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c7colo `icst recti ics kc. <br /> ' 1101 7a'Street <br /> Modesto,California 95354 <br /> (209)522-41191 Fax(209)522-4227 <br /> ' REPORT <br /> Groundwater Monitoring <br /> 4 h Quarter 2004 <br /> ' George's Service <br /> 1600 Durham Ferry Road <br /> Tracy, California <br /> ' Project No. 425.2 <br /> February 22, 2005 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 4h Quarter 2004 groundwater monitoring and sampling event that <br /> was completed on November 03,2004. <br /> As described in Monitoring report for third quarter of 2005, to further evaluate aquifer <br /> characteristics and behavior at the site, the aquifer was divided into four zones.- This division <br /> is based on well screen intervals and seemed to lend a more complete understanding of <br /> ' groundwater gradients. These four zones are defined below, with the general characteristic. <br /> 1. The water table wells, screened from 5 to 22-feet bgs, make up Zone A and have a <br /> gradient of 0.0001 ft/ft flowing N22�E. Depth to groundwater in the Zone A ranged <br /> between 12.45 and 13.44 feet below ground surface (bgs). <br /> 2. The groundwater gradient in the Zone B wells, screened from 32 to 35-feet bgs, was <br /> 0.0033 ft/ft flowing N73°W. <br /> ' 3. Site-specific groundwater gradients and bearings could not be calculated in the Zones <br /> C & D, since these two horizons do not have three wells spaced properly to allow for <br /> gradient calculations. <br /> ' The vertical component of groundwater flow is usually in the upward direction. <br /> i The analytical results from the November 2004, monitoring event show that MTBE and/or <br /> TPH-G and BTEX constituents are present in 7 monitoring wells (MW-1, MW-2, MW-3, <br /> 1 <br />