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KAPREALIAN ENGINEERING$ INC. <br /> Consulting Engineers <br /> P. 0. 8dx 913 <br /> BENICIA, CA 91510 <br /> (415)676•9100 (707)746•6915 <br /> KEI_P88-0810.W1 <br /> February 22, 1989 <br /> Ms. Diane Hinson <br /> San Joaquin Local Health District <br /> 1601 E. Hazelton Avenue <br /> P.O. Box 2009 <br /> Stockton, C'j 95201 <br /> RE: Work Plan/Proposal <br /> Mobil Bulk Plant <br /> 500 E. Grantline Road <br /> Trac California <br /> INTRODUCTION <br /> Z. <br /> Background: <br /> In August, 1988 Kaprealian Engineering, Inc. (KEI) collected <br /> soil samples following the removal of cne gasoline storage <br /> tank at the referenced site. Two soil samples and one water <br /> sample (collected at depths of 10 to 12.5 feet) were <br /> analyzed by Sequoia .Analytical Laboratory in Redwood City, <br /> California for total petroleum hydrocarbon (TPH) as gas <br /> - <br /> aline, benzene, toluene, xylenes and ethylbenzene (BTX&E) . <br /> Analytical results of the soil samples showed TPH <br /> gasoline of 200 and 240 ppm and BTX&E ranging from non- <br /> as <br /> detectable to 6.9 ppm. The water sample from the pit had <br /> 1.7 ppm TPH as gasoline and BTX&E ranging from 1.6 to Z30 <br /> ppb. <br /> To continue defining the. extent of soil and ground water <br /> contamination beneath the site, KEI submitted . a workplan <br /> dated September 16, 1988 calling for the installation of six <br /> borings.' The six borings were installed on November 21, <br /> 1988 to depths of 12 to 13 feet. Water was encountered__in <br /> __-_ - the borings at-: depths of 11 to 12 feet. Soil samples <br /> collected from the borings had 'TPH as :gasoline and diesel <br /> ranging .from. <1.0 to 2,900. ppm; however, the. three borings <br /> from the south side of the site (EB1, 2, and 3 on Site Plan <br /> attached) had less than 10 ppm TPH while the three borings <br /> from the north side -cf the site (EB4, 5,. and 6 on Site Plan <br /> Attached) all <br /> - _ had in excess of 1000 <br /> PPM TPH as dieselabove : <br /> water table. The complete results of .the exploratory <br /> baring drilling are presented in KEI's report KEI-P88-0810-3. <br /> dated December 9, 1988. <br /> E <br />