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| Title | Estimates of Ground-Water Contaminant Loading to the Colville River in the Vicinity of L-Bar Products | |||
| Month-Year Published | October 1995 | |||
| Online Availability |
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| Short Description |
The hydrogeologic evaluations and estimates in this report are based on historic data only. No new data were collected for the project. The historic data are somewhat intermittent and data quality control is questionable. Numerous unknowns about the geology, hydrology, and ground-water flow necessitated the use of numerous assumptions. (Also see abstract below) | |||
| Publication Number | 95-344 | |||
| Author(s) | Garrigues, R. | |||
| Print Availability | ||||
| Number of pages | 12 pp. + app. (51 total) | |||
| Keywords | ammonia, chloride, colville river, contaminant, evaluation, flow, ground water, groundwater, irrigation, model, product, river, toxic, toxics, water | |||
| Subject Waterbodies |
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| Abstract | Long Description |
The hydrogeologic evaluations and estimates in this report are based on historic data only. No new data were collected for the project. The historic data are somewhat intermittent and data quality control is questionable. Numerous unknowns about the geology, hydrology, and ground-water flow necessitated the use of numerous assumptions. The L-Bar Products, Inc. facility is undergoing a Model Toxics Control Act (MTCA) investigation and cleanup. Evaluation of the new data generated by the remedial investigation will likely result in substantially different conclusions than contained in this report. The MTCA investigation began in mid 1995 and by October 1995 "qualitative and quantitative knowledge of the ground-water/surface-water system is evolving rapidly". Due to the abundance of ground-water flow control structures at L-Bar Products, Inc. and poor historic records concerning those structures, it is impossible, with available data, to evaluate the present ground-water flow characteristics at the facility. However ... Natural ground-water flow characteristics can be estimated based on historic data and basic ground-water hydraulics. Under natural ground-water flow conditions: (1) ground-water velocity ranges from 0.47 ft/yr to 4.7 ft/yr.; (2) natural ground-water travel time from the northwest side of the sludge-bar residue pile to the Colville River (about 1000 ft) ranges from 210 years to 2100 years; (3) chloride loading to the Colville River via leakage from ditch D1 is about 330 Kg/day; and (4) chloride loading to the Colville River via ground water ranges from 1.7 to 17 Kg/day -- 0.5 to 5 percent of the loading from ditch D1. Chloride loading to the Colville River via ground water is relatively insignificant compared to the loading occurring from ditch D1 and other possible human-enhanced sources such as irrigation return flows and ditch D2 transmitting contaminants from the south end of the L-Bar site. Ammonia loading to the Colville River via ground water is relatively insignificant compared to the loading occurring from ditch D1. |
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