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California Department of Transportation July 7, 1994 <br /> Project No 102818A-01 <br /> INTRODUCTION AND SCOPE OF SERVICES <br /> In accordance with Caltrans Statewide Contract No 565067 and Work Order No 10- <br /> 565067-06, Ni o e has conducted groundwater monitoring activities at the Caltrans <br /> Maintenance a it o t Pf-Ho <br /> th B Street in Stockton, California (Figure 1) Our <br /> scope of services included t & g tasks 1) attendance of a prework site visit, 2) <br /> preparation of a work plan and site safety plan, 3) measurement of the depth to <br /> groundwater at selected wells, 4) collection and chemical analysis of three groundwater <br />' samples, and 5) preparation of tl­us report 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 /> highway repair and maintenance yard since approximately the late 1940s Prior to its use <br /> f <br /> as a repair and maintenance facility, it was reportedly undeveloped land The following <br /> information was obtained from the review of documents supplied by Caltrans and interviews <br /> with Caltrans personnel <br /> Two underground storage tanks were removed from the facility� g g Y in December of 1989 The <br />'i tanks had reported capacities of 5,000-gallons and 10,000-gallons and contained diesel fuel <br /> and gasoline, respectively Laboratory analysis of soil samples collect from the tank <br /> Iexcavation indicated that soil contaminated with petroleum h%drocarbons was present A <br /> PY g <br /> preliminary invests ation of the site N�as conducted u1 March :- 1992 and two soil borings <br /> l <br />' and three groundwater morutoring wells were installed in and - �ar the former tank location <br /> Laboratory analysis of soil and groundwater samples colle_-ed indicted that soil and <br /> groundwater had been impacted by petroleum hydrocarbe- � Additional groundwater <br />' <br /> sampling and analysis was conducted in October of 1993 <br /> P g Y <br /> GROUNDWATER MOMTORING WELL SAMPLING <br /> On May 24, 1994, a re4��)� ti.Ahe inyo & Moore measure -e depth to the static water <br /> 1 level in the threepreviouslycofYd7fthe <br /> ater monitor i 7 wells at the site (Figure 2) <br /> g <br /> } The morutoring wells were fir � ed presence immiscible layers using a <br /> product-sensing interface probe No product was detected 7,e depth to the static water <br /> r <br /> 1 <br /> 1 <br />