ARCHIVED REPORTS_GROUNDWATER MONITORING REPORT 4TH QUARTER 2010

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TABLE Page 7of9 WELL CONCENTRATIONS 4Q10 FORMER SHELL CENTRAL VALLEY CRUDE OIL PIPELINES NEIGHBORHOODS BCD MOUNTAIN HOUSE,CALIFORNIA TPHc TPHd Bercrene Toluene Ethylben. Xylenes Naphthalene Sulfate Sulfur TOC WL Depth WL Ekv VL up/1, u82 og/t ag/L ug2 u&L mgt ing/L ftAMSL ftAMSL ftAMSL Neighbourhood B MW-9(C&D, 9/21/2009 - - - - - - - _ - 99.4 34.24 65.16 MW-9(C&D; 9/30/2009 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 190 67.0 99.4 35.36 64.04 MW-9(C&D;12/29/2009 - - - - - - - - 99.4 34.4 65 MW-9(C&D;12/30/2009 <250 <50 <OSO <1.0 <1.0 <1.0 <10 - - - - - MW-9(C&D;3/25/2010 - _ _ _ - - - - - 99.4 34.6 64.8 MW-9(C&D;3/26/2010 <250 62 <050 <1.0 <1.0 <1.0 <10 - - - - - MW-9(C&D; 6/25/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 99.4 34.82 64.58 MW-9(C&D; 9/15/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 99.4 34.94 64.46 MW-9(C&D,12/23/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 99.4 35.02 64.38 VIW-30(C&D 9/21/2009 - - - - - - - - - 97.42 3273 64.69 AW-10(C&D 9/30/2009 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 220 78.8 97.42 3278 64.64 AW-10(C&D 12/29/2009 - - - - - - - - - 97.42 32.87 64.55 vIW-10(C&D 12/30/2009 <250 <50 <050 <1.0 <1.0 <1.0 <10 - - - - - vfW-10(C&D 3/25/2010 - - - - - - - - - 97.42 _ _ ,IW-10(C&D 6/25/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 97.42 3329 64.13 v1W-10(C&D 9/15/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 97.42 3328 64.14 AW-10(C&D 12/23/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 97.42 33.37 MOS v1W-11(C&D 9/21/2009 - - - - - - - - - 99.74 33.31 66.430 <0 AW-11(C&D 9/30/2009 <250 <5 .50 <1.0 <1.0 <1.0 <10 1211 49.1 99.74 33.47 6627 %4W-11(C&D 12/29/2009 - - - - - - - - - 99.74 33AI 66.33 0 <0 ,4W-11(C&D 12/30/2009 <250 <5 .50 <1.0 <1.0 <1.0 <10 - - - - - AW-11(C&D 3/25/2010 - - - - - - - - - 99.74 34.9 64.84 0 <0 NW-11(C&D 3/26/2010 <250 <5 .50 <1.0 <1.0 <1.0 <10 - - - - - AW-11(C&D 6/25/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 99.74 34.15 65.59 v1W-II(C&D 9/15/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 99.74 34.02 65.72 OW-11(C&D 12/23/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 99.74 33.69 66.05 ,4W-12(C&D 9/21/2009 - - - - - - - - - 95.9 2991 66.09 %IW-12(C&D 9/30/2009 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 160 59.7 95.9 29.8 66.1 vlW-12(C&D 12/29/2009 - - - - - - _ - - 95.9 29.91 65.99 dW-12(C&D 12/30/2009 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - - - - v1W-12(C&D 3/25/2010 - - - - - - - - 95.9 30.55 65.35 0 <050 < vIW-12(C&D 3/26/2010 <250 <5 . 1.0 <1.0 <1.0 <10 - - - - - AW-12(C&D 6/25/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 95.9 31.02 6498 VIW-12(C&D 9/15/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 95.9 30.42 65.48 dW-12(C&D 12/23/2010 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 - - 95.9 30.25 65.65 AW-13(C&D 9/21/2009 - - - - - - - _ - 94.86 28.2 66.66 dW-13(C&D 9/30/2009 <250 <50 <0.50 <1.0 <1.0 <1.0 <10 65 37.6 94.86 28.12 66.74 4 W mn aa$avnmu.vr.xc s�piw.w®yup