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4.0 SUMMARY OF PREVIOUS INVESTIGATIONS <br /> The following sections of this workplan describe past investigations conducted on or near the <br /> LNC site at 110 East Turner Road,Lodi. <br /> 4.1 Soil Sampling <br /> During October 1988,Blymyer Engineers conducted a limited soil investigation beneath four <br /> areas(Areas A through D,Figure 7)of the LNC property(Blymyer, 1988).Soil samples were <br /> collected from five borings drilled by hand auger to a depth of approximately 9 feet bgs(Figure <br /> 7).The samples were analyzed for total petroleum hydrocarbons quantified as gasoline(TPH-g), <br /> total petroleum hydrocarbons quantified as diesel(TPH-d), oil and grease(O&G), and VOCs. <br /> Oil and grease were detected in analytical laboratory reports from soil samples collected from all <br /> areas. No VOCs or petroleum hydrocarbons were detected in any of the soil samples. <br /> Selected shallow soil samples from the five soil borings were also analyzed for various metals. <br /> The analysis results indicated detectable concentrations of aluminum,magnesium,and <br /> chromium in Areas A and D. <br /> During July 1992,The Mark Group conducted a limited soil investigation beneath four areas <br /> (Areas A through D)and the concrete tank formerly used to store bunker oil at the LNC property <br /> (Figure 7). A total of 45 soil samples were collected from 16 soil borings drilled by the hollow- <br /> stem auger method(Figure 7). This sample work included drilling an angle boring and sampling <br /> beneath the concrete bunker area. <br /> Area A soil samples reportedly contained no detectable VOCs and low-level concentrations of <br /> TPH-d at one location. <br /> Area B and C soil samples reportedly contained no detectable hydrocarbons or VOCs. <br /> M nia\D:\EnvironmcntaKLN CM 0152007.wpd 15 <br />