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<br />, <br /> <br />, <br /> <br />, <br /> <br />American Diversion Dam and has a capacity of 40 mgd. The Jonathan Rogers Treatment Plant <br />started operation in 1993; it is located between the Rio Grande and the Riverside Canal <br />immediately downstream of the Riverside Diversion Dam and has a capacity of 40 mgd, but is <br />proposed to be upgraded to 60 mgd. Waste water is treated at four treatment plants. Two of <br />these treatment plants (the Northwest and the Haskell) discharge to the river, one (the <br />Bustemonte) discharges to either the Riverside Canal or to the river. Effluent from the fourth <br />(the Northeast) is injected into the Hueco bolson. <br /> <br />Rio Grande Project water is acquired by the City of EI Paso through the ownership of <br />lands, leases, and contractual arrangements with property owners and EPCWlD. The City is <br />able to obtain water from EPCWID in an exchange. The City discharges treated waste water <br />from the Bustemonte treatment plant into the Riverside Canal and can then take up to one-half <br />of this amount from the Canal. <br /> <br />As for the Mesilla Valley, the flood-plain alluvium and the deposits of the Santa Fe Group <br />in the Hueco Basin are the two major aquifers in the EI Paso Valley. The flood-plain alluvium <br />overlays the deposits of the Santa Fe Group. It consists of up to 200 feet of sand gravel, gravel, <br />clay and silt Wells completed in the flood-plain alluvium yield from 25 to 3,000 gpm. <br />Concentrations of total dissolved solids are generally less than 2,000 mg/l near the river but <br />increase further from the river (Estepp, 1990, p. 7). <br /> <br />The Hueco bolson is located between the Franklin Mountains on the west and the Hueco <br />Mountains on the east and, therefore, exists through most of the EI Paso Valley. It extends <br />northward to the Tularosa basin in New Mexico and southward into Mexico. These deposits <br />consist of interbedded sand, gravel, clay, and silt. These deposits are less than 100 feet thick <br />near the Franklin Mountains, increase to a maximum of 9,000 feet thick about 4 miles east of <br />the Franklin Mountains, and then decrease to about 500 feet thick 13 miles further east <br />Ground water occurs in these deposits under water-table conditions in the mesa part of the <br />bolson, which extends from the escarpment at the northern edge of the valley northward into <br />New Mexico. South of the mesa, the ground water occurs under artesian conditions (Meyer, <br />1976, p. 5). The concentrations of total dissolved solids in these bolson depositions are <br />generally less than 1,000 mgll (Estepp, 1990, p. -l. The bolson deposits are recharged <br /> <br />2 -18 <br /> <br />(;C C~D <br />