ARCHIVED REPORTS_ANNUAL 2010 GROUNDWATER MONITORING AND SAMPLING REPORT

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TABLE 6 SUMMARY OF WELL CONSTRUCTION DETAILS ALDEN PARK Tracy,California GSE TOC Total Casing Casing Screen Screen Sand Transition Well Range of Well Date (ft above (ft above Depth Length Diameter Interval Length Interval Sean Seal DTWt ID Installed MSL) MSL) (ft) (ft) (in) (ft) (ft) (ft) (ft) (ft) (btoc) MW-11KJC 08/30/86 --- 47.78 --- ---- 4 ---- ---- ---- 7- 10 MWA 2 04/06/87 ---- -- ---- 19 4 4- 19 15 3 MW-22 04/07/87 ---- 55.40 ---- 21.5 4 6.5-21.5 15 ---- _--- ---- 10- 14 MW-32 04/08/87 ---- ---- ---- 22 4 7-22 153 ---- ---- --- ---- MW-42 04/09/87 ---- 51.80 ---- 20 4 5-20 15 ---- ---- 8- 12 MW-52 04/10/87 ---- 51.02 -- 22 4 7-22 15 -- ---- 8- 13 MW-64 04/13/87 ---- ---- ---- 22 4 7-22 15 ---- ---- ---- ---- _ 3 MW-74 04/14/87 ---- 50.12 ---- 20 4 5-20 15 --- ---- ---- 8- 12 MW-84 04/15/87 ---- 50.65 ---- 19.5 4 4.5- 19.5 15 ---- ---- MW-9404/16/87 ---- 53.1.1 --- 20 4 5-20 15 ---- ---- - 9- 13 MW-104 04/11/87 ---- 51.66 ---- 20 4 5-20 15 ---- ---- ---- 9- 13 MW-114 04/27187 55.8 55.09 22 22 4 7.0-22 15 6.0-22 4.0-6,0 1.0-4.0 10- 14 MW-124 04/27/87 54.3 53.67 20 20 4 5.0-20 15 4.0-20 3.0-4.0 1.0-3.0 8- 12 MW-134 04/28/87 55.5 54.87 20 20 4 5.0-20 15 4.0-20 3.0-4.0 1.0-3.0 11 - 15 MW-144 04/28/87 55.1 54.17 20 19 4 4.0- 19 15 3.5- 19 3.0-3.5 1.0-3.0 10- 13 MW-154 05/12/87 55.0 ---- 20.5 20.5 4 8-0-20.5 12.5 6.5-20.5 5.5-6.5 1.0-5.5 3 MW-164 05/18187 . 55.0 ---- 20 20 4 7.5-20 12.5 6.5-20.5 5-5-6.5 1.0-5.5 3 MW-174 05/18/97 54.9 54.41 20 20 4 5,0-20 15 4.0-20 3.0-4.0 1.0-3.0 9- 10 MW_18 5 04/13196 ---- 52.18 23.5 21 A 4 7.0-21A 14.4 6,0-23.5 4.0-6.0 1.0-4.0 3 MW-195 04/10/96 ---- 52.82 23.5 19.5 4 5.0- 19.4 14.4 4.0-23.5 2,0-4.0 1.0-2.0 8- 10 MW-205 04/13/96 ---- 55.17 26 1 24.4 4 10-24.4 1 14.4 8.5-26 5.5-8.5 1.0-5.5 3 MW-215 04/13/96 ---- 55.04 23 20.4 4 6.0-20.4 14.4 5.0-23 3.0-5.0 1.0-3.0 4- 14 Abbreviations: Abbreviations(cont.): btoc=Below top of casing TOC=Top-of-casing elevation in feet relative to MSL DTW=Depth to water =Unavailable/not applicable ft=Feet GSE=Ground surface elevation in feet relative to mean sea level Notes: ID=Identification 1.Approximate range of depth to water since 1996. in=Inches 2.Well details from search of Chevron files on October 17,2003,performed by SAIC. MSL=Mean sea level 3.SPO measured since April 1997. MW=Monitoring well 4.Well construction details summarized from Dames&Moore boring logs. SAIC=Science Applications International Corporation 5.Well construction details summarized from Geomatrix boring logs. SPO=Separate-phase oil AIThe Denham Compeniaa,LLC `• "'Wholly Owned Subtl0ary Page 1 of 1 fomurenON to sorulrows