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, ,A <br /> A S S O C I A 7 E S I N. C-. <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements-were collected from monitoring wells MW1, MW2, and MW3 on <br /> June 6, 2001. Water level elevations ranged from 38.10 to 38.20, representing an average <br /> decrease in water table elevation of approximately 0.81 feet since March 2001. The water level <br /> data were used to develop the groundwater elevation contour map (Figure 3). Assuming that <br /> horizontal isotropic conditions prevail, groundwater in the uppermost aquifer beneath the site <br /> 1 flowed towards the northeast. The average hydraulic gradient on June 6, 2001 was calculated to <br /> be 0.002 or approximately 10.6 ft/mile. A summary of groundwater monitoring data is presented <br /> in Table 1. <br /> CONCLUSIONS <br /> Groundwater flow direction and gradient is consistent with previous sampling events. Water <br /> table elevations have decreased slightly since the March 2001 monitoring event. Groundwater <br /> analytical results remained within historical parameters as set by previous groundwater analytical <br /> results. <br /> RECOMMENDATIONS <br /> Based on the results of the second quarter 2001 .monitoring event, we recommend continued <br /> quarterly groundwater monitoring with analysis of samples for TPHg and BTEX. <br /> 'Additionally, ATC is currently obtaining encroachment permits from the City of Ripon and will <br /> perform a subsurface investigation on .September 12, 2001 in accordance with our workplan <br /> previously approved by PHS/EHD. <br /> Please contact our office at(209) 579-2221 if you have any questions or comments. <br /> Respectfully submitted, <br /> ATC Associates Inc. <br /> (;Vkt <`` c� <br /> An Sellman <br /> .Staff Geologist 1 � <br /> Jeanne Homsey, P.E. <br /> 74 1 <br /> CA Registered Civil Engineer No. 47410 <br /> cc: Mr. Paul Van Dyken Sr N & S Irrigation <br /> Marty Hartzell, RWQCBr W <br /> w:Iwordpro1149811Reports\2QR-o l.doc 3 <br />