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Cvv:ATC <br /> A S S O C I A T E S I N C <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from monitoring wells MWI, MW2, and MW3 on <br /> September 6, 2001 Water level elevations ranged from 36 10 to 36 21, representing an average <br /> decrease in water table elevation of approximately 2 0 feet since June 2001 The water level data <br /> 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 /> flowed towards the northeast The average hydraulic gradient on September 6, 2001 was <br /> calculated to be 0 001 or approximately 8 ft/mile A summary of groundwater monitoring data is <br /> presented in Table 1 <br /> CONCLUSIONS <br /> Groundwater flow direction and gradient is consistent with previous sampling events Water <br /> table elevations have decreased somewhat since the June 2001 monitoring event Groundwater <br /> analytical results show a general increase in concentrations, though most remained within <br /> historical parameters as set by previous groundwater analytical results <br /> RECOMMENDATIONS <br /> Based on the results of the third quarter 2001 monitoring event, we recommend continued <br /> quarterly groundwater monitoring with analysis of samples for TPHg, BTEX, and MTBE <br /> Please contact our office at(209) 579-2221 if you have any questions or comments <br /> Respectfully submitted, <br /> ATC A sociates Inc <br /> Jimundert <br /> Staff Geologist <br /> � � Z <br /> Jeanne Homs�, P k�Y <br /> CA Registered Civil Engineer No 47410 <br /> cc Mr Paul Van Dyken, Sr, N & S IrrigationA `� , <br /> Marty Hartzell RWQCB <br /> w lwordpro1149811Reportsl3QR-01 doe 3 <br />