Laserfiche WebLink
r� <br /> MPRE ANK REMOV L SOIL ASSESSMENT <br /> West Charter Way,Stockton,CA <br /> Delo Project No.60-88-586 <br /> Page 4 <br /> 2,5 Undvirround Utilities <br /> All underground utility locations were verified with respective utility companies prior to drilling of <br /> 4=� <br /> soil borings at the site. <br /> 3.0 R ESUS OF SOIL 13ORING TNVESTIGATION <br /> 3.1_Sltg Sails.;,pd Ground water <br /> €r On February 8, 1989, Delta advanced four soil borings at the site in order to evaluate the presence <br /> i., <br /> or absence of petroleum constituents in soils surrounding the existing tanks and product lines. Four <br /> additional borings were advanced the following day in an attempt to define an area of soils free of <br /> 4 ' petroleum constituents in which the new tanks could be installed. Soil boring locations are illustrated <br /> ! in Figure 2, <br /> Samples retrieved from soil borings indicate that soils beneath the site consist of clayey silt and silty <br /> - lY <br /> clay, with a minor fine- to medium-grained sand fraction. The surface of the site is completely <br /> ` paved with a Iayer of asphalt approximately 3 inches thick. Soil borirg logs are presented in <br /> } Appendix A. <br /> Ground water was ew:ountered only in soil boring SB-1 at a depth of approximately 29 feet below <br /> ground surface. Water samples were not collected from this soil boring. All borings advanced at the <br /> ' site were sealed from the bottom of the borehole to ground surface with cement/bentonite grout on <br /> February 10, 1989. <br /> 3 2—Soll Sample,Analvticel Results <br /> h <br /> Soil samples coI:ected by Delta during the drilling of soil borings were analyzed for TPH and BTEX. <br /> Two soil samples were also analyzed for total lead. <br /> Soil borings SB-1 through SB-4 indicated the presence of petroleum constituents at concentrations <br /> exceeding 100 parts per million (ppm) in soils surrounding the existing tanks and product Iines. <br /> s � <br /> Hydrocarbon constituents were also found in soils from soil borings SB-3 and SB-7 (immediately <br /> adjacent to the existing pump islands). Petroleum constituents were not present in soil borings SB-6 <br /> and SB-3, located approximately 25 feet west of the pump islands. Table 2 provides a summary of <br /> analytical results of soil samples collected from soil borings SB-1 through SB-8. Detailed laboratory <br /> reports are presented in Appendix B. <br /> i � <br />