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Table 4 <br /> Historic Liquid Surface Elevation Data <br /> South Shore Parcels- Parcel 2A and Adjacent Areas <br /> West Weber Avenue and North Lincoln Street <br /> Stockton, California <br /> Elevation of Depth to Water Depth to SPH Groundwater Separate Phase <br /> TOC From TOC From TOC Elevation Hydrocarbon <br /> Name Date (feet MSL) (feet) (feet) (feet MSL) (Thickness in Feet) <br /> Explanations: <br /> TOC=Top of Casing SPH=Separate-Phase Hydrocarbons <br /> MSL=Mean Sea Level MTS=Mobile Treatment System <br /> NM=Not measured ---=Not Applicable <br /> MS=Mormon Slough Survey Point <br /> 1 MW-5,MW-10,and MW-11 were damaged and could not be sampled in May 2002. <br /> 2 Thickness of SPH not recorded at 2AMW-14 due to coating of probe with product(Clayton Group Services,Quarterly Monitoring <br /> Report and Annual Report,February 1,2003);therefore depth to liquid elevation was not corrected for the presence of SPH. <br /> 3 Well gauged prior to the first quarter 2003 monitoring event before commencement of dual-phase extraction by MTS. <br /> 4 SPH was too thick to read DTW. <br /> 5 Unable to measure DTW; SPH thickness greater than length of bailer(3 feet in length). <br /> 6 Unable to measure DTW due to emulsified SPH. <br /> 7 Well buried due to grading associated with construction. <br /> 8 Well sampled and gauged,but not applicable to report because well was destroyed and reinstalled and needs to be <br /> resurveyed,well gauging data not applicable. <br /> 9 Well converted to flush mount and resurveyed by Morrow Surveying on 12/5/06 <br /> 10 Well resurveyed by Morrow Surveying on 12/5/05 <br /> 11 Sheen detected after purge <br /> Groundwater elevation corrected for the presence of SPH;density of SPH assumed to be 0.86 g/mL. Density of H2O(1.0 g/mL)minus <br /> density of SPH(0.86 g/mL)equals multiplier factor of 0.14. <br /> 12 Well converted to flush mount and resurveyed on March 21,2007 <br /> 13 Well surveyed March 21,2007.Well was initially installed on March 22,2006 for pilot testing and was added to quarterly <br /> monitoring activities during the first quarter 2007. <br /> 14 Wells re-surveyed April 9,2007. <br /> 15 Wells surveyed by Stantec during the Fourth Quarter 2008. <br /> 16 Wells destroyed in November 2008 as part of the Unocal excavation activities by Treadwell and Rollo. <br /> "Well inaccessible during 2008 survey. <br /> 18 Well MW-06R reinstalled in close proximity to MW-6 by Wallace-Kuhl in November 2008. <br /> 9 Unable to access monument. <br /> Page 59 of 59 <br />