74 «@ The Containment of Underground Nuclear Explosions Figure 4-10—Locations Monitored With Thermoluminescent Dosimeters (TLDs) L | \_\ Nevada Wells Winnemucca Pyramid Lake 4 a tb Reno Pw iy Ely Lake Tahoe e ° Tonopah Mono Lake e b -<—,° ° Nellis ~~ George Bishop ° D Arizona Lake Mead Bakersfield Barstow 0 30 leased Scale in Miles One hundred thirty locations are monitored with TLDs. All TLDs are checked every 3 months for absorbed radiation. SOURCE. Modified from Environmental Protection Agency. ries of the test site has ever had detectable levels of radioactivity attributable to the nuclear testing program. An independenttest of water samples from around the test site was conducted by Citizen Alert (Reno, Nevada) at 14 locations(table 4-3). Citizen Alert found no detectable levels of tritium or fission products in any of their samples. With- Standing any major change in the watertable, there currently appears to be no problem associated with groundwater contamination offsite of the Nevada Test Site. MONITORING CAPABILITY The combination of: 1) the monitoring system deployed for each test, 2) the onsite monitoring system run by DOE, and 3) the offsite monitoring system run by EPA, forms a comprehensive detection system for radioactive material. There is