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VrA <br /> 1117 Lone Palm <br /> Avenue, Suite B <br /> Asao CIA r EE IN clrYr+; Modesto, CA 953511 <br /> flr'Tkr !(LAI-1(I WWW.atc-enviro.com <br /> .._ 209.579. <br /> Fax 209.579.2225 <br /> 03 DEC 18 PM 12t 32 <br /> December 16, 2003 <br /> 54.62580.0001 <br /> �`.� � / ' � moi, ,• <br /> Y t <br /> r.� <br /> Mr. Michael Huskins <br /> Advanced Technology Interconnect, Inc. <br /> C/o Advanced Interconnect Technologies <br /> 6800 Koll Center Parkway, Suite 220 <br /> Pleasanton, California, 94566 <br /> Subject: Serm-Almual Self-Monitoring Report, Third Quarter 2003 Groundwater <br /> Monitoring at 555 Carnegie Street, Manteca, California <br /> Dear Mr. Huskins: <br /> ATC associates Inc. is pleased to provide Advanced Interconnect Technologies with the results <br /> of the groundwater monito ng conducted at the above referenced site (Figure 1). The semi- <br /> annual monitoring was perbrmed 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 direcdonmd the hydraulic gradient in the uppermost aquifer. Sampling was <br /> performed to monitor the diaribution of priority pollutant metals in groundwater. <br /> DEPTH TO WATER MEASUREMENTS <br /> ATC Associates performed the depth-to-water measurements on November 11, 2003. Field <br /> work during this event consisted of measuring depth-to-water and collecting groundwater <br /> samples from the three existing monitoring wells, MW-1, MW-2, and MW-3. Field notes are <br /> contained in Attachment 1. <br /> ATC compiled groundwater gradient data from November 11, 2003 to provide an indication of <br /> the direction of groundwater flow in the vicinity of the site. Top of casing elevations and depth- <br /> to-water measurements were used to calculate the elevation of groundwater in each well. Water <br /> levels ranged from 20.21 to 21.98 feet below the tops of the well casing elevations, representing <br /> an average decrease in the water table elevation of approximately 3.59 feet since March 21, 2003. <br /> The water level data were used to develop the groundwater elevation contour map (Figure 2). <br /> 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 0.005 ft/ft or <br /> approximately 24 feet per mile. This is consistent with previous monitoring events. Groundwater <br /> data are presented in Tabte 1. <br /> ��tagao�.ao� t <br /> EPNIRONI�NTp�,GEOTECHNICAL AND MATBi W PROFESSIONALS <br />