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i Page 30 of 34 Table 1 Groundwater Elevation and Analytical Data MARCO Service Station#2133 2908 Benjamin Holt Dr,Stockton,CA Weil Depth Product GroundwEEater Groundwater Xylenes Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene Ethylbenzene (total) ME DO Number. Sampled (ft,MSL) (ft,TOC) (ft) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) MW-1 6/18195 992 - -863 099 -- (cont) 9125/96 12 53 -- -11 24 -261 1500 110 97 94 52 25 - 12/4/96 1200 - -10 71 053 .. -- 3/19/97 P 745 -- -616 455 <50 051 <0 5 <0 5 <0 5 <5 02 615197 P 913 - -7 84+ 168 — 8119/97 NP 10 51 -- -922 -138 <50 <0 5 <0 5 <0 5 <0 5 <5 02 11/25/97 P 1081 -- -9 52 -030 3119/98 P 460 -- it -3 31� 621 <50 <0 5 <0 5 <0 5 <05 <5 28 6/24/98 656 — -527, -196 -- -- _ _ 9/10198 P 828 -699 -172 <50 <0 5 <0 5 <05 <0 5 <5 12/17/98 838 - -709 -010 -- __ __ 3110/99 P 617 - -4 88 221 <50 <0 5 <0 5 <0 5 <0 5 <5 23 6/22/99 821 -- -692 -204 -- -- -- 39 9113/99 P 963 - i -834 -142 <50 <0 5 <0 5 <0 5 <05 4,800 18 12/15/99 961 -832 002 -- -- -- 27 3/23/00 P 513 -- -384 448 <50 <0 5 <0 5 <05 <0 5 <2 5 60 6/21/00 735 -- -606 -222 -- -- -- 04 9113100 P 912 -- -783 -177 <50 <0 5 <0 5 <0 5 <0 5 117 155 12115/00 856 -727 056 -- -- — 086 312101 P 665 -536 191 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 46 5110101 665 -536 000 -- -- 2 3 8122101 P 910 -- -781 -245 <50 <0 50 <0 50 <0 50 <0-50 16 1215/01 P 858 — -729 052 — — — I MW-2 11/10/93 288 1689 1 -1401 -- 950 67 72 66 120 3121/94 1644 -1356 045 450 100 6 2 16 83 9/29/94 6/27/94 1629 -- ��13 41 0 15 390 55 13 9 fi 72 - __ - - 12/8/94 15 43 — -1255 580 29 27 62 130 . -- W 318195 254 1297 -- 1009 2 46 3,800180 42 89 370 -- 6/1195 ._ �9111/95 1374 II-1120 -- 4,100 290 51 140 170 1215/95 1 15 1410 -- -1295 -175 — 3/18/96 860 -- 1-745 5 50 4,800 250 18 56 280 - 6/18/95 9611 __ 9125196 1220 -- 8-8 46 -1 01-1105 -259 120 27 <0 5 3 18 <5 - Projects/ARCO/2133/ReportslTables/gwtables2133 As