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l <br /> CAMBRIA <br /> All of the soil samples did not contained detectable levels of benzene, toluene, or fuel <br /> oxygenates. Nine of the 14 soil samples did not contain detectable levels of TPHg, BTEX, <br /> and fuel oxygenates. Three of the soil samples contained only xylenes at concentrations <br /> ranging from 0.0159 to 0.0296 parts per million (ppm). The remaining two soil samples <br /> contained TPHg at concentrations of 4.59 and 54.7 ppm. Ethylbenzene and xylenes were <br /> also detected in these samples at concentratio s ranging from 0.138 to 1.55 ppm. A <br /> summary table of these analytical data is presented as Table 1 and the soil sample locations <br /> are shown on Figure 2. <br /> WORK PLAN <br /> Technical Rationale for Proposed Scope of Work <br /> • Residual hydrocarbons were detected in 3oil samples collected during tank removal <br /> activities in April 1999. TPHg was detec ed in two sample locations (TS-D and P-4) <br /> at concentrations of 4.59 and 54.7 ppm, respectively. The vertical extent of <br /> petroleum hydrocarbons at these two sam le locations is unknown. <br /> • Three soil samples (TS-E, TS-F, and DS 3) contained low levels of xylenes that do <br /> not warrant further investigation. Xylenes represent the least mobile portion of fuel <br /> hydrocarbons and therefore do not typically migrate far from the source area. This <br /> combined with the fact that the concentrations are so low suggests that further <br /> delineation in the area of these three soil amples is not necessary. <br /> • The lateral extent of petroleum hydrocarbons at TS-D and P-4 has been <br /> demonstrated by nearby soil samples collected at similar depths. Samples TS-B, TS- <br /> C, TS-E, and TS-F did not contain TPHg, benzene, or fuel oxygenates and were all <br /> collected at similar depths to TS-D. <br /> • The depth to groundwater is not known at this site, but based on information from <br /> other nearby sites we suspect groundwater is 20 to 30 feet below grade. <br /> • Cambria proposes two soil borings at the locations of TS-4 and P-4 to assess the <br /> vertical extent of petroleum hydrocarbons in soil beneath the site. Two additional <br /> borings are proposed approximately 15 feet away from the first set of borings to <br /> assess the lateral extent of petroleum I ydrocarbons found at depth (if any). If <br /> 1511 2 <br />