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M r i i i i i i Ir i <br /> TAB*2 <br /> SUMMARY OF GROUNDWATER ELEVATION AND ANALYTICAL DATA <br /> SHOP 10 MAINTENANCE STATION <br /> STOCKTON,CALIFORNIA <br /> ' TOC Depth to Groundwater Total <br /> Sample TPHg TPHd Benzene Toluene Ethylbenzene <br /> Well I D Elevation Groundwater Elevattan xylenes MTBE(NgfL) <br /> Date (ft-msl) ,ift-bgs) t, (ft•msl) (p9L) (N9/L) (Itgf L) WIL) Will-) WIL) <br /> MW-26 6115198 2121 4883 -2762 <500 <5000 <0 3 <03 .406 <06 <5 <br /> 9W-26 973198 <br /> ell ABantned <br /> TOC=Top of casing elevations <=Less than method detection limns <br /> MSL= Mean Sea Level NA=Not available or applicable <br /> FT=Feet RWQCB=Central Valley Regional Water Quality Control Board <br /> bgs=below ground surface mg/L=milligrams per liter <br /> TPH-g=Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015M pglL=micrograms per titer <br /> TPH-d=Total Petroleum Hydrocarbons as Diesel by EPA Method 8015M (<5)=MTBE concentration calculated by EPA Method 8260 <br /> BTEX=Benzene,Toluene,Ethylbenzene,and Total Xylenes by EPA Method 8020 NM=Not measured TOC elevations and depth to groundwater <br /> MTBE=Methyl Tertiary Butyl Ether by EPA Method 8020 were not measured where indicated <br /> l')Top of casing elevations for Wells MW-5 through MW 9 were surveyed by Caltrans in 1990 and 1991 relative to a reference point on <br /> the Shop 10 site Subsequent measurements were relative to a benchmark elevation referenced to mean sea level Corresponding <br /> groundwater elevations are provided <br />� I <br /> I <br /> Page 10 of 10 S 1PR0.l141 04000041Shop 10lshopl OGWsummary <br />