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1 7 <br /> Geofogica(Technics Inc. <br />' 2741 RiverR,oad <br /> Modesto,Carifamia 95351 <br /> (209)538-6424YY2K#538-5852 <br /> REPORT <br /> Sinclair Trucking <br /> 3780 West Linne Road <br />' Tracy, California <br /> Project No. 320.2 <br /> February 11, 2000 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 4' Quarter 1999 groundwater monitoring and testing that took <br />' place on December 20, 1999. During this monitoring event, four monitoring wells and one <br /> domestic well were sampled and tested. <br /> A summary of findings include: <br /> 1. Hydrogeology <br /> • Groundwater gradient and bearing were calculated and found to be 0.0038 ft/ft at <br /> N43°E. <br />' • For the last three years,the shallow groundwater gradient has moved towards the NE. <br /> 2. Groundwater Contamination <br /> • Floating product has not been detected. <br />' • Low concentrations of aromatic hydrocarbon compounds (BTEX) are present in MW- <br /> 1 while only trace concentrations were found in MW-4. Concentrations in both wells <br /> showed a slight increase this quarter. <br /> • None of the oxygenated fuel compounds (OFCs) were detected in any of the wells. <br />' • MW-2 & 3 water samples did not contain any of the petroleum hydrocarbon <br /> compounds tested for. <br /> • The domestic water well sample did not contain any of the chemicals tested for. <br />' The following conclusions are drawn from the data generated to date on this project: <br /> 1. Both the soil and groundwater environments in the vicinity of the former UST are <br />' impacted by gasoline. <br /> 2. Elevated concentrations of contamination extend downgradient in the sand unit between <br /> 12 to 16 feet below ground surface. <br /> 3. MW-2 & 3 and the domestic well continue to be free of contamination. <br />' 4.. MW-1 &MW-4 contain low concentrations of contamination. <br /> 5. MTBE and the other oxygenated fuel compounds were not detected for a third time. <br />