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Rcport-Soil and Groundwater investigation Canepa s Car Wash 6720 Pacific St Stockton LA ' lune 12 Pagea 3- 3- were logged according to the Unified Soil Classification System Drilling logs were prepared and ' include field observations such as estimated moisture content, color, and odor Selected soil samples from each borehole, based on depth, field observations, and OVA-PID measurements, were sent to the laboratory for chemical analysis Each sample was retained, undisturbed, in the brass tube, scaled at the ends with Teflon tape, capped, wrapped with duct tape, and labeled The samples were stored in a cooler chilled with Blue Ice and delivered within 24 hours of collection, under I chain-of-custody procedures, to GeoAnalytical Laboratories, in Modesto, California (a California State Certified laboratory) The soil samples were analyzed using U S EPA Methods and California-approved methods following quality assurance measures Laboratory analyses are discussed in Section 3 5 I3 4 SIMULPROBE SAMPLING The 5 foot long split spoon sampler was used to investigate the lithologic profile of the site to a total ' depth of approximately 70 feet bgs The vertical distribution of soil gas contaminants within the vadose zone was investigated by using a Simulprobe sampling device The Simulprobe sampling device was deployed in place of the split-spoon sampler to collect soil gas screening samples Once the borehole ' was drilled to the planned depth, the Simulprobe sampler was hammered into the formation to retrieve a soil gas screening sample The Simulprobe has an integrated soil gas sampling system that, through a filter screen, will allow soil gas to enter the sampler The soil gas was routed through the sampler and to the surface using Teflon tubing connected to a small pump An OVA-PID was used to make measurements of the volatile organic compounds in the soil gas A discussion of the findings is ■� presented in Section 4 0 The vertical distributions of contaminants within the saturated zone were also investigated using a Simulprobe sampling device The Stinulprobe sampling device was deployed in place of the split-spoon sampler to collect soil and groundwater samples in the saturated zone The sampler was cleaned before Icollecting each sample using the procedure described in Section 3 3 above Once the borehole has been drilled to the planned depth, the Simulprobe sampler is hammered into the formation to retrieve a soil and groundwater sample The Simulprobe also has an integrated groundwater sampling system that, through a filter screen, allows groundwater to enter the sampler at the depth from which the soil sample is collected The sampler is raised to the surface on drill stem, disassembled, and the soil and groundwater samples removed Each groundwater sample is gravity drained from the device into the sample containers Samples were handled in accordance with the standard procedures described above in Section 3 3 of this report ' 3.5 LABORAIOHY ANALYSIS The soil samples collected from the borings were analyzed for TPH-G by Method 5030/LUFT, for Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) EPA Method 8020, and for gasoline oxygenates/additives by EPA Method 8260 The gasoline oxygenates/additives include Methyl tertiary- Butyl Ether (MTBE), Ethanol, tertiary-Butanol, Di-isopropyl ether (DIPS), Ethyl tertiary-Butyl Ether (ETBE), and tertiary-amyl Methyl Ether (TAME) The groundwater samples were analyzed for TPH-G by Method 5030/LUFT, for B 1 EX by EPA Method 602, and for gasoline oxygenates/additives by EPA Method 8260 4M Ntio", It� CONDOR