethane (EDB) by EPA Method 8260B. Given that the extent of impacted soil has been defined, no additional soil samples will be collected for laboratory analysis.' Immediately following the drilling of each soil boring, the CPT borings will be sealed with bentonite�g'rout. The grout will be placed to the bottom of the boreholes using a tremie pipe or grouticollar. 2.3 Installation of Groundwater Monitoring Well Cluster A, To establish a groundwater monitoring capability downgradient of the known plume of impacted groundwater, a cluster of two groundwater monitoring wells will be installed north of the existing monitoring well network (Figure'2):',The.shallow monitoring well will be constructed as a ;a '. fI . E groundwater table well, and the deep monitoring welLwill be constructed in the next deeper f groundwater-bearing zone. 7 F