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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2014-0006 -12-
<br /> FORWARD INC.AND REPUBLIC SERVICES INC.
<br /> FORWARD CLASS II LANDFILL
<br /> SAN JOAQUIN COUNTY
<br /> 45.In 2007, the Discharger submitted a detailed re-evaluation of historic groundwater levels for
<br /> the area east of WMU FU-06. The report demonstrated that proposed LCRS base grades in
<br /> the area east of WMU FU-06 are at least five feet above the historic high groundwater level.
<br /> 46.Monitoring data indicate background groundwater quality for first encountered groundwater
<br /> has electrical conductivity (EC) ranging between 900 and 1100 micromhos/cm, with total
<br /> dissolved solids (TDS) ranging between 600 and 800 milligrams per liter (mg/L).
<br /> 47.The direction of groundwater flow is generally toward the north-northeast. The estimated
<br /> average groundwater gradient is approximately 0.002 feet per foot. The estimated average
<br /> groundwater velocity is 195 feet per year.
<br /> 48.The designated beneficial uses of the groundwater, as specified in the Basin Plan, are
<br /> domestic and municipal water supply, agricultural supply, industrial service supply, and
<br /> industrial process supply.
<br /> GROUNDWATER AND UNSATURATED ZONE MONITORING
<br /> 49.The existing groundwater monitoring network consists of two units, the Forward Unit with a
<br /> detection program and the Austin Road Unit with a detection program, a corrective action
<br /> program and an ongoing evaluation program. The groundwater monitoring network is
<br /> summarized in the following:
<br /> Unit Status Wells
<br /> Forward Background MW-22, MW-23R, MW-24
<br /> Detection MW-1A, -2A, -3A, -10, -13A, -14A, -15, -16, -
<br /> 17, -18, -19, &-21
<br /> Domestic DW-9690
<br /> Austin Road Background AMW-2
<br /> Shallow Zone
<br /> Detection AMW-5R & -12
<br /> Corrective AMW-1, -4, -10, -11, -13, -14, -18, -19, -21 S,
<br /> Action -22S, -24SR, -29S, -30-S, -31 S & -32S
<br /> Austin Road
<br /> Deep Zone
<br /> Detection AMW-6 & -7
<br /> Corrective/ AMW-13B, -18B, -19BR, -21 , -22, -24R, -25,
<br /> Evaluation -26R, -28, -29, -30, -31, & -32
<br /> Domestic 7898-A, 8106-A
<br /> 50.Any additional groundwater wells installed as part of an investigation or for any other reason
<br /> shall be sampled quarterly for the parameters and constituents listed in Table I of the MRP
<br /> until they are either abandoned with concurrence of Water Board staff or they are
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