Dames & Moore, 1999 - USDA Forest Service

Habitat parameters recorded included plant community type, tree density and height, the presence of
snags, vertical diversity, and any wildlife signs.
Surveys for bats were also conducted where roosting habitat was available at the 1500-level main portal.
the 1500-level ventilator portal, and the 1100-level main portal. The 300-level portal was also open:
however, due to health and safety concerns related to access, the portal was not entered. The surveys
were designed to be qualitative, as outlined in the SAP and approved by the agencies. The bat surveys
were conducted from 7 p.m. to 8:30 p.m. on warm, dry nights. Two observers sat at a single portal and
watched for bat activity. Only one portal was surveyed per night. The results of the survey efforts at this
location are discussed in Section 4.6.
3.10 TASK 10 - LABORATORY ANALYSIS AND QUALITY ASSURANCEIQUALITY
CONTROL
3.10.1 Laboratory Analysis Procedures and Quality AssurancelQuality Control
3.10.1.1 Geotechnical Laboratory Analysis
The data analysis presented in the following sections relied on the data presented by Hart-Crowser in their
1975 report and geotechnical samples collected by Dames and Moore in 1997. The laboratory analyses
completed by Dames & Moore geotechnical laboratory included grain size and moisture content.
Atterburg limits were not determined due to the absence of cohesive soils in the samples collected. Direct
shear testing was not conducted as noted in the SAP due to the inability to collect undisturbed samples in
the field.
3.10.1.2 Soil and Water Quality Analysis
Laboratory data was collected to satisfy the Data Quality Objectives (DQOs) presented in Section 5.0 of
the draft RI Work Plan (June 16, 1997). The rationale for the selection of the most appropriate laboratory
analytical methodologies for use during the RI were based on the risk based screening levels (RBSLs) for
the compounds of concern as shown in Table 5-2 of the draft RI Work Plan. The DQOs and RBSLs were
refined during each phase of the Ri. The refined DQOs and RBSLs were provided in the Phase I, 11, and
I11 QAPPs. The selection of analytical methodologies was based on achieving analytical method detection
limits (MDLs) and practical quantitation limits (PQLs) that were at or below the RBSLs.
A combination of methodologies from EPA Test Methods for Evaluating Solid Waste, SW846, Methods
for Chemical Analysis of Water and Wastes, EP-60014-79-020, Standard Methods for the Examination of
Water and Wastewater, 18th edition, and Ecology methods were used in the analytical program. Sample
analyses were performed by Analytical Resources, Incorporated (AM) located in Seattle, Washington.
Low level mercury analysis was subcontracted by ARI to Brooks Rand Ltd. located in Seattle,
Washington. Low-level lead analyses were performed by Frontier Geosciences. in Seattle, Washington.
Specific laboratory methodologies that were used in each phase of the RI are provided in the associate&.
QAPPs. Modifications to methods were necessary to achieve MDLs and PQLs. During the course. of the
program, method revisions to the QAPP were made due to more significant matrix interferences than
originally anticipated. Method modifications and QAPP revisions were documented in the QAPP and in
memoranda with the agencies at the time of occurrence. Low-level detection limits were achieved to
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