Effluent variability study for the 200 area treated effluent disposal facility Page: 4 of 206
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WHC-SD-LEF-EV-001, Rev. 0
Semivolatiles. Only bis(2-ethylhexyl)phthalate consistently was
detected. This constituent is an ubiquitous organic compound in plastic pipe
cements and related products, and is not associated with Hanford Site
operations. There was one apparent detection of phenol (2 parts per billion).
Metals (total). Of the permit-required metals analyzed, only iron was
consistently detected and present in concentrations that approached or
exceeded Permit limits. The monthly average Permit limit of 258 parts per
billion was exceeded for only the month of April, due to a single excursion
event that occurred in both grab and composite samples collected on April 7th.
Mercury was detected in 24 percent of the samples analyzed at concentrations
that were at or below the practical quantitation limit of 2 parts per billion.
Lead, arsenic, cadmium, and chromium were detected at very low frequencies
(<10 percent). Manganese was detected about 50 percent of the time and
appeared to be detected more frequently during summer (grab samples only).
Manganese also appeared to be covariant with iron.
Anions. Sulfate, chloride, and nitrate were all consistently detected.
However, only chloride concentrations approached a daily maximum Permit limit.
For example, one large spike in chloride concentration occurred for a grab
sample that slightly exceeded the daily maximum Permit limit of 116 parts per
million during the first week of February (because the sample was taken to
support the effluent variability study and not compliance monitoring, this was
not considered a violation of the Permit limit). This was attributed to road
salt in parking lot run-off from rapidly melting snow. Flow rate of the
combined waste stream was more than double the average (x = 380 gallons per
minute) during the run-off event.
Cyanide. Total cyanide was detected in 17 percent of the samples
analyzed and all results were at or below 10 parts per billion (practical
quantitation limit and permit limit = 50 parts per billion).
Total petroleum hydrocarbons (WTPH-G)/oil and grease. Gasoline and
related hydrocarbons were detected in 20 percent of the samples analyzed and
oil and grease were detected in about 50 percent of the samples analyzed, none
of which approached Permit limits. In the latter case, most of the detections
were at or near the detection limit.
Gross alpha, gross beta and radium. Gross alpha and gross beta
concentrations were near natural background levels for Columbia River water
(<1 picocurie per liter) except during September and October. During these
2 months, a PUREX Facility related event caused monthly average gross beta in
the TEDF waste stream to increase to a maximum of 43 picocuries per liter
based on grab samples, and 31 picocuries per liter based on composite samples.
Radium-226 and radium-228 were below detection in all samples analyzed.
Variability Analysis and Permit Exceedance Probability. A summary of
variability and exceedance probability for those constituents consistently
detected >50 percent of the time are summarized in the following table.
Overall variability in effluent samples collected over the period of
observation ranged from low [<25 percent coefficient of variation (CV)] to
very high (>100 percent CV), depending on the constituent and time of year.
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Chou, C.J., Westinghouse Hanford. Effluent variability study for the 200 area treated effluent disposal facility, report, July 12, 1996; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc711463/m1/4/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.