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1 <br /> 16 C$06 01 ?reC`lil*S 19C. <br /> ' 1 10 1 7ih street <br /> Modesto.Calitomia 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> 1 <br /> REPORT <br /> Groundwater Monitoring <br /> ' 1" Quarter 2005 <br /> ' George's Service <br /> 1600 Durham Ferry Road <br /> Tracy, California <br /> ' Project No. 425.2 <br /> March 21, 2005 <br /> i <br /> MEXECUTIVE SUMMARY <br /> This report summarizes the 1s' Quarter 2005 groundwater monitoring and sampling event that <br /> was completed on January 21, 2005. <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. <br /> These four zones are defined below, with the following general characteristic: <br /> i 1. Zone A — the water table wells with screen intervals from 5 to 22-feet bgs, have a <br /> gradient of 0.0011 ft/ft flowing N00°E. <br /> 2. Zone B wells - screened from 32 to 35-feet bgs, has groundwater gradient in of <br /> i 0.0043 ft/ft flowing N45°W. <br /> 3. Zones C & D - do not have three wells spaced properly to allow for gradient <br /> calculations, so site-specific groundwater gradients and bearings could not be <br /> icalculated for these two horizons. <br /> 4. The vertical component of groundwater flow is predominantly in the upward <br /> direction. <br /> iThe analytical results from the January 2005 monitoring event show that MTBE and/or TPH- <br /> G and BTEX constituents are present in 5 monitoring wells (MW-I, MW-2, MW-4, MW-5 <br /> i <br />