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Subsurface Investigation Report,Tosco(Former BP) Service StationNo 11192 { June 8,2001 3.3 Cone Penetrometer Test 1 S On April 25, 2001 a GR geologist observed Fisch Environmental Exploration Services utilize a truck mounted CPT rig to advance two borings in close proximity to each other (collectively referred to as CPT-1 at the location shown on Figure 2) The CPT rig was equipped with an onboard computer system that provided a real time analysis of the subsurface conditions The CPT device creates a lithologic log of the boring by comparing the CPT point resistance to sidewall friction on the device The log of CPT-1 is presented in Appendix B The first boring, collecting the lithologic data, was advanced to 57 feet bgs and terminated due to refusal A second boring was advanced approximately 15 feet west of the first for the purpose of collecting a depth discrete groundwater sample For the second boring, the CPT rig was fitted with a groundwater sampling tool The sample tool was advanced to approximately 75 feet bgs using hydraulic force and mechanical percussion not available for lithologic logging At the target depth, the sampling device retracts to expose a screen allowing groundwater to enter the device The groundwater sample was collected using clean plastic tubing fitted with a check valve and was submitted for chemical analysis as described in Section 3 6 3.4 Borehole Sealing After probing and sampling were completed, the boreholes were sealed with neat cement grout The grout was placed from the bottom of the boring to approximately one foot bgs with a tremie pipe The boreholes were finished to surface grade with quick-set concrete Mr Michael J Infuriia of the PHS-EHD was on-site and witnessed the grouting of Geoprobe B-4 3.5 Waste Disposal Drill cuttings were placed on and covered with plastic sheeting and stored onsite pending disposal One two part composite sample [Comp-1 (A,B)] was collected from the stockpile and submitted to the laboratory for analysis and disposal characterization The analytical results from the composite soil sample were submitted to Allied Waste's Forward landfill in Manteca Upon approval, the soil will be removed from the site and transported to the landfill by a California-licensed hazardous waste hauler 3.6 Laboratory Analysis Selected soil and all groundwater samples were submitted to Sequoia Analytical in Walnut Creek California (FLAP #1271) The samples were analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg) by Environmental Protection Agency (EPA) Method 8015, benzene, toluene, ethylbenzene, xylenes (BTEX) and methyl tertiary butyl ether (MTBE) by EPA Method 8020, ethanol, tert-butyl alcohol (TBA), MTBE, di-isopropyl ether (DIPE), ethyl tert-butyl ether(ETBE), 14024503-3 4