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} IU 4 4.2 DRILLING AND SAMPLING OF CPT AND HYDROPUNCH BORINGS ETIC will oversee the drilling of four CPT borings to depths of approximately 100 feet BGS. The proposed locations of borings CPT -4, CPT -5, CPT -6, and CPT -7 are shown on Figure 10. CPT logging will be performed at each location to assess soil types and the location of various water -bearing zones;, One soil sample will be collected from CPT -4 at a depth of approximately 23 feet BGS and two soil samples will be collected from boring CPT -6 at depths of approximately 30 and 35 feet BGS for laboratory analyses. These analytical data from CPT - 4 and CPT -6 will assist in assessing the lateral extent of impacts in soil. The soil samples will' be collected in pre -cleaned liners. The liners will be sealed, labeled, stored on ice in a cooler, and transported to a state -certified analytical laboratory under chain -of -custody protocol. The soil samples will be analyzed for TPH-g, BTEX, five fuel oxygenates (MTBE, TBA, DIPE, ETBE, and TAME) and the fuel additive 1,2 -DCA by EPA Method 8260B. The soil samples , will be examined for lithologic identification and evidence of contamination. The observations will be recorded in the field log. Soil will be described in accordance with the Unified Soil Classification System. Technical guidance for the program will be provided by a California Professional Geologist. Groundwater samples will be collected between 50 and 100 feet BGS at depths determined during drilling based on hydrogeologic data obtained from the CPT borings. ETIC anticipates that groundwater samples will be collected at approximate 10 -foot depth intervals. .Hydropunch rods will be drilled immediately adjacent to each CPT location and groundwater samples will be collected by lowering disposable bailers through Hydropunch rods screened at the desired sampling depth. A groundwater sample will be collected just below the top of the encountered water bearing zone. `,Each groundwater sample will be collected from a separate Hydropunch�5 location, if possible. " S o c j ^�- ' 4� L -f -T Ln-,-, ti Groundwater samples will be placed in pre -cleaned laboratory supplied containers. The containers will be sealed, labeled, stored on ice in a cooler, and transported to a state -certified analytical laboratory under chain -of -custody protocol. Groundwater samples will be analyzed for TPH-g, BTEX, five fuel oxygenates (MTBE, TBA, DIPE, ETBE, and TAME) and the fuel , additive 1,2 -DCA by EPA Method 8260B. All reusable sampling equipment will be decontaminated between uses. Each CPT boring will be filled and sealed with a grout mixture consisting of neat cement, upon completing sampling, in accordance with SJCEHD and California Department of Water Resources requirements. 4.3 DISPOSAL OF INVESTIGATIVE -DERIVED WASTE Rinsate water derived from investigation activities will be contained in Department of Transportation (DOT) -approved drums stored temporarily at the Site. A water sample will be collected and submitted for laboratory analyses. The samples will be analyzed for TPH-g by EPA Method 826013, TPH-d and TPH-mo by EPA Method 8015M with a silica gel cleanup, SL AIR SCM and RI WP 14