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1117 Lone Palm Avenue, Suite B <br /> (:v <br /> Modesto, CA 95351 <br /> - ._. • www.atc-enviro.com <br /> 209.579.2221 <br /> A S 8 0 C I A T E 8 I N C . <br /> r�� '!�C"I`dENtAi. tiEAL1N Fax 209.579.2225 <br /> "TH11 SFRVIC€ <br /> 03 JUL -9 AM 10= 46 <br /> July 7, 2003 <br /> 54.62580.0001 <br /> Mr. Jim Cook <br /> Advanced Interconnect Technologies <br /> 555 Carnegie Street <br /> Manteca, California, 95336 <br /> Subject: Groundwater Monitoring at 555 Carnegie Street, Manteca, CA <br /> Dear Mr. Cook: <br /> ATC Associates Inc. is pleased to provide Advanced Interconnect Technologies with the results <br /> of the groundwater monitoring conducted at the above referenced site (Figure 1). The semi- <br /> annual monitoring was performed as part of a self-monitoring program initiated by Advanced <br /> Interconnect Technologies in June 1995. Monitoring was performed to determine the <br /> groundwater flow direction and the hydraulic gradient in the uppermost aquifer. <br /> DEPTH TO WATER MEASUREMENTS <br /> ATC Associates performed the depth-to-water measurements on March 21, 2003. Fieldwork <br /> during this event consisted of measuring depth-to-water from the three existing monitoring wells, <br /> MW-1, MW-2, and MW-3. Field notes are contained in Attachment 1. <br /> ATC compiled groundwater gradient data from March 21, 2003 to provide an indication of the <br /> direction of groundwater flow in the vicinity of the site. Top of casing elevations and depth-to- <br /> water measurements were used to calculate the elevation of groundwater in each well. Water <br /> levels ranged from 17.05 to 18.17 feet below the tops of the well casing elevations, representing <br /> an average increase in the water table elevation of approximately 2.85 feet since September 20, <br /> 2002. The water level data were used to develop the groundwater elevation contour map (Figure <br /> 2). Assuming that horizontal isotropic conditions prevail, groundwater in the uppermost aquifer <br /> beneath the site flowed generally towards the north with a hydraulic gradient of 0.002 fl/fl or <br /> approximately 12 feet per mile. This is consistent with previous monitoring events. Groundwater <br /> data are presented in Table 1. <br /> During this monitoring event, the wells were found to be in good condition with no visible <br /> defects. The next scheduled activities are in September 2003 and include depth to groundwater <br /> w162580Veports\1 STQTR03.doc <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />