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amec <br /> TABLE OF CONTENTS <br /> (Continued) <br /> Neenah Paper Company Industrial Supply Wells .................................33 <br /> Nestle Groundwater Extraction Wells....................................................34 <br /> 4.4 AQUIFER PROPERTIES AND GROUNDWATER FLOW...............................................34 <br /> 4.4.1 Upper Aquifer........................................................................................34 <br /> B-Zone Groundwater Flow System .......................................................35 <br /> A-Zone Groundwater Flow System .......................................................36 <br /> 4.4.2 Intermediate Aquifer..............................................................................36 <br /> C1-Zone and C2-Zone Groundwater Flow Systems .............................37 <br /> 4.4.3 Corcoran Clay .......................................................................................37 <br /> 4.4.4 Lower Aquifer........................................................................................37 <br /> 4.5 HISTORICAL CONTROLS ON GROUNDWATER FLOW ..............................................38 <br /> 4.5.1 Groundwater Pumping (1957 — 1986).......................................38 <br /> 4.5.2 Groundwater Recharge (1957 — 1986)......................................39 <br /> Recharge of Domestic and Industrial Water at the City Lagoons..........39 <br /> 4.5.3 Historical Groundwater Flow Regimes..................................................40 <br /> July2006...............................................................................................40 <br /> January2006.........................................................................................41 <br /> July2004...............................................................................................41 <br /> January2004.........................................................................................41 <br /> April1997..............................................................................................41 <br /> October1996.........................................................................................42 <br /> January1996.........................................................................................42 <br /> June1992..............................................................................................42 <br /> March1992 ...........................................................................................42 <br /> July1990...............................................................................................42 <br /> January1990.........................................................................................43 <br /> Estimated Groundwater Flow Direction in 1974-1985...........................43 <br /> Estimated Groundwater Flow Direction in 1966-1974...........................43 <br /> Estimated Groundwater Flow Direction in 1957-1966...........................43 <br /> 4.6 SPATIAL AND TEMPORAL DISTRIBUTION OF COCS ...............................................44 <br /> 4.6.1 Upper Aquifer— B-Zone Wells...............................................................44 <br /> 4.6.2 Upper Aquifer—A-Zone Wells...............................................................45 <br /> 4.6.3 Intermediate Aquifer— C-Zone Wells ....................................................45 <br /> 4.6.4 Lower Aquifer— D-Zone Wells ..............................................................47 <br /> 4.6.5 COC Impacts to Groundwater near the Stanislaus River......................48 <br /> 4.6.6 Timing and Location of Offsite TCE Releases ......................................49 <br /> SewerLeaks..........................................................................................49 <br /> Direct Infiltration of Untreated Industrial Wastewater at the WWTF <br /> Lagoons.................................................................................................50 <br /> Direct Discharge of Untreated Industrial Wastewater to the Stanislaus ... <br /> River ...................................................................................................50 <br /> 4.6.7 Historical Migration of CDCs in Groundwater from Offsite Sources......50 <br /> 4.7 IMPLICATIONS.....................................................................................................52 <br /> 5.0 MAJOR CONCLUSIONS AND IMPLICATIONS OF THIS SCM UPDATE ...................53 <br /> AMEC Geomatrix, Inc. <br /> I:\Doc_Safe\9000s\9837.005\4000 REGULATORY\SCM_01.30.09\1_text\SCM Report Final.doc II <br />