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Test water samples for Mojave National Preserve. The National Park Service is looking for a State of California approved water quality testing laboratory to conduct the set of tests required by the st... Test water samples for Mojave National Preserve. The National Park Service is looking for a State of California approved water quality testing laboratory to conduct the set of tests required by the state for potable water systems under the California Code of Regulations Title 22. Also required are the water quality tests for Per- and Polyfluoroalkyl Substances (PFAS) that the EPA has mandated. These tests need to be performed at a laboratory approved by EPA for conducting tests for PFAS. Lab must be within ninety (90) minutes drive from Barstow, California. Samples will be taken the week of April 11, 2022.