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Groundwater Quality in the Bear Valley and Lake Arrowhead Watershed, California

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Groundwater Quality in the Bear Valley and Lake Arrowhead Watershed, California U.S. Geological Survey and the California State Water Resources Control Board Groundwater Quality in the Bear Valley and Lake Arrowhead Watershed, California Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The Priority Basin Project of the GAMA Program provides a comprehensive assessment of the State’s groundwater quality and increases public access to groundwater-quality information. The Bear Valley and Lake Arrowhead Watershed study areas in southern California compose one of the study units being evaluated. The Bear Valley and Lake Arrowhead Watershed Overview of Water Quality Study Unit Inorganic Organic constituents constituents The Bear Valley and Lake Arrowhead Watershed study unit covers about 112 square 1 8 miles (290 square kilometers) in the San Bernardino Mountains of southern California. The 9 13 Bear Bear Valley study area is an alluvium-filled valley surrounding Big Bear and Baldwin Lakes 78 Valley and corresponds to the Bear Valley groundwater basin (California Department of Water 91 Resources, 2003). The Lake Arrowhead Watershed study area consists primarily of granitic 8 Lake bedrock and includes parts of six watersheds around Lake Arrowhead (Mathany and Burton, 34 25 2017). Arrowhead 41 Watershed 92 117°15' 117° 116°45' California e r ve Riv Bear Valley Aqueduct ja CONSTITUENT CONCENTRATIONS o study area M Baldwin High Moderate Low or not detected Big Lake (dry) Bear EXPLANATION Silverwood Lake Lake Values indicate percentages of the area of the ground- 34° Lake Arrowhead Lithology water resources used for public drinking water with 15' ek concentrations in the specified categories. e r Sedimentary deposits C Lake Arrowhead r a GAMA’s Priority Basin Project e Granitic rocks Watershed B San evaluates the quality of untreated study area ver Ri Metamorphic rocks n a groundwater. However, for context, 34° A Be rna ns concentrations measured in groundwater 07' ta rdino Mountai Study area boundary San Bernardino an 30" S are compared to benchmarks established for drinking-water quality. A concentration greater than a benchmark is defined as high. SA BA C 0 5 10 MILES VS C Benchmarks and definitions of moderate and 0 5 10 KILOMETERS low concentrations are discussed in the inset Base modified from U.S. Geological Survey and other Federal and State digital data, Lithology modified from Saucedo box on page 3. various scales; Albers Equal Area Conic Projection, standard parallels are 29° 30' and others, 2000 Many inorganic constituents are natural and 45° 30'; North American Datum of 1983 in groundwater, although the concentrations This study examined the quality of groundwater resources used for public drinking can also be affected by human activities. water supply in the two study areas. In 2010, the U.S. Geological Survey (USGS) collected One or more inorganic constituent was samples from 38 wells and springs distributed across the two study areas. Data from 2007 detected at high concentrations in the groundwater resources used for public to 2010 were compiled from the California State Water Resources Control Board (SWRCB) drinking water in about 9 percent of samples Division of Drinking Water database for 78 other public-supply sources in the study unit. from the Bear Valley study area and in In the Bear Valley study area, public-supply wells are typically drilled to depths about 25 percent from the Lake Arrowhead between 250 and 550 feet and screened in sedimentary deposits, but sometimes extend Watershed study area. into the underlying metamorphic and granitic basement rocks. Groundwater is primarily Organic constituents are in products recharged by winter precipitation in the mountains surrounding the valley, and groundwater used in the home, business, industry, pumping for municipal use has resulted in decreased groundwater levels in the Bear Valley and agriculture, and they can enter the study area (Flint and Martin, 2012). In the Lake Arrowhead Watershed study area, more than environment through normal usage, spills, half of the public-supply sources are springs or horizontal wells, and vertical wells typically or improper disposal. One or more organic constituent was present in the groundwater are drilled to depths of 230 to 500 feet. Wells and springs tap groundwater in the fracture resources used for public drinking water at systems of granitic bedrock. high concentrations in about 1 percent of Land use in both study areas is a mixture of natural and urban. Natural land cover is samples from the Bear Valley study area, and predominately forests. The Bear Valley study area has much more urban land use than the