Sources of arsenic in streams tributary to Lake Crowley, California

Water-Resources Investigations Report 76-36



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Lake Crowley is the largest single source of water for the city of Los Angeles. More than 50 percent of the water entering the Los Angeles-Owens River aqueduct flows through Lake Crowley. Arsenic enters Lake Crowley primarily from hot springs in Long Valley. Sixty percent of the arsenic discharged to Lake Crowley is from hot springs in Hot Creek Gorge. The hot-spring water containing about 1,000 micrograms per liter of arsenic blends with the water flowing in the creek and is usually diluted to a concentration of about 200 micrograms per liter; additional dilution occurs downstream. About 75 percent of the arsenic in Hot Creek is discharged from only two springs. The remaining sources of arsenic in the gorge are poorly defined seepage and flow from numerous small springs. Other sources of arsenic in Long Valley are from either high volume and low-arsenic concentration springs, such as the springs at Hot Creek Fish Hatchery, or high-concentration and low-volume springs, such as those found in the vicinity of the Alkali lakes. These other sources individually are small in comparison with the source in Hot Creek Gorge. It is unlikely that arsenic from these sources could cause the arsenic concentration in Lake Crowley to exceed the Environmental Protection Agency 's recommended criterion (limit) for public water supply. (Woodard-USGS)

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USGS Numbered Series
Sources of arsenic in streams tributary to Lake Crowley, California
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Water-Resources Investigations Report
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U.S. Geological Survey, Water Resources Division,
iv, 39 p. :ill., maps ;27 cm.