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Pa 9 of 20 Table 1 Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd,Tracy,CA Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (ft,MSL) (ft,TOC) (ft,MSL) Change(ft) (ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) ATR-5 9112101 P 1035 -- -012 150 <0 50 <0 50 <0 50 <0 50 92 16 (cont) 12/19/01 Well inaccessible 3114102 Well inaccessible ATR-6 3/10/89 4936 -- -- -- - <200 <0 5 <0 5 <0 6 <0 5 -- 6121/89 11 54 3781 -- <50 <0 3 <0 3 <0 3 03 9/18/89 1160 3775 006 <50 05 13 03 38 - -- 12/27/89 1157 3776 003 <50 <0 3 <0 3 <0 3 04 -- -- 4/18/90 1168 3767 -011 - <50 19 24 06 5 -- - 10/16/90 -- -- -- <50 <0 5 <0 5 <0 5 <0 5 - 10/19/90 1180 3755 -- -- ._ __ _- _. 1/10/91 1164 3771 016 <50 <0 5 <0 5 <0 5 <0 5 -- -- 4/10191 1152 3783 012 <50 <0 5 <0 5 <0 5 <0 5 -- 7/10/91 11176 3759 -024 <50 <0 5 <0 5 <0 5 <0 5 - -- 9124/91 1195 3740 -019 - <50 <0 5 <0 5 <0 5 <0 5 -- 1123/92 1166 3769 029 <50 <0 6 <0 5 <0 5 <0 5 -- -- 4/20/92 1156 3779 010 -- -- -- __ -_ _. .. 4/21192 -- -- -- - <60 <0 5 <0 5 <0 5 <0 5 -- -- 7/8/92 1172 3763 -- -- <50 <0 5 <0 5 <0 5 <0 5 - 10/7/92 1182 3753 -010 - <50 <0 5 <0 5 <0 5 <0 5 -- 1/18/93 1104 3831 078 <50 <0 5 <0 5 4 5 <0 5 4/14/93 1142 3793 -038 310 75 <0 5 <0 5 <0 5 -- 8131193 .. .. -- -- -- 1 O/Z7/93 -10/27/93 1184 3751 -- <50 <0 5 <0 5 <0 5 <0 5 -- -- 2/17194 -- -- __ 5/20/94 -- -- -- - I W7194 1186 37 50 -- <50 <0 5 <0 5 <0 5 <0 5 - -- 12/16/94 1154 37 81 0 31 - <60 <0 5 <0 6 <0 5 <0 5 -- 2/28195 1165 3770 -011 - <50 <0 5 <0 5 <0 5 <0 5 - 4126195 -- .. -- 7127195 - -_ _ -- 10/26/95 1218 3717 -- <50 <0 5 <0 5 <0 5 <0 5 - -- 2112196 1157 3778 0 61 - <50 <0 5 <0 5 <0 5 <0 6 -- 4/18196 1191 3744 -034 -- -- -- __ __ 7/18/96 1201 3734 -010 <50 <0 5 <0 5 <0 5 <0 5 10 11/15196 1263 3672 -062 -- -- -- -- -- _- Projects/ARCO/2093/ReportatTableslgwtables2093 As