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TABLE 2 Historical Groundwater Quality Data (Results in ug/l unless otherwise indicated) Manna Pro Facility 4004 South EI Dorado Street Stockton,California WELL DATE pH** COND ** B T E X BTEX TPH—g TPH—d Total Lead ID units mhos cm MW-7 02/03/93 82 1,780 39 <03 <0 3 <05 39 150 NA <5 04/15/93 73 1 490 31 08 <03 <05 32 120 NA <5 07/19/93 78 2 420 38 <03 <03 <05 38 170 NA <5 10/27/93 77 1,710 16 03 <03 <05 16 110 NA <5 01/10/94 77 1 680 5 1 <03 <05 6 120 NA <5 04/14/94 73 1,760 43 10 <03 08 61 81 NA <5 MW-8 02/03/93 79 1,650 <03 <03 <03 <05 - <10 NA <5 04/15/93 76 1 180 <03 <03 <03 <05 — <10 NA <5 07/19/93 81 2,240 <03 <03 <03 <05 —— <10 NA <5 10/27/93 77 1 490 <03 <03 <03 <05 —— <10 NA <5 01/10/94 77 980 <03 <03 <03 <05 — <10 NA <5 04/14/94 72 1,400 10 13 07 27 57 14 NA <5 MW-9 02/03193 79 1 050 <03 <03 <03 <05 -- 44 NA <5 04/15/93 73 1,020 09 04 04 <052 2 47 NA <5 07/19/93 78 1,600 <03 <03 <03 <05 <10 NA <5 10/27/93 78 975 <03 <03 <03 <05 — <10 NA <5 01/10/94 79 1,050 <03 <03 <03 <05 _ <10 NA <5 04/14/94 65 1,090 <03 05 <03 09 1 4 23 NA <5 MW-10 02/03/93 81 1,040 5 <03 <03 <05 5 130 NA <5 04/15/93 74 960 2 1 <03 <05 3 130 NA <5 07/19/93 79 1,340 05 <03 <03 <05 05 95 NA <5 10/27/93 82 936 06 <03 <03 <05 06 <10 NA <5 01/10/94 78 950 07 2 1 08 5 110 NA <5 04/14/94 74 970 04 08 61 09 82 150 NA <5 EW-1 01/10/94 74 1120 33,000 31,000 2,500 10,000 76,500 130,000 NA NA 04114194 1 NSI NSI NSI NSI NS NSI NSI NSI NSI NS unfiltered sample--total lead ** = field measurement(laboratory analyses before October 29, 1992) NA = not analyzed NS = not sampled B — benzene T = toluene E = ethylbenzene X — total xylenes BTEX = total BTEX TPH—g = total petroleum hydrocarbons—as—gasoline TPH—d = total petroleum hydrocarbons—as—diesel fuel Frmhos/cm = micro—mhos per centimeter I 2819TO54 WK1 Page 3 of 3 ❑❑® GROUNDWATER ❑❑❑ TECHNOLOGy ,