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IN <br /> ER <br /> NEW <br /> I�011��M-V4 <br /> FUN_ <br /> Western Geologic Resources, Inc. was contracted by Chevron USA to drill five soil borings <br /> to a depth of approximately 40 feet below ground :.!lirface and convert the soil borings to <br /> groundwater monitoring wells. <br /> Their report, dated April 13, 1989, described the investigation and indicated low to moderate <br /> soil contamination (total petroleum hydrocarbons (TPH as gasoline, EPA Method 5030/8015) <br /> concentration of 390 ppm)in borings B-1, B-2, and B-5, all on the southern half of the site. <br /> Groundwater contamination was also detected in the monitoring wells that correspond to soil <br /> borings B-1, B-2, and B-5 (MW-1, MW-2, and MW-5, respectively). TPH concentrations in <br /> these wells ranged from 4 mg/L to 30 mg/L. Benzene concentrations ranged from 35 lig/L <br /> to 3,600 pg/L. <br /> 1.3 OBJECTIVES OF THIS INVESTIGATION <br /> Two distinct objectives have been defined for this investigation. <br /> 0 To adequately characterize the groundwater conditions at the site <br /> 0 To demonstrate the precision and accuracy of the CPT-installed BAT' <br /> probe groundwater samples when compared to the California Code of <br /> Regulations (CCR)Title 23 groundwater monitoring well samples. A <br /> statistical comparison will W made to compare the data sets. <br /> 0:\915038Wik9-0123.FL 2 <br />