Laserfiche WebLink
k IAI <br /> ❑�® GROUNDWATER <br /> TECHNOLOGY, INC. <br /> ❑ <br /> 01L'RECOVERY SYSTEMS 1632 Tribute Road, Suite G, Sacramento, California 95615 (916►921.1800 <br /> I <br /> May 13, 1987 <br /> 4 27--2745 .302 <br /> I� <br /> II <br /> i <br /> Laurie Cotulla <br /> 1 San Joaquin Local Health District <br /> P.Q. Box 2009 <br /> Stockton, CA 95201 <br /> f; RS- Former Sxxon Service Station, 909 West EUammer Lane <br /> 1 <br /> i - <br /> Dear Ms . Cotulla: <br /> Thisi1letter is to inform you of Groundwater Technology, <br /> Inc. 's (GTI) proposed procedures for continued investigation of a <br /> suspected subsurface hydrocarbon loss at the former Exxon Service <br /> f Station loycated at 909 West Hammer Lane in Stockton, California. <br /> A leakage of an unknown quantity of gasoline is suspected to have <br /> occurred in the area of the underground fuel storage tanks . A <br /> site sketch showing the underground tank and piping locations is <br /> i provided f'or your reference (see Figure 1) . <br /> The <br /> .11 <br /> urpose of this investigation is to further define the <br /> extent and magnitude of the impact to soils and groundwater. The <br /> following procedures outline GTI 's methodology in conducting the <br /> investigation. - <br /> F <br /> I' <br /> 1 . Two deep soil borings will be drilled to define the vertical <br /> extent of soil contamination and permit the construction of <br /> groundwater monitoring wells to evaluate the impact on the <br /> shallow groundwater system. The site sketch shows the <br /> proposed location of the two borings (see Figure 1 ) . <br /> g <br /> 2 . The monitoring wells will be constructed of 4--inch machine <br /> slotted PVC screen and casing installed within a 10-inch <br /> borehole (see Figure 2) . The screened interval will extend <br /> a minimum of 10 feet above and 20 feet below the water table <br /> ( unless a competent aquitard is encountered less than <br /> t 20 feet below the water table) . Bentonite overlain by <br /> } cement grout will be used to seal the annular space above <br /> the screened interval (see Figure 2 for a typical monitoring <br /> welllconstruction) . <br /> j <br /> Offwes throughoul Ow U.S., Canada and Owywas <br /> fWestern offices in:Canwrd, CA; Tormnce, CA;Engleiaiod, CO,- Temim, AZ <br /> I �9 <br /> t it <br />