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WN1181 Quarry Lane Building 300 Pleasanton, CA 94566 (510) 462-4000 ,51, 112-6283FAX & Associates July 29, 1994 BSK Job No- P92219 3 Mr Frank Yoneshige Van Den Bergh Foods Company 1400 Waterloo Road P O Box 9200 Stockton, CA 95208 57 Subject Quarterly Groundwater Monitoring Van Den Bergh Foods Stockton Facility Dear Mr Yoneshige ' BSK & Associates, Inc (BSK) is pleased to submit this report which summarizes quarterly groundwater sampling and analysis performed at the subject Van Den Bergh Foods facility. The two copies of this report should be submitted under a Van Den Bergh Foods cover letter to Ms. Mary Meays at the San Joaquin Department of Health Services 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 I ppm Benzene to 22 ppm Xylenes at depths from 15 feet to 30 feet. Chlorinated hydrocarbons were not detected in R-I 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 samples collected during installation and sampling of three monitoring wells located 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 i 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 Geotechnical Engineering - Engineering Geology •Environmental Services• Construction Inspection &Testing -Analytical Testing