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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 />
<br />
<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 />
<br />Austin Road
<br />Shallow Zone
<br />
<br />Background
<br />
<br />AMW -2
<br /> Detection AMW -5R & -12
<br /> Corrective
<br />Action
<br />AMW -1, -4, -10, -11, -13, -14, -18, -19, -21S,
<br />-22S, -24SR, -29S, -30-S, -31S & -32S
<br />
<br />Austin Road
<br />Deep Zone
<br />
<br /> Detection AMW -6 & -7
<br /> Corrective/
<br />Evaluation
<br />AMW -13B, -18B, -19BR, -21, -22, -24R, -25,
<br />-26R, -28, -29, -30, -31, & -32
<br /> Domestic 7898-A, 8106-A
<br />
<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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