Laserfiche WebLink
u <br /> PREL11vl1NARYHYUROG'OLOGIST A.SSESSM-ENT RFFORT <br /> 14800 West Frontage Road <br /> Manteca, California <br /> Delta Project No. 40•&479 <br /> Page 10 <br /> 3.5 Soil Analytical.Results <br /> On April 26, 1989, two soil borings, SB-3 and SBA, were advanced to depths of 46.5 and 41.5 feet, <br /> respectively. Soil samples were collected at 5-foot-depth intervals and screened with a photoionization <br /> detector (PID). The PID readings and field observations were recorded on the soil boring Iogs in <br /> Appendix A. Sample selection for laboratory analysis was based on PID readings and field observations. <br /> Samples were analyzed using EPA Method 8260 for BTEX,EDC, EDB,and TPPH. Laboratory reports <br /> are presented in Appendix B. The results of soil analyses are listed in Table 7. Two samples were <br /> analyzed from SB-3 at 15 and 30 feet below grade. Benzene concentrations in those samples ranged from <br /> 0.5 ppm (SB-3-3) to 0.015 ppm (SB-3-6). Benzene concentrations in soil samples from roil boring SB-4 <br /> ranged from 0.7 ppm (SB4-3) to 0.054 ppm (SB-4-5). TPPH concentrations ranged from not found (SB- <br /> 4-5 and SB-3-6) to a high of 190 ppm (SB-4-3). Laboratory reports for the soil samples are presented in <br /> Appendix B. <br /> TABLE 7 <br /> Soil Boring Sample Analytical R;sults <br /> Depth <br /> - Location feet Benzene Toluene Eth ]benzene E.DC EbB Xylenes TPPH <br /> NF, <br /> SB-3-3 15.0 0.5 1.2 08 NF <br /> $.0 78.0 <br /> 4� <br /> SB-3-6 30.0 0.015 0.010 NF NF NF 0.010 NF <br /> S13-4-3 15.0 0.7 4.5 4.2 NF NF 24.0 190 <br /> SB 4-3' 13.0 0.7 3.3 3.1 NF NF 1910 150 <br /> ,., SB-4-5 25.0 0.054 0.012 NF NF NF 0.018 NF <br /> NOTES: <br /> All results are listed in parts per million (ppm). <br /> NF = Not Found. <br /> i ' <br /> 'Duplicate Analysis, <br /> 3.6 Ground GVatet Anel Icsl Results <br /> Soil borings SB-3 and SB-4 were completed-as-monitoring wells MW-3 and MW-4- The total depth of -each well is 46.0 feet and 40.0 feet, respectively. Ground water samples were collected from the four <br /> existing monitoring wells, MW-I, MW-2, MW3, and MW-4. Water samples were analyzed using EPA <br /> i <br /> Method 8260 for BTEX,EDC,EDB,and TPPH. The results of these analyses are presented in Table 8. <br /> Benzene concentrations ranged from a Iow of 1.7 parts per billion (ppb) at monitoring wells MW-2 to a <br /> a,� high of 1,400 ppb at monitoring well MW4. <br />