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October 25, 1993 <br /> Water Works concluded that waste oil contamination did not appear to spread laterally beneath <br /> the Site building - <br /> On December 15, 1989, soil was overexcavated from the western wall near the former <br /> diesel tank area Analytical test results indicated a TPHd concentration of 30 6 ppm at 6 ft, <br /> TPHd was not detected in samples from depths of 2 ft or 16 ft <br /> 1.2 Purpose <br /> The extent of soil contamination beneath the western property boundary associated with r <br /> the former diesel tanks had not been adequately constrained by the previous work <br /> Groundwater contamination detected in MW 1 required further assessment The purpose of this <br /> investigation was to calculate a site-specific groundwater gradient, to evaluate the lateral and <br /> T vertical extent of soil contamination along the western property boundary associated with the <br /> o assess groundwater contamination q <br /> former diesel tanks, and t g ' <br /> 2.0 ENVIRONMENTAL SETTING <br /> The Site is located near downtown Stockton at the northeast corner of the intersection 1 <br /> of French Camp Turnpike and Lincoln Street The Site appears on the U S G S 7 5-Minute <br /> Senes Topographic Map of the Stockton West Quadrangle (1987) at Township 1 North, Range <br /> 6 East, Section 10 The geographic coordinates of the Site are approximately 37°56'00" North <br /> --- - =L-atitude and=121°17'30'West_Longitude <br /> -- _ _2-A� LocaVGeologY <br /> The Site is located near the center of the Great Valley Physi6graphic-Province The <br /> northern half of the province is the Sacramento Valley, bordered on the north by the Klamath , <br /> Mountains, on the east by the Sierra Nevada Range, on the west by the Coast ranges, and on <br /> the south by the <br /> Stockton Fault The southern half is the San Joaquin Valley, bordered on the <br /> north by the Stockton Fault, on the east by the Sierra Nevada Range, on the west by the Coast <br /> Ranges, and on the south by the Transverse Ranges The Site is located approximately 112 mi <br /> north of the interpreted location of the Stockton Fault The Stockton Fault is not evidenced on <br /> the surface in this area <br /> The Site is underlain by Quaternary basin and fan deposits of the Great Valley <br /> Sedimentary Sequence, which includes arkosic alluvium of the Modesto-Riverbank Formation <br /> ROGER <br /> FC(DTT <br /> -2 - A 550CIA TE S <br /> 325-N U'r <br />