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h4 KLEINFELDER G2, G3 and G4, respectively. One of these probes (GI) was advanced to assess groundwater condition beneath petroleum impacted soil within the footprint area northeast of the rupture point. Twenty six pushprobes (PP1 through PP25) and Gl noted above were also advanced in the �1 footprint area. Approximately 19 of the 26 probes advanced in the footprint area were located �l based on a general 75-foot grid pattern (see Plate 2). An additional seven of the remaining 26 probes were advanced in the assumed greatest petroleum impacted areas, located east and northeast of the rupture site. The 25 shallow probes (PP1 through PP25) were advanced to total depths ranging from approximately 8 to 24 feet bgs. The deeper pushprobes Gl through G4 were advanced to total depths ranging from 44 to 58 feet bgs. Groundwater was noted approximately 43 feet bgs in these four deeper probes. Four point composite and/or discrete soil samples were collected from each pushprobe location. Twenty-two 4-point composite samples were collected for the purpose of providing data.for profiling the soil for disposal purposes and to assist in assessing the limits of petroleum impacted soil. Four-point composite samples were collected primarily in obvious petroleum impacted depth intervals from a single boring. However due to relatively shallow contaminant areas, a few of the composite samples were collected from two probes. Discrete soil samples were collected to assess both the vertical and lateral extent of petroleum impacted soil. Discrete soil samples collected within the footprint area were usually near the total depths of various probes beneath obvious petroleum impacted zones, to assess the vertical limits of petroleum impacted soil. Some discrete samples were also collected in contaminant interval at varying depths to assess petroleum concentrations changes with depths and for correlation with field observations. Discrete samples were also collected from perimeter probes i to assess the lateral migration of petroleum constituents outside the footprint area. The push probe borings were pneumatically advanced using a 4 foot steel core barrel. Soil samples were continuously collected and logged by inserting a new four foot acetate liner into the probe prior to each drive. Soil samples obtained for potential chemical analyses were collected at desired intervals by removing the acetate liner and cutting out the desired 6-inch interval. The soil samples were sealed with Teflon film and plastic end caps. Samples submitted for analysis were collected at depths ranging from 1 to 43 feet bgs. During the advancement of the push probes, Kleinfelder collected soil samples for logging purposes, field screening and potential chemical analysis. The soil samples collected were field screened using a photo-ionization detector as described in Appendix A, Section A-2.2. Photo- ionization detector (PID) readings were recorded on the boring logs and ranged from 0 parts per million by volume (ppmv) to 950 ppmv. The highest PID readings, soil discoloration and strong petroleum odors were noted primarily north of the Chevron pipeline and to a lesser extent y : southwest of the rupture point and pipeline. PID reading in these areas typically ranged from 500 to 900 ppmv in soils from surface to depths ranging from 5 to 10 feet bgs. PID readings in most of �} 44843.T03/ST04R1025 Page 7 of 16 Copyright 2004 Kleinfelder,Inc. August 6,2004