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1181 Quarry Lane <br /> . Building 300 <br /> . Pleasanton, CA 94566 <br /> (510) 462-4000 <br /> (510) 462-6283 FAX 20 Z <br /> & Associates <br /> May 10, 1995 BSK,JOB NO. P92219.3 <br /> Mr Frank Yoneshige <br /> Van Den Bergh Foods Company <br /> 1400 Waterloo Road <br /> P O Box 9200 <br /> Stockton, CA 95208 <br /> Mq y <br /> Subject Quarterly Groundwater Monitoring Report 19 <br /> April 1995 EIUV��o 19,95 <br /> Stockton Bergh Dods <br /> PE�M/r S�rV��EgLr <br /> ,SES H <br /> Dear Mr Yoneshige <br /> BSK & Associates, Inc (BSK) is pleased to submit this report which summarizes quarterly <br /> groundwater sampling and analysis performed at the subject Van Den Bergh Foods facility Two <br /> copies of this report should be submitted under a Van Den Bergh Foods Company cover letter <br /> to Ms Mary Meays at the San Joaquin County Department of Health Services <br /> 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-1 No contamination was detected in soil <br /> borings R-2 or R-3, located approximately 10 feet northeast and northwest from the excavated <br /> area, respectively <br /> Results of a groundwater investigation conducted by Roy F Weston in October 1988 .indicated <br /> no diesel fuel components detectable in soil or water samples collected during installation and <br /> sampling of three monitoring wells located approximately 75 feet east, 100 feet northwest and <br /> 100 feet south of the former tanks emplacement The monitoring wells were installed to a depth <br /> of approximately 65 feet On December 16, 1993 an attempt was made by BSK personnel to <br /> measure the depth to groundwater in MW-1, the well was observed to be dry <br /> In October of 1992 BSK drilled and sampled two soil bonngs, 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 well) 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 Refer to BSK/Remediation Services, Soil and Groundwater Investigation <br /> Report, November 10, 1992 for additional data and information <br /> Geotechnical Engineering• Engineering Geology •Environmental Services•Construction Inspection &Testing •Analytical Testing <br />