Dames & Moore, 1999 - USDA Forest Service
Dames & Moore, 1999 - USDA Forest Service Dames & Moore, 1999 - USDA Forest Service
D.7 D. 8 D. 9 E.0 SOURCE: Base map information from USFS and Washington DNR, DEM CD ROM Figure 8.2-3 DAMES & MOORE RI HYDROLOGIC INVESTIGATIONHITE A DAM3 (L MOORE GROUP COMPANY Holden Mine RVFS Draft Final RI Report
9.0 CONCLUSIONS AND RECOMMENDATIONS The data collected during the course of the RI are sufficient to define the nature and extent of compounds of concern, the pathways and receptors of concern and to serve as a basis to complete the Feasibility Study. The objectives, conclusions and recommendationsand key findings of the RI are summarized in this section. One remaining RI data collection activity has been identified by the Agencies in order to augment or clarify specific findings and conclusions related to sediment. The results will be appended to this document after the field data collection and analyses are completed. 9.1 OBJECTIVES OF THE RI The RI objectives have been addressed as follows: a The environmental setting of the Site has been characterized a The presence, magnitude, nature and extent of potential environmental concerns determined to be associated with historic mining activities have been defined • The potential pathways and rates of migration of compounds of potential concern on the Site have been characterized a The potential receptors of compounds of potential concern associated with the historic mining at the Site have been evaluated • The stream habitat has been characterized a The analytical data generated from the investigation in terms of applicable, relevant, and appropriate regulations, including both state and federal requirements, have been evaluated • Relevant data of sufficient quality have been provided so that the FS can evaluate cost- effective remedial alternatives that will address significant environmental concerns identified on the Site. 9.2 CONCLUSIONS Referring to Figures 9.2- 1 through 9.2-5, the RI conclusions are described below: 9.2.1 Host Rock Mineralogy The Holden Mine ore deposit is hosted by the Buckskin Schist. which is a quartz amphibole schist sequence with at least two horizons of intermittent marble beds and calcareous schists. The dominant silicates are plagioclase and biotite (aluminum-based). The primary sulfide minerals in the Holden Mine ore deposit include pyrite, pyrrhotite, sphalerite and chalcopyrite. G:\WPDATA\OO5\REPORTSWOLDEN-ZUU\9-OOd~ 9- 1 17693-005-019Uuly 28. 1999;10:07 A M;DW FINAL R1 REPORT
- Page 1124 and 1125: I SOURCE RELEASE EXPOSURE . MECHANI
- Page 1126 and 1127: MEDIA FIGURE 7.1-3 FLOW CHART ILLUS
- Page 1128 and 1129: I I 8.1 INTRODUCTION 8.0 DISCUSSION
- Page 1130 and 1131: 8.2.2 Geology 8.2.2.1 Railroad Cree
- Page 1132 and 1133: The bedrock in the mine has been ma
- Page 1134 and 1135: Railroad Creek and Copper Creek. Th
- Page 1136 and 1137: where Railroad Creek flows directly
- Page 1138 and 1139: A 500-year event was not analyzed,
- Page 1140 and 1141: i flow associated with two seeps ad
- Page 1142 and 1143: Western Portion of Site Undermound
- Page 1144 and 1145: native soil is of higher permeabili
- Page 1146 and 1147: Macroinvertebrate sampling included
- Page 1148 and 1149: Above Tenmile Creek Confluence (RC-
- Page 1150 and 1151: Reference Reaches - Stehekin River
- Page 1152 and 1153: 3 during the 1997 investigation ind
- Page 1154 and 1155: Subsurface Soils Cadmium, copper, a
- Page 1156 and 1157: Station' RC-4 RC-7 RC-2 RC-5 RC-10
- Page 1158 and 1159: 8.3.4.1 Western Portion of Site Dur
- Page 1160 and 1161: 0 mine, Honeymoon Heights, the wast
- Page 1162 and 1163: I . During The water from the west
- Page 1164 and 1165: a The Copper Creek diversion accoun
- Page 1166 and 1167: 8.5.2.1 Trout An intem~ediate poten
- Page 1168 and 1169: i SOURCE: Walten et al., 1992 USGS
- Page 1170 and 1171: SOURCE: Base map information from U
- Page 1172 and 1173: NOTE: This cross section is general
- Page 1176 and 1177: 9.2.2 Site Surface WaterIGroundwate
- Page 1178 and 1179: 9.2.4.1 Portal Drainage The chemica
- Page 1180 and 1181: Groundwater discharge from the tail
- Page 1182 and 1183: The combined results of the ERA and
- Page 1184 and 1185: 9.2.11 . Winston Home Sites Fuel St
- Page 1186 and 1187: SOURCE: USGS Topographic Map, State
- Page 1189 and 1190: SOURCE: Base map information from U
- Page 1191 and 1192: 10.0 PROJECT SCHEDULE The, schedule
- Page 1193 and 1194: I ATSDR. 1990. Toxicological profil
- Page 1195 and 1196: Dames & Moore, 1998b. Phase I11 Rem
- Page 1197 and 1198: Ebbutt,%F. 1956. Letter Report to V
- Page 1199 and 1200: ';i 1 Products, Shale-oils and Soot
- Page 1201 and 1202: Leland, H.V. and J.L. Carter. 1984.
- Page 1203 and 1204: I Pacific Northwest Laboratory. 199
- Page 1205 and 1206: Seed, H.B., Idriss, I.M. and Arango
- Page 1207 and 1208: U.S. EnvirOnmcntal Protection Agenc
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- Page 1211: l#e~ehat~ihi& ~ati'onsi '~ol'c!en.~
- Page 1214 and 1215: 7 MEMORANDUM Date: To: From: Subjec
- Page 1216 and 1217: INORGANICS ANALYSIS DATA SHEET Samp
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- Page 1220 and 1221: G CHAIN-OF-CUSTODY RECORD WHITE COP
- Page 1222 and 1223: June 15, 1998 Surface Water, May 19
D.7 D. 8 D. 9 E.0<br />
SOURCE: Base map information from USFS and<br />
Washington DNR, DEM CD ROM<br />
Figure 8.2-3<br />
DAMES & MOORE RI HYDROLOGIC INVESTIGATIONHITE<br />
A DAM3 (L MOORE GROUP COMPANY<br />
Holden Mine RVFS<br />
Draft Final RI Report
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