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<br />no <br /> <br />East Mesa Area, California <br /> <br />A cursory revie1" of available information provides the <br />basis for the following conclusions: <br /> <br />1. Fresh gronnd1,ater occurs in the alluvial and deltaic sand, <br />gravel, and si'lt which is overlain by aeolian sands. The <br />several U. S. Geological Survey test wells indicate that <br />usable groundwater occurs at depths greater than 1,000 feet <br />below land surface in the southeastern half of East Nesa. <br />One test well was constructed to a depth of 2,600 feet <br />near the Coachella Canal junction 1>1 th the All-American <br />Canal. Hater containing 743 ppm (parts per million) TDS <br />(total di ssol ved solids) was encountered between 3110 and <br />520 feet below land surface. <br /> <br />2. A review of chemical analyses of ground1,ater obtained from <br />,,'ells along un east-west, 5 mile wide area, north of the <br />international boundary bet11een Pilot-ICnob and East llighline <br />Canal, indieates that the total dissolved solids are similar <br />to Colorado River 1'later. The summation of 25 samples reveals <br />an arithmetic average of less than 900 ppm TDS in the upper <br />part of the aquifer. In the lower part, from about 800 to <br />1.500 feet, the ,':ater qualJ.:ty be_c,o,me,s_pr.o.gr.essi.:v:.elY-IllOJ:e <br />saline and as much as 2,000 ppm TDS has been reported from <br />several wells. A review of water levels indieates a range <br />from about :30 to 50 feet below land surface, west of the <br />Algodones Sand Dunes; and about 150 to 180 feet in the San <br />Dunes area. <br />