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Martin Thorpe v �` <br /> 16 October 1487 2 _ W ISSASSOCMrs L <br /> o Collecting water samples from each monitoring well and from the <br /> development water; <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 lead; <br /> o Analyzing the development water for TFHC and BTX by GC/FID to <br /> 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 1) . 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 1987, 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 by Laurie Cotulla of the <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 SJLHD requested installation of three ground water <br /> monitoring wells to determine whether. the fuel hydrocarbons had,migratedto <br />