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Table 3 Liquid Surface Elevation Data South Shore Parcels - Parcel 2A and Adjacent Areas West Weber Avenue and North Lincoln Street Stockton, California Elevation of Depth to Water Depth to SPH Groundwater Separate Phase TOC From TOC From TOC Elevation Hydrocarbon Name Date (feet MSL) (feet) (feet) (feet MSL) (Thickness in Feet) Mormon Slough (cont.) MS (cont.) 1/24/11 8.51 --- 3.33 --- 4/18/11 9.50 --- 2.34 --- 7/18/11 9.58 --- 2.26 --- 10/17/11 8.80 --- 3.04 --- 1/17/12 8.98 --- 2.86 --- Explanations: TOC = Top of Casing SPH = Separate-Phase Hydrocarbons MSL = Mean Sea Level MTS = Mobile Treatment System NM = Not measured --- = Not Applicable MS = Mormon Slough Survey Point 1 MW-5, MW-10, and MW-11 were damaged and could not be sampled in May 2002. 2 Thickness of SPH not recorded at 2AMW-14 and DPE-4 due to coating of probe with product (Clayton Group Services, Quarterly Monitoring Report and Annual Report , February 1, 2003); therefore depth to liquid elevation was not corrected for the presence of SPH. 3 Well gauged prior to the first quarter 2003 monitoring event before commencement of dual-phase extraction by MTS. 4 SPH was too thick to read DTW. 5 Unable to measure DTW; SPH thickness greater than length of bailer (3 feet in length). 6 Unable to measure DTW due to emulsified SPH. 7 Well buried due to grading associated with construction. 8 Well sampled and gauged, but not applicable to report because well was destroyed and reinstalled and needs to be resurveyed, well gauging data not applicable. 9 Well converted to flush mount and resurveyed by Morrow Surveying on 12/5/06 10 Well resurveyed by Morrow Surveying on 12/5/05 11 Sheen detected after purge 12 Well converted to flush mount and resurveyed on March 21, 2007 13 Well surveyed March 21, 2007. Well was initially installed on March 22, 2006 for pilot testing and was added to quarterly monitoring activities during the first quarter 2007. 14 Wells re-surveyed April 9, 2007. 15 Wells surveyed by Stantec during the Fourth Quarter 2008. 16 Wells destroyed in November 2008 as part of the Unocal excavation activities by Treadwell and Rollo. 17 Well inaccessible during 2008 survey. 18 Well MW-06R reinstalled in close proximity to MW-6 by Wallace-Kuhl in November 2008. 19 Unable to access monument. Groundwater elevation corrected for the presence of SPH; density of SPH assumed to be 0.86 g/mL. Density of H20 (1.0 g/mL) minus density of SPH (0.86 g/mL) equals multiplier factor of 0.14. I:\Tidewater\TW Stockton (P2A)\Tables\QMR Tables\2012\1Q12\20120305-Parcel2A (Table 3) Historical Water Levels 1Q12-CL.xlsx Page 57 of 57