none were detected at high concentrations in Lake Arrowhead Watershed study area, at 58 percent and 21 percent, respectively. the Lake Arrowhead Watershed study area. U.S. Department of the Interior ISSN 2327-6916 (print) Fact Sheet 2017–3037 U.S. Geological Survey ISSN 2327-6932 (online) June 2017 https://doi.org/10.3133/fs20173037 sac16-0602_fig pies RESULTS: Groundwater Quality in the Bear Valley and Lake Arrowhead Watershed Study Unit INORGANIC CONSTITUENTS Inorganic Constituents with Human-Health Benchmarks Bear Valley Lake Arrowhead Trace elements are part of the natural composition of the minerals in rocks Watershed and sediments and, as a result, are in the water that comes into contact with those materials. In the Bear Valley study area, one or more trace element was in the Trace elements groundwater resources used for public drinking water at high concentrations in 9 3 about 9 percent of the samples. Fluoride and arsenic were detected at concentrations 7 greater than benchmarks. Trace elements were not detected at concentrations greater than benchmarks in the Lake Arrowhead Watershed study area. Radioactivity is the release of energy or energetic particles during spontaneous 84 97 decay of unstable atoms. Most of the radioactivity in groundwater comes from the decay of uranium and thorium isotopes that are part of the natural composition of minerals in aquifer materials. In the groundwater resources used for public drinking Uranium and radioactive water, radioactive constituents were detected at high levels in samples from about constituents 25 percent of the Lake Arrowhead Watershed study area. Uranium and adjusted gross 4 alpha particle activity were both present at high levels. No radioactive constituents were detected at concentrations greater than benchmarks in the Bear Valley study 25 37 area. Nutrients, including nitrate, are naturally present at low concentrations in 96 38 groundwater, and high concentrations generally occur as a result of human activities. Common sources of nutrients include fertilizer applied to crops and landscaping, seepage from septic systems, and human and animal waste. Nitrate was not present Nitrate at high concentrations in the groundwater resources used for public drinking water in 2 either the Bear Valley or Lake Arrowhead Watershed study areas. 3 Inorganic Constituents with Non-Health Benchmarks (Not included in water-quality overview charts shown on the front page) 98 97 Some constituents affect the aesthetic properties of water, such as taste, color, and odor, or can create nuisance problems, such as staining and scaling. The benchmarks used for these constituents are non-regulatory secondary maximum Total dissolved solids contaminant level benchmarks. Total dissolved solids (TDS) concentration is a measure of the salinity of the groundwater, and all natural waters contain TDS as a result of the weathering and dissolution of minerals in rocks and sediments. The State of California has a 100 100 recommended and an upper benchmark for TDS in drinking water. TDS was not found at concentrations greater than either benchmark in groundwater resources used for public supply in both the Bear Valley and the Lake Arrowhead Watershed study areas. Manganese and iron Anoxic conditions (low amounts of dissolved oxygen) can result in release 3 of natural forms of manganese, iron, and other trace elements from minerals to 8 groundwater. Manganese or iron was present in the groundwater resources used for 23 public drinking water at concentrations greater than benchmarks set for aesthetic 1 concerns in about 3 percent of samples from the Bear Valley study area and in about 89 76 23 percent from the Lake Arrowhead Watershed study area. Inorganic Constituents with Proposed Benchmarks Radon-222 (Not included in water-quality overview charts shown on the front page) 4 Radon-222, a radioactive gas formed from decay of uranium in aquifer 7 materials, is primarily a health concern for air quality inside buildings. It has a 21 31 proposed water-quality benchmark because levels in groundwater are predictive of potential levels in indoor air (National Academy of Sciences, 1999). Radon-222 was 75 62 present in the groundwater resources used for public drinking water at levels greater than the proposed benchmark in samples from about 4 percent of the Bear Valley study area and in about 62 percent of the Lake Arrowhead Watershed study area. sac16-0631_fig pies RESULTS: Groundwater Quality in the Bear Valley and Lake Arrowhead Watershed Study Unit ORGANIC CONSTITUENTS Organic Constituents with Human-Health Benchmarks Bear Valley Lake Arrowhead The GAMA Priority Basin Project uses laboratory methods that can detect Watershed volatile organic compounds (VOCs) and pesticides at concentrations much less than human-health benchmarks.
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