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DATA REPORT <br /> DRILLING, SOIL SAMPLING, <br />' QUARTERLY GROUNDWATER SAMPLING <br /> VAN DEN BERGH FOODS, INC. <br /> STOCKTON, CALIFORNIA <br /> 1.0 BACKGROUND <br />' BSK & Associates,Inc (BSK) understands that a 1000-gallon gasoline tank, a 550-gallon solvent <br /> tank, and a 520-gallon diesel tank were removed from a common excavation on June 26, 1986. <br />' Analytical results of soil boring R-1 (Stauffer, April 1987) drilled to a depth of 30 feet indicated <br /> diesel concentrations ranging from 14,000 ppm to 61,000 ppm and aromatic volatile <br />' concentrations ranging from 1 ppm Benzene to 22 ppm Xylenes at depths from 15 feet to 30 feet <br /> Chlorinated hydrocarbons were not detected in R-l No contamination was detected in soil <br /> bonngs R-2 or R-3, located approximately 10 feet northeast and northwest from the excavated <br /> area <br /> Results of a groundwater investigation conducted by Weston in October 1988 indicated no diesel <br /> fuel components detectable in soil or water samples collected during installation and sampling <br /> of three monitoring wells installed approximately 50 feet laterally from the former tanks <br /> emplacement The monitoring wells were installed to a depth of approximately 65 feet Van <br /> Den Bergh Foods reports that these three monitoring wells are presently dry <br /> In October of 1992 BSK drilled and sampled two soil borings, one boring in the former tank <br /> excavation and one boring approximately ten feet north of the excavation (the latter was <br /> completed as a groundwater monitoring welt) The results of the soil samples analyzed indicate <br /> that petroleum hydrocarbons were detected to a depth of 70 feet in the soil boring completed in <br /> the former tank excavation and to a depth of 60 feet in the soil boring completed ten feet north <br /> of the excavation Diesel concentrations in the soil samples from the soil boring completed in <br />' the former tank excavation ranged from none detected at a depth of 75 feet, to a maximum of <br /> 23,000 mg/Kg at depths of 10 feet and 15 feet The concentrations of diesel in the soil samples <br /> from the soil boring located 10 feet north of the excavation ranged from none detected at a depth <br />' of 70 feet to a maximum of 130,000 mg/Kg at a depth of 15 feet Petroleum hydrocarbons were <br /> not detected in the groundwater samples collected from the groundwater monitoring well installed <br /> by BSK. <br /> 1 <br />' r•ssociates <br />