TABLE H.1 Water Sampling and Analysis Recommendations

Sample Number of Representative Samples and Sample Locations Sampling and Collection Frequency Type and Frequency of Analysis

Surface water One sample upstream (Wa1), one sample downstream (Wa2) Composite sample over 1-month period Gamma isotopic analysis monthly; composite for tritium analysis quarterly
Groundwater Samples from one or two sources (Wb1, Wb2) only if likely to be affected Quarterly Gamma isotopic and tritium analysis quarterly
Drinking water One sample of each of on to three (Wc1-Wc3) of the nearest water supplies that could be affected by its discharge; one sample from a control location (Wc4) composite sample over 2-week period when I-131 analysis is performed; monthly composite otherwise 1-131 analysis on each composite when the dose calculated for the consumption of the water is greater than 1 mrem per year. Composite for gross beta and gamma
isotopic analyses monthly.
Composite for tritium analysis quarterly.
Sediment from shoreline One sample from downstream area with existing or potential recreational value (Wd1) Semiannually Gamma isotopic analysis semiannually

a. Gamma isotopic analysis means the Identification and quantification of gamma-emitting radionuclides that may be attributable to the effluents from the facility.
b. The “upstream sample” shall be taken at a distance beyond significant influence of the discharge. The “downstream” sample shall be taken in an area beyond but near the mixing zone. “Upstream” samples in an estuary must be taken far enough upstream to be beyond the plant influence. Saltwater shall be sampled only when the receiving water is utilized for recreational activities.
c. A composite sample is one in which the quantity (aliquot) of liquid sampled is proportionalto the quantity of flowing liquid and in which the method of sampling employed results in a specimen that is representative of the liquid flow. In this program composite sample aliquots shall be collected at time intervals that are very short (e.g., hourly) relative to the compositing period (e.g., monthly) in order to ensure obtaining a representative sample.
d. Groundwater samples shall be taken when this source is tapped for drinking or irrigation purposes in areas where the hydraulic gradient or recharge properties are suitable for contamination.
SOURCE: Offsite Dose Calculation Manual Guidance: Standard Radiological EffluentControls for PWRs, Generic Letter 89-01, Supplement No. 1, April 1991, U.S. NRC, NUREG-1301.

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