Dames & Moore, 1999 - USDA Forest Service

Assessment by Mining Consultant
The Draft RIIFS Work Plan included entry of the mine for sampling of the mine water and precipitates.
and to evaluate the structural integrity of the 1500-level tunnels. The possible mine entries were
determined to be the 1500- and 1100-level portals. However. due to worker safety issues related to
entering the mine, the underground mine maps were evaluated by a mining engineer, J.S. Knowlson &
Associates of Seattle, Washington, subcontracted by Dames & Moore. The evaluation also included
- additional map review and visits to the relevant portals by a Dames & Moore geologist and a mining
subcontractor (Atlas Fausett of Kellogg, Idaho). The results of the assessment have been incorporated
into Section 4.1.3.1.
3.7 TASK 7 - WINSTON HOME SITES ASSESSMENT
The Winston home sites area located west of Holden Village (Figures 3.0-3 and 3.1-5) included 103
houses which were demolished by the USFS. Fuel oil stored in both aboveground tanks (ASTs) and
underground storage tanks (USTs) were used to heat the houses. Some of the USTs remain as indicated
by the presence of apparent fill and vent pipes across the area. It is our understanding that the USFS had
not completed an inventory of USTs. Therefore, the scope of work included performing an inventory of
the tanks and a series of trackhoe-excavated test pits as discussed in Section 3.1-3.
The inventory of the USTs was based on the.presence of fill and vent pipes. The locations and types of
fill pipes, as well as the condition of the tanks (if observed) were documented, when possible, on a map of
-, the Site which included the surveyed locations of some of the remaining walls and other surface features
as references. The results of the inventory are presented in Section 4.1.2.6.
3.8 TASK 8 - FIELD SCREENING
Field screening was used extensively across the Site during each of the sampling events. Screening was
performed using a combination of field meters and qualitativelquantitative field chemistry tests.
Temperature, pH, specific conductance, and turbidity were measured and recorded in surface water,
groundwater, and seeps collected during the Phase I Rl.
In addition, oxidation/reduction potential and dissolved oxygen were added in May through July 1997 as
part of the Phase I Rl. During the Phase I RI, a qualitative chemical test for ferrous iron was performed
on groundwater and seep samples to aid in establishing significant changes in site chemistry based on
determination of a reducing or oxidizing environment. The colormetric test included adding a reagent to
a sample of seep and/or groundwater.
In addition to field measurements, field screening for pH and specific conductance was performed at
additional locations based on field observations. These locations were not specified in the SAP, but
included areas where water entered or potentially entered Railroad Creek that may result in a loading
source. Additional samples were collected if the field results indicated that the resulting water w~
affected by mine related activities (low pH andlor high specific conductivity) and/or the flow rate was
substantial. This resulted in several additional seep locations being identified on the Site for sampling
which were not presented in the SAP.
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17693-005-019Uuly 19, 1999;2:07 PM;DRAFT FNAL RI REPORT