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Figure 1-2 shows an aerial view and layout of the treatment plant. The W WTF is located on 150 acres <br /> and consists of:a headworks facility with a mechanical screen,screenings compactor,and flow <br /> measurement device;four mechanically aerated treatment ponds(Ponds T-1 through T-4);seven <br /> evaporation-percolation ponds(Ponds P-2 through P-8)and thirteen groundwater monitoring wells <br /> (MW-1 through MW-13). <br /> .... Mw-12 <br /> -; PROPOSED .e:S,;i'• ..\`\- a: <br /> NEW MW-5 p <br /> 50' WEST <br /> MW-5 PROPOSED FDR <br /> DESTRUCTION , <br /> `SII T,4 MW-13 <br /> MW-I .. �� <br /> p.1 1 <br /> 3 <br /> MW-1 t-T T.2',y� <br /> MW-9• F1Vly6 <br /> C Rn MW-11 MW-4 <br /> MW-8 MW_ Z �yT'. <br /> MW N L A U S R r L <br /> Figure 1-2: Facility Site Map <br /> 1.2 LOCAL GEOLOGIC AND HYDROGEOLOGIC CONDITIONS <br /> The WWTF is located in the fluvial deposits of the Stanislaus River. Information from available <br /> monitoring well boring logs suggest the soils under the treatment and percolation/evaporationponds are <br /> interbedded gravels,fine to medium sands, sandy silts,clayey silts and clays. To date,no known <br /> percolation tests have been performed on soils underlying the facility ponds. <br /> The wastewater facility is within 500 feet of the Stanislaus River and it is expected that local <br /> groundwater movement and elevation can be strongly influenced by the river stage. Regional <br /> groundwater elevations(spring 1988 San Joaquin County groundwater maps)tend to decrease away <br /> from the river with a gradient towards the west-northwest. The existing monitoring wells identified in <br /> July 2015 Conformed with 21 October 2015 Conditional Approval 2 MW-5 Replacement <br /> City of Riverbank WINT Monitodrg Well Installation Workpl2n <br />