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Dames & Moore, 1999 - USDA Forest Service

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9. The August 17, 1998 draft'of the Lucerne Bar Sediment Reconnaissance Plan (<strong>Dames</strong> &:<br />

<strong>Moore</strong>, 1998f) and supponing figures.@ames & <strong>Moore</strong>, 1998k)<br />

10. The August 28, 1998 draft of the Phase 111 RI Work Plan Addendum - Downloading<br />

Groundwater Level Data, Lagoon Area Soil Sampling, Background Soil Sampling (<strong>Dames</strong><br />

& <strong>Moore</strong>, 19988)<br />

1 1. The September 10,1998 draft of the Phase 111 RI Addendum - Stream Flow Measurements<br />

and Geologic Mapping (<strong>Dames</strong> & <strong>Moore</strong>, 1998h)<br />

12. The October 7, 1998 draft of the Phase 111 RI Selection of Sediment Sampling Reference<br />

Locations (<strong>Dames</strong> & <strong>Moore</strong>, 1998j)<br />

The agencies approved the above-mentioned plans in the following documents:<br />

1. The March 26, 1998 Agency Comments on the Draft RIFS Work Plan (USFS, 1998a)<br />

2. The April 24, 1998 Agency Preliminary Comments - Phase 111 RI Draft SAP and QAPP<br />

(USFS, 1998b)<br />

3. The April 30, 1998 Agency Approval of Alumet's April 27, 1998, Letter Response to<br />

Agency's Preliminary Comments - Phase 111 Draft SAP and QAPP (USFS, 1998c)<br />

4. The May 29, 1998 Agency Consultant Initial Comments on Dye Tracer Program SAP<br />

(Patmont, 1998)<br />

5. The September 22, 1998 Agency Comments on Phase 111 Draft SAPS Dated August 17,<br />

1998, August 28, 1998, September 10, 1998 (USFS, 1998d)<br />

Alumet's formal responses to Agency comments were documented in the following:<br />

I. The April 27, 1998 Alumet Response to April 24, 1998 Agency Comments on Draft Phase<br />

111 Draft SAP aid QAPP (Jackson, 1998)<br />

2. The October 5. 1998 Alumet Responses to September 22, 1998 Agency Comments on<br />

Phase 111 SAPS dated August 1 7, 1998, August 28, 1998, September 10, 1998 (<strong>Dames</strong> &<br />

<strong>Moore</strong>, 1998i)<br />

1.1 BACKGROUND<br />

For the purposes of the RI, the "Site" includes the general area within the Railroad Creek valley, in which<br />

Holden Mine is situated, between the upstream wilderness boundary to immediately downstream of the<br />

eastern end of the tailings piles; the "Railroad Creek watershed" includes the entire watershed area from<br />

Lyman Glacier to Lake Chelan; the "aquatic reference reaches" include one stream segment each in<br />

Bridge Creek, South Fork of Agnes Creek, and Company Creek which are located to the north of the<br />

Railroad Creek Watershed and were sampled for aquatic biota and water quality for comparison to<br />

appropriate segments 'of Railroad Creek; "Lucerne Bar" includes the portion of Lake Chelan near the<br />

mouth of Railroad Creek that was sampled for the analysis of sediment quality; and the "Lake Chelan

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