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Mr Charles Carmel Page 2 of 2 <br /> June 30, 1993 <br /> iThe contents of the remaining liners from each California Sampler and the auger cuttings were <br /> examined by the field geologist. Soils from the samplers were described using the Unified Soil <br /> Classification System. The field geologist also noted moisture content and any evidence of <br /> petroleum hydrocarbons (i e. soil staining and odor). Geologic logs for each borehole were <br /> prepared under the direction of a California Registered Geologist and are included in the <br /> Attachments <br /> Selected soil samples from each borehole were analyzed by Sequoia Analytical, a California <br /> Department of Health Services (DHS) certified laboratory, for total purgeable petroleum <br /> hydrocarbons (TPH-G) by U.S. Environmental Protection Agency (USEPA) Method 8015 and <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX) by USEPA Method 8020. Results of the <br /> laboratory analyses are summarized on Table 1. Laboratory analytical reports and <br /> Chain-of-Custody forms are included in the Attachments <br /> The boreholes were backfilled with cement-bentonite grout to grade <br /> Summary of Results <br /> Soil encountered in the boreholes drilled during this investigation consisted of clay and silt with <br /> interbedded sand layers Ground water was not encountered <br /> • Laboratory analysis of the soil samples showed that petroleum hydrocarbons were present at very <br /> low concentrations in both boreholes. Concentrations of TPH-G in soil ranged from not detected <br /> to 1.2 mg/kg Concentrations of BTEX ranged from not detected to 0.13 mg/kg. <br /> It is our understanding that ARCO plans to install the new USTs into the same area of the Site <br /> as the existing USTs. The new USTs will not be installed north of the pump island where soil <br /> bonngs B 1 and B2 were drilled <br /> Respectfully submitted, <br /> ROUX ASSOCIATES <br /> Paul Supple Todd Ramsden, R G. <br /> Senior Hydrogeologist California Registered Geologist No. 5687 <br /> TR ch <br /> Attachments <br /> Figure 1 Site Location <br /> Figure 2 Site Plan <br /> Table 1 Summary of Soil Sample Analyses <br /> • Soil Boring Logs <br /> Laboratory Reports <br /> Chain-of-Custody Documentation <br /> F+oanc assocw�s <br /> Doc #A158W01 1.6 <br />