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TO <br /> 1 <br /> SUMMARY OF GROUNDWATERATION AND ANALYTICAL DATA <br /> STDCKTON MAANCE STATION <br /> STOCKTON,CALIFORNIA <br /> Tow <br />` hen <br /> TPA <br /> hTa Groundwater 'CHIS Gt II Beat= Toluene Ethyl- xene rA MME <br /> f won t R r1�te roe�levatlo� ��ter X� (It�� <br /> VW-2 0210td1996 2190 6317 4127 16 000 <50 3 000 3 100 260 2000 <50 <br /> VW 2 04/11/1996 2190 6163 -3973 — — <br /> VW 2 04123!1996 2190 6137 -3947 54 000 <50 8100 5 600 290 6 500 60 <br /> VW 2 07/0211996 2190 6019 -3929 20 000 1 400 3 000 1700 200 1 700 53 <br /> VW 2 10123!1996 2190 6055 3865 17 000 570 4200 1 300 89 430 430' <br /> VW 2 05129!1997 2190 5557 3367 15 000 <500 2 300 l 600 380 2200 29 <br /> VW 2 10117!1997 2190 5719 -3529 11 000 <500 1 800 580 170 870 22 <br /> VW 2 12129!1997 2190 5699 3509 10 000 570 1 300 1 400 230 l 200E8(5 <br /> VW 2 03116!1998 2190 5370 3180 7400 10000 1 100 860 180 E100 <br /> VW-2 06126!1998 2190 4987 2797 9 000 <5000 1 400 670 330 <br /> VW 2 09/28/1998 2190 5175 2985 B 400 <5000 1 800 530 400 <br /> VW 2 12!02/1998 2190 4989 2799 7 B00 2900 1 100 360 290 VW 2 03/31/1999 22 18 465l 2433 2100 320 1 500 460 750 <br /> VW 2 06/28/1999 22 18 4674 2456 5 700 <100 865 57 <0 2 302 76t <br /> VW 2 09123!1999 2218 4959 2741 4,300 300 1270** 98 3"0* g6g+► 32 <br /> VW 22+ 09123!1999 NA NA NA 4,$O 450 12 qa 1W 4111— <br /> Notes <br /> TOC-Top of casing elevation,MSL= Mean Sea Level <br /> TPH-G-Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015M <br /> TPH D=Total Petroleum Hydrocarbons as Diesel by EPA Method 8015M <br /> BTEX=Benzene Toluene Ethylbenzene and Total Xylenes by EPA Method 6020 <br /> MT13H=Methyl Tertiary Butyl Ether by EPA Method 8020 <br /> NA-Not applicable <br /> <=Less than method detection limit <br /> — =Not measured,sampled tested,or present <br /> "Denotes duplicate sample taken <br /> Denotes sample exceeded the rourteen-day holding period <br /> All groundwater level measurements are presented m feet <br /> mg/1 s mtlltgrams per liter <br /> p&A micrograms per liter <br /> (<5)-MTBI'concentration as calculated by f 1'A Method 8260 <br /> t Denotes MTBE samples analyzed by EPA Method 8260B <br /> NR denotes Not Reported <br /> NU denotes laboratory analysts data not used due to exceedence of sample holding times <br /> All data prior to 311!99 was provided by the previous consultant(PSI) <br /> A"1*after the laboratory result indicates that the compound was detected above the methal detection]tntt,but below the laboratory reporting limit <br /> sm Lsmmma. Page 9 0179 <br />