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R& M = = = = M <br /> TABLE 3�3 <br /> SUMMARY OF GROUNDWATER ANALYTICAL DATA <br /> SHOP 90 MAINTENANCE STATION, CALTRANS <br /> STOCKTON,CALIFORNIA <br /> Sample TOC Depth to Groundwater Total <br /> P TPHd Benzene Toluene Ethylbenzene MTBE <br /> Well I D Date Elevation Groundwater Elevation TPI-Ig(Ngli) IgA) (pgd) 11�9n] �gn] Xylenes ��) <br /> feet bgs feet bgs feet msl (Pgn) <br /> Z5U <br /> CAA <br /> MW-25 9/2b/91 21 95 5728 -3533 <br /> MW-25 1212W--ZTVS— 5642 -3447 <br /> - 5-iV <br /> n µ Rzai <br /> ............ v <br /> ............ <br /> �cr �`1 ^zx t Uzi z r "4i€:a t t <br /> VV-26 10/24/96 2121 5958 1UU2.'+ti4{ a {{p�er5 ,moi k �4f+ y <br /> }„ ------------ <br /> fn u 2IZ. +F to it Lx h`Ki ` > pt4Gt <br /> ♦ 2 <br /> M29197 Itj -3495 <br /> 5261 -31 Q <br /> MW-2b M15/98 2121 4883 <br /> 4 <br /> MW-26 8/25/98 Well abandoned/removed 2 9 59 0 5 3 2 <br /> number of samples 142 121 143 144 141 142 106 <br /> Maximum 231,00000 3,90000 28,000 00 38,800 00 4,000 00 15,900 00 12500 <br /> Minimum 1 0000 1 8000 01500 01500 01500 01500 02500 <br /> Arfth Mean 8,93442 93195 1,64249 1,22586 19515 66106 588 <br /> Std Dev 33,408 28 1,14543 4,94964 5,46664 57833 2,27969 17 60 <br /> lIn-' 05) 1 166 166 166 166 166 166 166 <br /> %UCL 13,588 33 1,10481 2,329581,982 08 27600 97663 872 <br /> Numbers In bold and shade are 112 the detection limit <br /> TPHG a Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015M <br /> TPHD-Total Petroleum Hydrocarbons as Diesel by EPA Method 8015M <br /> BTEX=Benzene,Toluene,Ethylbenzene,and Total Xylenes by EPA Method 8020 <br /> MTBE=Methyl Tertiary Butyl Ether by EPA Method W20 <br /> c=Less than method detection limits <br /> ------- a Not measured,sampled tested,or present <br /> All measurements are presented in feet <br /> mgd Q milligrams per liter <br /> pgB=micrograms per liter <br /> (c5)=MTBE concentrationdetected by EPA Method 6260 <br /> Page 4 TWO 328/99 <br />