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X <br /> .............. ............... HAM <br /> 11 1 47MM-0-A 1_7 <br /> Ur �ME -_W- � �-4 -' <br /> �P 4Ar1N_1:_M K MN02' bg-Y-T��Iv- 1W. <br /> WE <br /> PROPOSED PROTOCOL FOR 111MLLATION OF HONITORING WELLS AT <br /> CHEVAO11 SERVICE STATION 9-1910, <br /> 45 EAST HARDING WAY, GTOCKTOH# CALIFORNIA <br /> CA Engineering, Science, and Technology, Inc. (EA) has been <br /> retained by Chevron U.S.A. Inc. to monitor potential ground-water <br /> contamination near an excavation of the underground tank field At <br /> former Chevron Service Station 9-1918, located at 45 Cant, Harding <br /> Way, Stockton, California. To determine the txtent and level of <br /> Potential ground-venter contamination, Chevron proposes to drill <br /> throe soil borings and Install monitoring wclZs in those borings. <br /> The proposed well locations are shown in Figure I . <br /> Soils beneath and around the tank field Ara to be excavated, and <br /> the excavated coils are to be aerated CA site. The proposed <br /> locations Indicated on Figure 2 will be -djut;ted as necessary to <br /> allow for the const. ict,on of the !Poilr, piles. The locations <br /> are specific onouak ­ + that two wells will be drilled <br /> downgradlent of A. 1 +ni '.XCdvAtion and vno vili be placed <br /> upgradl*nt as Inc? '1Y IrXcated an Figure 2. All wells will be <br /> placed so thE,, vo,os,*ini ddmmot and c4mpromiee and interference <br /> with otht.; s.t minjmf,!_­. <br /> Soil mc:titarina v411c w1j., <br /> be drilled and Installed according to <br /> the qei.rral quIde)ines of the C&I:Aqornia State Water Resources <br /> Contro. 110-�rd t.: *'C: 1itorn1a Underground Storage Tank Regula- <br /> tions* L-td ..' .n ,Ptclilc guidelines of San Joaquin County. <br /> Unless Otsiurwizo specified by City and County guidelines, the <br /> soil borings shall be drilled with 8 hollow-stem auger to <br /> perennial ground water or to a minimum depth of 100 foot if <br /> ground water is__not encountered. Xf g round--va ter-is-*ncouriterad_ <br /> at a% depth of lose than .100 fact, the soil borings will be <br /> drilled to 20 feet below the lowest anticipated ground-water <br /> level, which appears to be 41 foot as observed In a water voll' <br /> less than ,i half mile from the sit*. However, v <br /> *Ila will not <br /> extend through laterally extensive clay layers that lie below the <br /> water table: if there is at least 5 feet of competent clay below <br />