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Ceolo icAl rechal" 11tc. <br /> ' <br /> 11017"Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> ' REPORT <br /> Groundwater Monitoring <br /> ' 3"d Quarter 2004 <br /> George's Service <br /> 1600 Durham Ferry Road <br /> Tracy, California <br /> ' Project No. 425.2 <br /> October 19, 2004 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 3rd Quarter 2004 groundwater monitoring and sampling event that <br /> ' was completed on July 23, 2004. <br /> ' To further evaluate aquifer characteristics and behavior at the site, the aquifer was divided <br /> into four zones. This division is based on well screen intervals and seemed to lend a more <br /> complete understanding of groundwater gradients. These four zones are defined below, with <br /> ' 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 0.0015 ft/ft flowing NO3�E. Depth to groundwater in the Zone A ranged <br /> ' between 12.22 and 13.35 feet below ground surface (bgs). <br /> 2. The groundwater gradient in the Zone B wells, screened from 32 to 35-feet bgs, was <br /> 0.0022 ft/ft flowing N61°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 <br /> component of groundwater flow is usually in the upward direction. <br /> p <br /> ' The analytical results from the July 2004, monitoring event show that aromatic hydrocarbon <br /> compounds (BTEX) and gasoline range petroleum hydrocarbons (TPH-G) are present in 5 <br />