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15 January 1998 <br /> AGE-NC Project No 96-0254 <br /> Page 7 of 16 <br /> 3 2 SOIL SAMPLE COLLECTION AND ANALYSIS <br /> Initially, AGE proposes to advance five soil probe borings in the vicinity of the former UST to <br /> evaluate the lateral and vertical extent of the petroleum hydrocarbon impact on soil and ground <br /> water Proposed probe boring locations are illustrated in Figure 2 and are as follows <br /> • Proposed probe boring 1 (PB 1)will be located twenty feet north of the location of soil boring <br /> B2 to evaluate the vertical extent of petroleum hydrocarbon compounds, <br /> • P132 will be located 30 feet east of soil boring B2 to evaluate the lateral and vertical extent <br /> of the petroleum hydrocarbons, <br /> • P133 will be advanced 20 feet west of soil boring B3 to evaluate the lateral extent of the <br /> petroleum hydrocarbons, <br /> • P134 will be located 20 feet south of soil boring B2 to evaluate the lateral and vertical extent <br /> of the petroleum hydrocarbons, and <br /> • PBS will be advanced 20 feet north-northwest of monitoring well MW-1 to evaluate the <br /> lateral and vertical extent of the petroleum hydrocarbons <br /> The proposed referenced distances are approximate and may be modified due to field conditions <br /> or results of preceding borings with approval by the PHS-EHD The proposed probe; boring <br /> designations utilized here are for clarity of discussion in this work plan,the final boring designations <br /> will continue the boring numbering system currently in use on the site Due to the low petroleum <br /> hydrocarbon concentrations encountered in the analyzed soil sample collected from boring B-6, <br /> which also lacked field indications of significant hydrocarbon impact in all collected soil samples, <br /> additional investigation northwest of the site is not proposed <br /> Proposed probe borings P132 through P134 will to be advanced to 20 feet bsg PB 1 and P135 will be <br /> advanced to 35 feet bsg or until the field observations and field screening using an organic vapor <br /> monitor (OVM) indicate that detectable petroleum vapors are not present in the soil samples <br /> screened from two consecutive five-foot intervals <br /> Soil samples will be collected from PB2, P133, P134 and PB5 at 5-foot intervals beginning at 10 feet <br /> bsg extending to the total probe boring depths, and soil samples will be collected from continuous <br /> cores from the probe boring north of the former UST beginning at 5 feet bsg <br /> Field procedures for advancement of probe borings and collection of soil samples are presented in <br /> Section 4 1 1 Selected soil samples from each probe boring will be submitted for laboratory analysis <br /> with concurrence of the PHS-EHD The selected soil samples will be analyzed by a State of <br /> California Department of Health Services (DHS)-certified laboratory for the following constituents <br /> Advanced GeoEnvironmental,Inc <br />