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PURPOSE AND SCOPE <br /> The following report documents the Over-excavation of gasoline contaminated soils and <br /> discusses the findings Also included with this report are the results of the 'Pump Test" <br /> THA E LINE <br /> January 6, 2003 Well MW I destroyed <br /> January 7, 2003 Temporary Piezometers PZ1A, PZ1B, PZ2A and PZ2B <br /> installed <br /> January 13-17, 2003 Background measurements of groundwater conditions <br /> January 17, 2003 Delivery of 21,000 gallon Baker Tank and 4 water carbon <br /> units <br /> January 2025, 2003 Pump test <br /> January 31, 2003 Groundwater Sampled from all existing Sanchez wells <br /> February 4, 2003 Started discharge to sewer, water stored in 21,000 gallon <br /> capacity Baker tank from pump test and quarterly <br /> samplings <br /> February 5, 2003 URSA constructed impound for holding excavated <br /> contaminated soils and sludge <br /> (� February 6, 2003 URSA removed surface of area to be excavated, readied <br /> area for excavating Started dewatering area to be over- <br /> excavated, using well RIB Startrd excavation of over- <br /> burden to expose contaminated soil Exposed area of <br /> hydrocarbon tainted soils at 10 foot depth <br /> February 7, 2003 Excavated to 14 feet near temporary piezometers PZ 1 A and <br /> PZ2A, removed piezometers PZ1A and PZ2A by pulling <br /> casing, and cement seal <br /> February 10, 2003 URSA built ramp for excavator to access excavation for <br /> deep digging Controller for dewatering pump in well RIB <br /> was modified to enable it to continuously pump without <br /> supervision <br /> February 14, 2003 Postponed further excavating until February 25, 2003 <br /> Weather service predicted severe storms for week of <br /> February 18 - 21, 2003 <br /> February 25, 2003 Started over-excavation of area to install dewatering trench <br /> Placed dewatering PVC into dewatering trench, <br /> approximately 30 foot depth Moved pump from RIB well <br /> to PVC in dewatering trench Over-excavated and removed <br /> PZ2B <br /> February 28, 2003 Finished over-excavation, over-excavated and removed <br /> PZIB, RIA and RIB wells Bottom of excavation 28-30 <br /> feet below surface at wells, 24 to 20 feet below surface east <br /> 4 Update Status March 2003 <br />