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s <br /> El <br /> - �GR;O�U�NTDWAT�ETRy �+ <br /> ai <br /> ❑a 1 liCH OLOGI 1NL. hia?'Crihuie Rn;id,tiuilr C.Sacr3mrislu.C:,liinmi,<�:,iL;011;021-18110 <br /> November 15, 1988 <br /> Project No, 202./799-5055 <br /> Mr. Kenneth Olds <br /> Superintendent <br /> Lammersville School District <br /> 16555 West Von Sosten Road <br /> Tracy, CA 95376 <br /> RE: LAMMERSVILLE SCHOOL <br /> 16555 WEST VON SOSTEN ROAD <br /> TRACY, CALIFORNIA <br /> Dear Mr. Olds: <br /> Groundwater Technology, Inc. (GTI) presents this letter as <br /> subsurface investigation at <br /> an update report on the continuing <br /> the above-referenced site. The initial results of GTI's work at <br /> in a Subsurface Hydrocarbon Investigation <br /> the site were presented <br /> Report, dated August 10, 1987. <br /> The initial work steps carried out in June 1987, included <br /> installation of five monitoring wells (rigure 1 , Appendix I) , <br /> groundwater monitoring, and collection of soil and water samples <br /> which were analyzed for benzene, toluene, ethylbenzenas gasoline <br /> xylene (BTEX) , and total petroleum hydrocarbon (TPH) <br /> concentrations. No hydrocarbons were encountered in the analyzed <br /> soil samples, but dissolved hydrocarbons were found in water <br /> ve monitoring wells (MWS) , with TPH <br /> samples collected from all fi <br /> as gasoline concentrations ranging from 6,958 parts per billion <br /> (ppb) in MW-2 to 32.5 ppb in MW-4. The well head elevations were <br /> - <br /> —_-- --._.._:.------_._-_--surveyed....-to.-an...arbitrary datum of 10C feet. Monitoring data <br /> __ offices throughout the U.S..Canada and ovmeas <br />