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r � <br /> A <br /> e <br /> KAPREALIAN ENGINLERING, INC. <br /> K E I Consulting Engineers FEB 14 1989 <br /> P.O. Box 913 <br /> BENICIA,CA 94510 Es�IVIRUi'lf,St;iJTr�� FEALTH <br /> (415)676-9100 (707)746-6915 PERMIT/SERVICES <br /> KEI-P38-0810.WP1 <br /> February 10, 1989 <br /> Ms. Diane Hinson <br /> San Joaquin Local Health District <br /> 1601 E. Hazelton Avenue <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> RE: Work Plan/Proposal <br /> Mobil Bulk Plant <br /> 500 E. Grantline Road <br /> Tracy, California <br /> INTRODUCTION <br /> I. Background: <br /> In August, 1988 Kaprealian Engineering, Inc. (KEI) collected <br /> soil samples following the removal of one 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 /> t analyzed by 'Sequoia Analy-_ical Laboratory in Redwood City, <br /> California for total petroleum hydrocarbon (TPH) as gas- <br /> oline, benzene, toluene, xylenes and ethylbenzene . (BTX&E) . <br /> Analytical results of the soil samples showed Y mpl how TPH as <br /> gasoline of 200 and 240 ppm and BTX&E ranging from non- <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 130 <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.,.9oo_..ppm;....however,--the.-three-borings __.. __ <br /> from.. the south side of the site (EB1, 2, and .3 on Site Plan <br /> E attached) had less than 10 ppm TPH while the three borings <br /> from the north side of the ..site (EB4, . 6, .and 6 on Site Plan <br /> Attached) all had in excess of 1.000 ppm TPH as diesel abov6 <br /> the water table.: The complete results . of the .exploratory <br /> boring drilling are presented in KEI's report. KEI-P88-0810-1 <br /> datead December 9, 1988. <br />