Idaho National Laboratory Environmental Monitoring Plan

INL Site drinking water systems are monitored to ensure that contaminant concentrations meet limits
established by IDAPA 58.01.08, “Idaho Rules for Public Drinking Water Systems, 32 and Public Law 104-
182, “Safe Drinking Water Act.” 33 Monitoring is based on the classification and size of the water systems
(e.g., nontransient, noncommunity or transient, noncommunity). Because of known contaminants, certain
parameters are monitored more frequently than required.
Offsite drinking water systems are also monitored because of the potential for contaminants related to
INL Site operations to migrate beyond the INL Site boundary. Because these samples are collected from
offsite drinking water systems, they are included as drinking water samples. However, results from
samples collected from these offsite drinking water systems are not used for compliance with drinking
water regulations; instead, they are used to assess groundwater quality. Section 4.3 discusses the
groundwater monitoring samples taken directly from wellheads.
Figure 4-3 shows regional drinking water monitoring locations. Regional drinking water samples are
collected from taps. Onsite drinking water samples are collected from the point of entry to each
distribution system or manifold, directly from the wellheads, and from buildings associated with each
drinking water distribution system. Figure 4-4 shows the detailed locations of those manifolds and
wellheads that are currently monitored across the INL Site. Individual sampling points from each drinking
water distribution system are not shown on Figure 4-4 because these sample points include most buildings
connected to the distribution system.
4.2.1 INL Contractor
The INL contractor performs all drinking water monitoring and is responsible for all site drinking
water systems with the exception of INTEC and RWMC, which are ICP contractor facilities. Currently,
the INL contractor monitors 19 wells and nine distribution systems across the INL Site for both
radiological and nonradiological parameters. Sampling locations, parameters, and frequencies are
documented in the PLN 8530, “Idaho National Laboratory Drinking Water Program Plan,” 34 and
associated procedures.
4.2.2 ICP Contractor
The ICP contractor monitors drinking water systems at INTEC and RWMC. The ICP contractor is
responsible for regulatory compliance at these facilities. Sampling locations, parameters, and frequencies
are documented in PLN-730, “Idaho Cleanup Project Drinking Water Program Plan,” 35 and associated
procedures.
Environmental Surveillance 4-6