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REPORT ADDITIONAL GROUNDWATER MONITORING WELLS ' INSTALLATION AND DEVELOPMENT VAN DEN BERGH FOODS, COMPANY STOCKTON, CALIFORNIA ' 1.0 INTRODUCTION BSK & Associates, Inc (BSK) has prepared this Report which summarizes activities for ' installation and development of two additional groundwater monitoring wells and sampling, and presents results of analysis from three groundwater monitoring wells at the Van Den Bergh Foods Company's facility located at 1400 Waterloo Road in Stockton, California The general location ' of the site is shown on Figure 1, Vicinity Map These services were completed in general accordance with the BSK Proposal No PR93293 3, ' dated November 2, 1993 and our Work Plan approved by San Joaquin Department of Health Services, dated November 30, 1993 2.0 BACKGROUND ' BSK &Associates, Inc (BSK) understands that a 1000-gallon gasoline tank, a 550-gallon solvent tank, and a 520-gallon diesel tank were removed from a common excavation on June 26, 1986 Analytical results of soil boring R-1 (Stauffer, April 1987) drilled to a depth of 30 feet indicated diesel concentrations ranging from 14,000 ppm to 61,000 ppm and aromatic volatile concentrations ranging from 1 ppm Benzene to 22 ppm Xylenes at depths from 15 feet to 30 feet Chlorinated hydrocarbons were not detected in R-1 No contamination was detected in soil ' borings R-2 or R-3, located approximately 10 feet northeast and northwest from the excavated area ' Results of a groundwater investigation conducted by Roy F Weston in October 1988 indicated no diesel fuel components detectable in soil or water sample-, collected during installation and sampling of three monitoring wells installed approximately 75 feet east, 100 feet northwest and 100 feet south of the former tanks emplacement The monitoring wells were installed to a depth of approximately 65 feet On December 16, 1993 the depth to groundwater was measured in MW-1 by BSK personnel The groundwater was observed to be at a depth greater than 65 feet. In October of 1992 BSK drilled and sampled two soil borings, one boring in the former tank excavation, and one boring approximately ten feet north of the excavation (the latter was completed as a groundwater monitoring well) The results of the soil samples analyzed indicate that petroleum hydrocarbons were detected to a depth of 70 feet in the soil boring completed in the former tank excavation and to a depth of 60 feet in the soil boring completed ten feet north of the excavation Refer to BSK/Remediation Services, Soil and Groundwater Investigation Report, November 10, 1992 for additional data and information In February of 1993, BSK drilled and sampled four soil borings to depths of 74 feet below the ground. surface Results of the analysis of the soil samples from the four borings indicate that petroleum hydrocarbons have not impacted soil beyond a radius of 35 feet from the former underground tank location Refer to BSK/Remediation Services, Soil Investigation and Quarterly I Associates