Laserfiche WebLink
casing elevations, representing an average increase in the water table elevation of approximately <br /> 0 53 feet since April 1996 The water level data were used to develop the groundwater elevation <br /> contour map (Figure 2) Assuming that horizontal isotropic conditions prevail, groundwater in <br /> the uppermost aquifer beneath the site flowed towards the southeast with a slight mounding effect <br /> noted in the vicinity of well MW-2 The average hydraulic gradient on July 10, 1996 was calculated <br /> to be 0 009 ft/ft or approximately 47 ft/mile A summary of groundwater monitoring data is <br /> presented in Table 1 <br /> CONCLUSIONS <br /> Petroleum hydrocarbon constituents remained detectable in the groundwater samples collected <br /> from wells MW-3 and MW-6 Concentrations of petroleum hydrocarbon constituents increased <br /> in well MW-3 since the last monitoring episode in April 1996 and were similar to the last quarter <br /> results in well MW-6 <br /> The direction of groundwater flow and the magnitude of hydraulic gradient are consistent with the <br /> previous quarter Groundwater elevations have risen due to seasonal conditions <br /> RECOMMENDATIONS <br /> Based on the results of the third quarter 1996 monitoring episode, we recommend the following <br />• o Continued quarterly monitoring of depth to water in all wells on site <br /> o Continued quarterly sampling of wells MW-3, and MW-6 and semiannual sampling of <br /> wells MW-1, MW-2, MW-4 and MW-5 <br /> Please contact our office at 209 579-2221 if you have any questions or comments <br /> Respectfully Submitted, <br /> Smith Environmental Technologies Corporation <br /> William Madison �� "r <br /> J3"'0"� <br /> Staff GeologistJZA;J , <br /> NE <br /> /17�� �a��"'1Q-- <br /> Jeanne Homsey, N y0 -r ' <br /> CA Registered Civil Engineer No 47410 1: Exp <br /> cc Gerald Thiemann �' ;rt CIVIL <br /> Elizabeth Thayer, RWQCB <br /> is <br /> W W43731quaztl0gr-1996 dM 3 <br /> • <br /> SMTH <br />