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3.3 Logging <br /> Auger returns and soil from the middle brass tube were monitored <br /> for the presence of organic vapors using a photo-ionization <br /> detector (PID: Thermo Environmental 580A, 10. 0 eV, calibrated to <br /> isobutylene) . The soil was then described in accordance with the <br /> Unified Soil Classification System. Boring logs are included in <br /> Appendix C. <br /> 3.4 Laboratory Analysis <br /> A total of 8 soil samples from borings #1 through #4 were analyzed <br /> for total petroleum hydrocarbons (TPH as gasoline and diesel) and <br /> purgeable aromatics (BTE&X) in accordance with EPA methods 8015 <br /> modified and 8020, respectively. One of these samples from boring <br /> #3 was also analyzed for total lead in accordance with EPA method <br /> 7421. <br /> Two samples from boring #5 were analyzed for TPH as diesel and <br /> BTE&X, and two samples from boring #6 (waste oil tank) were <br /> analyzed for total recoverable petroleum hydrocarbons (TRPH) in <br /> accordance with EPA method 418 . 1. This method provides an <br /> inexpensive way of detecting the heavy molecular weight <br /> hydrocarbons characteristic of oil and grease. <br /> 3.5 Water Sample Collection and Analysis <br /> 1 On May 13 , 1993 , a water sample was collected from the domestic <br /> well located on the southwestern portion of the property. The <br /> sample was collected in 40 ml EPA vials and 1-Liter amber bottles, <br /> and stored on ice pending transmission to West Laboratories in <br /> Davis. The sample was analyzed for total petroleum hydrocarbons <br /> (TPH as gasoline, diesel, and motor oil) , BTE&X and Volatile <br /> Organic Priority Pollutants in accordance with EPA methods 8015m, <br /> 602 and 624 respectively. <br /> 4. 0 FINDINGS <br /> 4.1 stratigraphy <br /> The borings penetrated mostly brown to orange-brown clayey silt. <br /> This sediment is slightly oxidized and mottled in color. A <br /> relatively thin bed of silty, fine-grained sand is present beneath <br /> the UST's at a depth of approximately 25 feet, and a second thin <br /> sand layer was penetrated at a depth of 16 feet in boring #1. <br /> No oil staining or discoloration was observed in any soil samples <br /> or auger returns. Slight hydrocarbon odors were noted in samples <br /> from a depth of five feet in borings #2 and #5, but concentrations <br /> of only 1 and 5 ppm, respectively, were detected by the PID in <br /> these samples. Sample B6-5 emitted an odor of decomposed organic <br /> 3 <br />