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California Department of Transportation July 7, 1994 <br /> Project No 102818-01 <br /> INTRODUCTION AND SCOPE OF SERVICES <br /> In accordance ith Caltrans Statewide Contract No 56SO67 and Work Order No 10- <br /> 565067-06, Ni yo re has conducted groundwater monitoring well activities and <br />' groundwater moru n eaintenance facility located at 1603 South B Street <br /> t in Stockton, California (Figu 1) rrope of services included the following tasks 1) <br /> attendance of a prework site visit, 2) preparation of a work plan and site safety plan, 3) <br /> measurement of the depth to groundivater at selected wells, 4) collection and chemical <br />' analysis of nine groundwater samples, 5) abandonment of nine groundwater morutonng <br /> wells, 6) sampling and analysis of soil stockpiles generated during abandonment procedures, <br /> 7) lowering of eight groundwater monitoring wells, and 8) preparation of tlus report <br /> documenting our field activities and findings <br /> SITE BACKGROUND <br />' The property is owned by the California Department of Transportation and has been a state <br /> Nghway repair and maintenance yard since approximately the late 1940s Prior to its use <br /> as a repair and maintenance facility, it %%as reportedly undeveloped land The following <br /> information was obtained from the review of documents supplied by Caltrans and interviews <br /> with Caltrans personnel <br /> In 1978, one of four 5,000-gallon underground storage tanks (USTs) located at the facility was <br /> j reportedly removed due to a leak that had developed An investigation was later conducted <br /> in August of 1987 to assess the area near the USTs Hydrocarbon contamination was <br /> detected in all four soil borings excavated, which were subsequently converted to morutoring <br /> wells Sampling and analysis of the morutoring wells indicated that the groundwater was <br /> also contaminated with hydrocarbons In January of 1988, the remaining three USTs were <br /> removed and soil samples were collected from the tank excavation cavity for analysis Soil <br /> samples collected from UST area reg ealed low levels of hydrocarbon contamination A <br /> 1,000-gallon waste of e ved from the facility in 1989 <br /> a <br /> Five additional groundwater monstoriPgwel;� <br /> we �v <br /> re installed at the site 3n 199Q, it11 another <br /> three installed in 1992 The groundwater level reportedly dropped more than 20 feet from <br />