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. GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> FAcalon, Califorwa 95320-1927 <br /> Telephone: (209) 838-9888 <br /> Fwsimde: (209) 838-9883 <br /> December 11, 1998 <br /> Mr Mike Infurna <br /> San Joaquin County Public Health Services, t�Z <br /> Environmental Health Division <br /> 304 E. Weber Ave., 3rd Fl ,r,� <br /> 14A- <br /> Stockton, CA 95202 <br /> Subject Center Street Parts/Kilpatrick-EarthGrains Bakery <br /> 1717 Center St , Stockton, CA 95206 (Site Code 2371) <br /> Workplan for Monitoring Well Installation <br /> Dear Mr Infurna: <br /> At your request we are writing to provide you with a workplan for groundwater monitoring well <br /> installation at the subject property. <br /> We understand that previous investigation had identified soil and/or groundwater contamination <br /> resulting from a former underground storage tank In order to further investigate the nature and <br /> extent of contamination and to provide facilities for long term groundwater monitoring we <br /> propose to install three monitoring wells <br /> A hollow stem auger drill ng will be used to advance eight-inch diameter soil bonngs at three <br /> locations on the property. The bonngs will be drilled to a depth approximately fifteen feet <br /> below the current groundwater surface Each of the bonngs will then be completed as a 2-inch <br /> diameter groundwater monitoring well. The wells will be constructed of schedule 40 PCV <br /> casing with 0.01 inch diameter screen. The screened intervals will extend fifteen feet below and <br /> 5 feet above the current water table In each well, sand pack will fill the annular space from <br /> total depth to a distance 2 feet above the top of the well screen. A two-foot thick interval of <br /> hydrated bentonite will overlie the sand pack Neat cement grout will then be tremmied to the <br /> surface. Each well will be completed with a traffic rated well box and a water-tight locking cap. <br /> During drilling, soil samples will be collected from each boring at intervals of approximately <br /> five feet for descriptive purposes. Selected soil samples including those collected from the <br /> capillary fringe and from the bottom of the bonngs will be submitted for laboratory analysis <br /> gnersonlworkplsn <br />