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PRE-TANK REPLACEMENT Site Assessment Results <br />4315 WATERLOO RD, STOCKTON, CA <br />Aegis Project No. 89-047 <br />Page 6 <br />3.3 PETROLEUM HYDROCARBONS IN SOIL <br />A total of fourteen soil samples were submitted to a state certified <br />laboratory and analyzed for petroleum hydrocarbons. The results of <br />analyses performed on the soil samples are summarized in Table 1. The <br />certified laboratory reports are contained in Appendix C. The <br />following subsections present the results of analyses performed on <br />soil samples from the existing and proposed underground storage tank <br />locations. <br />3.3.1 PETROLEUM HYDROCARBONS IN SOIL: EXISTING TANK BASIN <br />A total of four soil borings were drilled around the existing tank <br />basin. Samples SB-9/D (20 ft.), SB-10/B,D (10, 20 ft.), SB-11/D <br />(20 ft.), SB-12/B,D (10, 20 ft.) from soil borings SB-9 through SB- <br />12, respectively, were submitted to a state certified laboratory for <br />analysis. As shown in Table 1, Petroleum hydrocarbons as gasoline were <br />detected at low concentrations in four of the samples submitted from <br />this area. Petroleum hydrocarbons were not detected in two of the <br />samples analyzed from this area (existing tanks). Petroleum <br />hydrocarbons as diesel were detected, at low concentrations, in <br />samples submitted from soil borings SB-10 and SB-12 (Table 1, Figure <br />2) <br />3.3.2 PETROLEUM HYDROCARBONS IN SOIL: PROPOSED NEW TANK LOCATION <br />A total of six soil borings were drilled within the proposed new tank <br />location (figure 2). Samples SB-1/D (20 ft.), SB-3/C (15 ft.), <br />SB-4/C (15 ft.), SB-7/A (5 ft.) and SB-7/B (10 ft.) from borings SB-1, <br />SB-3, SB-4 and SB-7, respectively, were submitted to a state certified <br />laboratory for analysis. As shown in Table 1, petroleum hydrocarbons <br />were detected in two of the samples submitted from this area (new tank <br />location). Low level toluene and xylenes were detected in samples <br />submitted from soil borings SB-4 and SB-7 (Table 1, Figure 2). <br />3.3.3 PETROLEUM HYDROCARBONS IN SOIL: FUEL ISLAND <br />Samples SB-6/B,C (10, 15 ft.) and SB-8/B (10 ft.) from borings SB-6 <br />and SB-8, respectively, were submitted to a state certified laboratory <br />for analysis. Petroleum hydrocarbons as diesel and aromatic volatile <br />organics (BTEX) at low concentrations were detected in the samples <br />submitted from boring SB-6.