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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station 84932 16 E Harding Way Stockton Caldamia Well Depth Groundwater LPH Groundwater Ethyl Xylenes MtBE ME Wen Date Elevation to Water Elevation Thickness Elevation TPHg Benzene Toluene benzene (total) 8020 (8020/8260) DO Number Sampled (ft MSL) ft TOC) (ft MSL) (ft) Chane(ft) (ppb) (ppb) (ppb) b) (ppb) (ppb) ( /L) MW 9 07/20/01 P 11 24 26 49 1525 000 — 200 12 0 56 <0 50 17 2 8 <20 — 10IM01 P 28 36 17 12 0 00 1 87 690 33 0 93 14 12 <2 5 <20 12 01115102 P 2789 1865 0 00 047 540 - <5 0 <50 <5 0 <5 0 <25 <0 50 26 04/11/02 P 2703 1579 000 086 170 12 <0 50 <0 50 <0 50 3 5 .10 36 07/12x02 P 2794 1670 000 -091 130 — 4050 16 <0 50 0 87 <25 -060 31 11/20102 P 3052 1928 000 258 120 075 0 66 <O$0 <0 50 -25 <0 50 030 01/30/03 P 2974 1850 000 0 78 100 1 5 067 -050 <0 50 <25 -050 042 04!28!03 P 29 06 1782 000 0 fib 95 <0 50 <0 50 <0 50 <0 50 — <0 50 165 07129103' P 3024 1900 000 1 18 130 5 083 <0 50 <O 50 <0 50 — <0,50 — 10108-09103 P 3184 20 60 000 160 <50 <0 50 078 <0 50 077 — <0 50 0 68 01112/04 P 3158 2034 000 0 26 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 210 04126/04 P 3003 18 79 0 W 155 <50 <0 50 <0 50 <0 50 -050 — <0 50 — 07113104 P 3196 2072 0 DO 193 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — 10/26/04 P 33 30 22 06 0 DO 134 <50 <0 50 -050 -050 <0 50 — -050 — 01112105 P 3257 2133 0 DO 073 <50 <0 50 <0 50 <0 50 <0 5o — <0 50 — 0411 3/05 P 37 66 2042 000 0 91 <50 c0 50 <0 50 <0 b0 <0 50 — <O so 6 7 MW 10 07112102 P 11 32 28 85 1753 0 00 — <50 <0 50 14 <0 50 0 52 <2 5 <0 50 2 8 11 r2OM2 P 3141 2009 0 00 2 56 <50 -050 <0 50 -050 <0 50 <2 5 <0 50 092103 01130103 P 30 59 1927 0 00 082 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 192 04!28103 P 2983 1851 0 00 076 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 162 07129703' P 3142 2010 ODD 1 59 <50 5 <0 50 <O 50 <0 50 <0 50 — <0 50 -- 10108-09103 P 3296 21 64 O OD 1 54 <50 4 50 1 4 <0 50 1 1 — <0 50 1 43 01112/04 P 3233 21 01 0 00 063 <50 <0 50 0 50 <0 50 0 51 — <0 50 2 DO 04/26/04 P 3081 1949 000 1 52 <50 <0 50 -050 <0 50 <O 50 — <0 50 — 07/13/04 P 3219 2087 0 00 138 <50 <0 50 <0 50 <0 50 -050 — <0 50 — 10/26104 P 3427 2295 D 00 2 08 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — 01!12105 P 33 54 2222 000 0 73 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 <50 <0 s0 <0 50 <0 60 <0 50 <0 50 31 04!13!05 P 3494 19 B2 0 00 2 60 — MW 11 07/12102 P 1105 2903 1798 000 — <50 <0 50 14 <0 50 081 -25 -050 3 0 11!20!02 P 3173 2088 000 2 70 <50 <0 50 <0 50 <0 50 <0 50 <25 -050 053 01 MGM P 3090 19135 000 083 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 173 04!28103 P 3014 1909 000 076 <50 -050 <0 50 <0 50 <0 50 — <0 50 132 07!29103• P 3168 2063 0 W 154 <50 5 <0 50 <0 50 -050 <0 50 — <0 50 -- 10106-09703 P 3330 22 25 000 162 <50 <0 50 D78 <0 50 087 — e050 071 01112104 P 3264 2159 0 00 0 66 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 070 04)26104 P 31 12 2007 0 DO 1 52 <50 <0 50 <0 50 <0 50 <0 50 — <O 50 — 07M 3/04 P 3251 2146 0 00 139 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — 10126104 P 3460 2355 000 209 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — 01/12105 P 3374 2269 000 0 86 <50 <0 50 <0 50 <0 50 -050 <0 50 — <50 <0 50 <0 50 <0 50 <0 50 <0 50 1 3 04113705 P 31 31 20 26 p 00 243 — SVE 1 09/05100 P 11 84 2645 1447 0 00 — 66 600 1 77D 8 000 2 550 12 900 1 140' — — 11/02M P 2711 1513 0 00 -0 66 4 750 152 469 164 823 212 212/1 200 2 8 03105101 P 2640 1456 0 00 057 72 300 2 09D 10100 2 710 14 800 12100 12 100/3 720 51 05/08!01 P 26 04 14 20 000 036 45 30D 1 560 5 170 1 850 9 490 6 900 6 900/4 930 0 31 07120/01 P 2749 1564 ' 0 01 144 Not sampled 0 D1 ft LPH present 10122/01 P 2893 1708 ' 0 01 1 41 Not sampled 0 01 ft LPH present Of/15/02 — — -- — Not sampled well dry 04111102 NP 2788 16 04 0 DO 104 87 000 5200 16 000 3 900 20 000 20 DOD 19 000 3 0 07112102 NP 2898 1714 0 OD 110 85 DOO 4 100 8 900 3 700 18 ODO 13 000 15 000 22 11120102 — — — — Not sampled well dry I SProlectsIARCO149321TablesQIVIR Tables=05 gwtables4932 As Page 4 of 7