20210108 10075000 1.0 TRUE TRUE RadonPotentialZones This digital layer contains polygons (vector format) of portions of California designated as having high, moderate, low, or unknown potential for homes to exceed the U.S. EPA recommended radon action level of 4.0 picocuries per liter in indoor air. Only a portion of California is covered by the studies included in this dataset. Radon California California Geological Survey California Department of Conservation California Geology Geologic Hazards Land Use Planning Minerals Mineral Hazards Mineral Resources California Natural Resources Agency CAOpenData CGS DOC CNRA Radon California California Geological Survey California Department of Conservation California Geology Geologic Hazards Land Use Planning Minerals Mineral Hazards Mineral Resources California Natural Resources Agency CAOpenData CGS DOC CNRA This digital layer is intended for use by county staff to identify those portions of the county area where homes are more likely to have indoor-air radon concentrations exceeding the U.S. EPA recommended radon action level of 4.0 picocuries per liter. This digital layer should assist them in identifying areas where indoor-radon testing should be encouraged and public awareness programs may be beneficial. California Geological Survey, California Department of Conservation This map layer is intended for use by staff to identify portions of the county where homes are more likely to have indoor-air radon concentrations exceeding the U.S. EPA recommended radon action level of 4.0 picocuries per liter (pCi/L). The four radon zone categories indicate the likelihood of a home having indoor-radon concentrations at or above the 4.0 pCi/L action level: High (>20 percent), Moderate (5 to 19.9 percent), Low (< 5 percent), and Unknown (insufficient data to estimate the radon potential). The map layer does not provide specific information about the indoor-radon concentration of a home at any given location within a zone. The only way to accurately determine the indoor-radon concentration within a home at any location is by testing the indoor-air of that home. This can be done by the homeowner using inexpensive testing devices which are sent to commercial laboratories for evaluation or by certified radon testing professionals. This map layer is designed to be used at a map scale of 1:100,000 and not more detailed scales. At this scale it is not unusual for geologic unit boundaries (and, consequently, corresponding radon zone boundaries) to have accuracy limitations of plus or minus tens to several hundred feet and sometimes more. Consequently, radon zone classifications are less certain for locations nearer zone boundaries. CGS does not guarantee the accuracy of radon potential limitations for property parcels based on this map. /9j/4AAQSkZJRgABAQEAAAAAAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0a HBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIy MjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjL/wAARCACFAMgDAREA AhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQA AAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3 ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWm p6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEA AwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSEx BhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYkNOEl8RcYGRomJygpKjU2Nzg5OkNERUZHSElK U1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6goOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3 uLm6wsPExcbHyMnK0tPU1dbX2Nna4uPk5ebn6Onq8vP09fb3+Pn6/9oADAMBAAIRAxEAPwD3+gAo AKACgAoAKACgAoAKACgAoAhmmSCCSaQ4SNSzH2AyaUmoptjjFyaiupBp+o22pW/n2zM0fTLKV/nW VOtCrfkexVSnKm+WRdrYgKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKAKl+w WwuCegiYnAz2NZ1v4cvRlQ+Ja2MzRNW02eCG0hmiS6MZc25YCTAOCxHXB6/jWeFcfZq2htWozjeW 8e/Q3q6DnCgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgCvcoZbaWNcbnQqM+ pFZVYuUJRW7Q42ur7HK6L4Rk07xMdXaRSGhaMqDnGcdPbr61x4PD1aT/AHh6OIxyqUfYx20Oyr0T zQoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKA CgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAK ACgAoAKAOf1C/m03U1YIZI7gAKo9Rxgeh5rgr1nRrK32iqdKU2+Vr+uvy6m8rFlBIKkjJB7V3kjq ACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgDE8Q6bJf2gMRO+MH5R1I9vfi vOx9CVSKnDeJvhXCNVOexBpGuPLHFDfIySH5RKRgMfcdj/nijCY3nSjU0Y8XGlTqOMGdFXonOFAB QAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQBi+IJrcWJidl84kMi5569fyzXB mEoey5Xv0IqK8bjtG1NbqMQSYEyDAx/EPWjB4r2i5JbihO+jNiu80CgAoAilmjhjZ5GCqoyT7VMp qCvITdldj1YMoZTkEZBHemmmroY6mAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFAHOeJdOW 8ihm8nzDFu5AyVBHUeledmFKUkpR6EurUp6wfr/wTmRqR02dGYyJtAPn4+X6E15EJSg+aO5dLCuv 79Jq/wDLfX5HY2muW88SCRgkxB3Dtn6+9exQzCnNJS0kOolBrqmaysHUMpyCMg13ppq6JHUwPOfH OsW2ja7aSLbm5uZYsSRmRgAgPGPcnPT0rzMbGLmmz1sDl0sbSanK0Ivt1NzwhqVxeWci3UQgJYvF ASSyr6E9/wAh1qsDVTvTXyPMrQo0qjpUpcyXXv6HVV6JAUAFABQAUAFABQAUAFABQAUAFABQAUAF ABQAUAFABQBxfiTSCiuYdwimBzzwDnlfYGvDxuH9lLmjsxUakcPWjUaurnM6YbmzuDYylnhCFoWf hgAcYPY/WvOqTsuZbnuV8PhsbD20XZ9bbXfX+kdlpOuuojt7vBX7ok6Y9M+1ejgsyvanP7zzcThp UWtNDqK9w5jz7xv4ebVtXt7iOV4mSHYzKucjJ6eleTjm1U0V9DvwmavCRlTceZPVepZ0OxhsLy1S FLpI1+U+ZIXBOOvI4/Dj2rKhJOtF8tjgr4t4ipzSik/JW/r8zuK9sAoAKACgAoAKACgAoAKACgAo AKACgAoAKACgAoAKACgCC5to7qBoZRlG64NZ1KcakeWWwmk1ZnA6/o97ayefBKVjVxsLEbWHofRu 1eFicNKldNXR15dVpUanLUWj6/10/wCHIPNV4wZI2VWXJ3LwPUGvL5JJ3R6yq03LkjO7XT+vwO00 vV4L5EjMiLcYJ8rOCQO4HpyK+owWLVeGvxHkYjDum218Pf8AQ2K7TmCgAoAKACgAoAKACgAoAKAC gAoAKACgAoAKACgAoAKACgAoAKAM/VLB9QtlhWXysOGJK7gR6YzWGIoe2hy3sFk1qecSi50zWGts FrZ5MYC5GcnJHcc44PvXz1SLi2t2j04xw2Jw7lOVpxW99bLa+yfy12LL3U2mXVvJDETEDjei5MZP Q+49sVVKTi+eOjRx4eXtFP3/AHvPaS/zO10TUjqNqd5zJGBuYchwRw3THODwOle7hcQq0fNbmdSK +KPXp28jZrpICgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKAOEv9qX1xggKJG78 da+Zr2VWSXc5nTnK7USCszLYsWl7cWbEwSbc4yMZBrWlWnSfuMtSktjbstfe4uo4ZYkVXONwJ4Ne lQx7nNRktzWNRt2aN+vTNgoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKACgAoAKAM280axv2 3TxEkjB2nGfriuaphKNSXPJalxqSjsypJ4YtMfupZ4x6BgR+oNZSy+i9tBScZbxX4/5lS/8AD7xQ +ZaSF9oyyv1+o/wrlrYDljzU3cw9lBasxRlSCDyOc15Uol0K/JNtLp6mvB4sMzOixI5jIVyM4zj1 6V6scynZXiXVjKmouXXvo/u1J/8AhJpB1tV/7+f/AFqr+0ZLVxOf2z7G5Z3BurSOcpsLjO3Oa9Gj U9pBTta5rF3VyxWpQUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFAGZc6JZ3JLeWY2 PUocZ/CuOpgqM+lvQlQincxdU0S00+BJrcBPm2kHHOfSuHF4KFKPPAqpVqyha7aWuuplqBuG7OM8 46159tkZUPZzm/aHcWbwyWkZhP7sKAM9Rivp6duRcuxottCzVjCgAoAKACgAoAKACgAoAKACgAoA KACgAoAKACgAoAKACgAoAKAI5I0lXbIqsvowzUyipK0lcabWxQ1DSYb0bgdkoGAw6H61zYjCQra7 MzcE3dbkGi2dxbNN5wZADgLnhvelg41IQcZ9GaOKWzNquwQUAFABQAUAFABQAUAFABQAUAFABQAU AFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAFABQAUAf/9k=