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.• - - <br /> s <br /> L W <br /> Martin Thorpe <br /> October 1987 2., *F1SSASS0CIAMS <br /> o Collecting water samples ' from each .monitoring well and from the.. . <br /> development ,rater; <br /> o Analyzing the ground water samples by GC/FID .for TFHC, ' by EPA Method <br /> 602, gas chromatography/photo ionization ' detection (GC/PID) 'for BTX <br /> by gas chromatography/electron capture detection (GC/ECD) for ethylene <br /> dibromide (EDB) , and by -atomic absorption spectroscopy '(AA).:.:. for <br /> soluble.'ldad; . <br /> o Analyzing the development water for TFHC and BTX ::by GC/FID to _ <br /> r determine the disposal requirements;: and <br /> o Preparing this letter report, which includes:. <br /> A- site description and summary of tasks, performed; <br /> Boring logs and monitoring well construction details; _ <br /> Ground water gradient map indicating direction of ground water flow, <br /> Tabulated laboratory and field analytic results; and <br /> Conclusions and recommendations. <br /> BACKGROUND <br /> The site ,is located at 204 E. Lodi Avenue, at.' the : intersection - of Lodi <br /> Avenue and . Stockton Street in Lodi,.-California (Figure, l) . The property is <br /> owned by Mrs. Mary Lehr of Lodi, California and is currently occupied by a <br /> glass - repair business and a picture-framing shop.: . On 23 January 1957,' 'a <br /> 550-gallon underground leaded gasoline tank located in the southeast .. Corner of - <br /> the building, which failed an integrity test, was excavated and removed by Jim <br /> Thorpe Oil'::Inc. . The tank removal was _witnessed Laurie C to la of the <br /> . rP by L r o 1 h . <br /> Environmental Health Division of : the .San Joaquin Local .Health District . ' <br /> (SJLHD). Analysis of soil 'samples collected during. - the excavation :Indicated <br /> 1,400 parts per million' (ppm) TFHC, 270 ppm toluene^and 18 ppm' xylenes.� Based. <br /> on these results the iSJLHD requested ' installation . of three- ground water, <br /> monitoring :.wells to determine ' whether. . the fuel hydrocarbons had•migrated. to <br />