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k'q KLEINFELDER <br /> 3. EXCAVATION AND ASSESSMENT ACTIVITIES <br /> Field sampling and data review were conducted under the supervision of a registered geologist <br /> and engineer Soil samples were collected by an experience environmental geologist Samples <br /> were collected and handled according to Kleinfelder's Field Protocol included in Appendix A <br /> 3 1 SOIL EXCAVATION SERVICES <br /> Excavation services were provided by Lutrel Trucking Inc of Bakersfield, California Lutrel <br /> was selected and retained by Independent Trucking Company Soil excavation was conducted on <br /> August 21, 22 and 23 The area beneath the removed tanks was excavated to a depth of 3 5 feet <br /> The middle section of the area was then further excavated to a depth of 9 5 feet, and the northern <br /> Portion of the area was further excavated to a depth of 21 feet <br /> Approximately 900 cubic yards of soil were additionally excavated from the aboveground <br /> storage tank area during this time Groundwater was not encountered in the excavation at a depth <br /> of 21 feet, however, nearby well sampling conducted in December 1995 indicated that water was <br /> present 23 to 24 feet below the ground surface The locations of the removed tanks and <br /> excavation areas are shown on Plate 2 <br /> 3 2 ORGANIC VAPOR SCREENING AND CONFIRMATION SAMPLING <br /> The excavation activities were observed by an experienced environmental geologist The <br /> geologist classified the soil and collected soil samples for analysis To provide a qualitative <br /> indication of petroleum hydrocarbons in the soil and to monitor the vapor concentrations in the <br /> breathing zone of the field crew, a portable organic vapor analyzer (OVA) equipped with a <br /> photoionization detector (PID) was used to screen the samples in the field The OVA measures <br /> total ionizable compounds in parts per million by volume (ppmv) relative to a calibration <br /> standard <br /> OVA readings in the excavation sidewalls (6 to 7 feet) ranged from 150 to 225pP my The <br /> highest OVA readings were observed in the northwest portion of the excavation area, therefore <br /> the excavation was extended to a depth of 21 feet in this area OVA readings were not observed <br /> in the breathing zone <br /> 23-482276-BOO/CR96S276 Page 4 of 1 1 October 17, 1996 <br /> Copyright 1996 Kleinfelder,Inc <br />