ML20205K065
| ML20205K065 | |
| Person / Time | |
|---|---|
| Site: | 07000364, 07003085 |
| Issue date: | 03/25/1999 |
| From: | Baldassare F PENNSYLVANIA, COMMONWEALTH OF |
| To: | Rosenthal P AFFILIATION NOT ASSIGNED |
| References | |
| NUDOCS 9904120312 | |
| Download: ML20205K065 (2) | |
Text
70-304
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y Pennsylvania Department of Environmental Protection 400 Waterfront Drive Pittsburgh, PA 15222-4745 March 25,1999 Southwest Regional Office 412-442-4000 Fax 412-442-4194 Philip R. Rosenthal Senior Project Manager B%T Technologies, Inc.
P.O. Box 11165 Lynchburg, VA 24506-1165 Re: Parks Shallow Land Disposal Area (SLDA) 1999 Field Program Work Plan February 1999
Dear Mr. Rosenthal:
The Department has reviewed the above referenced Work Plan received in this office on March 2,1999. It is ststed that "The primary objective for the proposed 1999 data collection effort is to obtain the data needed to perform a fate and transport analysis" Before we can approve this Work Plan please address the following comments:
1.
A proposal to evaluate the hydraulic properties of the hydrostratigraphic units underlying the SLDA is not provided m this Work Plan. Hydraulic characterization is fundamental j
to performing a meaningful fate and transport analysis. A porous media approximation is
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notjustifiable for this area because of the scale and complexity of the groundwater flow system. The fracture flow groundwater regime at the SLDA is further complicated by the underground mine workings in the area. The Department recommends n long term pumping test to estimate hydraulic properties inclu' ding anisotropy, aquifer stratification, hydraulic conductivity, and connectivity with the different water bearing units at the site.
Additionally, BWXT and ARCO may want to consider the applicability of electromagnetic (EM) borehole flowmeters in ground water monitoring wells as a method to characterize groundwater flow and the hydraulic properties of the underlying hydrostratigraphie units. Performance of EM borehole flowmeter tests may not require j O_
pumping as much ground water as a conventional pumping test.
The EM borehole flowmeters allow direct estimation of the spatial distribution of hydraulic conductivities. By performing flowmeter tests in a network of properly [3.
t U constructed and sited monitoring wells a three dimensional representation of the distribution of hydraulic conductivities can be determined. EM bore hole flowrneter tests may also better reveal the hydraulic connection of the underlying hydrostratigraphic units 9904120312 990325
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Philip R. Rosenthal March 25,1999 with the underground mine workings. Vertical flow logs can also be developed from $M flowmeter tests to identify hydraulically active fractures. Hydraulic properties determined from the EM borehole flowmeter tests could be utilized in the fate and transport analysis for the SLDA.
2.
Locations for all temporary piezometers should be agreed upon in the field with Department personnel.
If you have any questions or if you would like to discuss these Work Plan comments, please call me at 412-442-4145.
Sincerely, Y{
(k Fred Baldassare, P.G.
Hydrogeologist Environmental Cleanup cc:
D. A. Orlando, NRC e i
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