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Additional detail regarding the release scenarios is discussed iri Section 2.0. Dames & Moore conducted a preliminary site assessment including sampling and analysis of potentially affected process materials at the facility. The results of this preliminary assessment are discussed in Section 3.0. 1.2 Purpose The purpose of this SAP is to provide the approach for determining whether weed killer is ' present in process and environmental media at B&B's Montgomery Pit facility; and, if so, determining the range of concentrations present. Central to this purpose is the delineation of the extent of affected media identified during the preliminary site assessment in order to ~, accelerate remedial action, if necessary. Subsequent sampling and analysis efforts may be necessary if the information provided by this effort indicates the need for a formal risk assessment, or identifies affected media beyond that confirmed by the preliminary sampling. 1.3 Objectives The following specific objectives support the aforementioned purpose: • Identify chemicals potentially released ' Identify media potentially affected • Evaluate fate and transport characteristics of the released chemicals in the potentially affected media • Evaluate toxicity of released chemicals considering potential exposure pathways • Select the chemicals and media targeted for sampling and analysis • Determine the number and locations of samples necessary to establish if affected media are present; and, where preliminary sampling has confirmed the presence of affected media, define their extent. • Define the appropriate techniques for collecting samples from each potentially affected media. • Select the appropriate analytical methods for identifying and quantifying released chemicals in each potentially affected media. • Determine the regulatory status of affected media. • Evaluate appropriate corrective actions and estimate mitigation costs. 1.4 Approach and Oryanizar'ion To achieve the aforementioned purpose and supporting objectives, this SAP applies a systematic approach that is designed to be technically sound and accurate. This approach involves 7 main components, briefly described below. Section 2.0 -Potentially Released Chemicals and Potentially Affected Media -describes the reported activities that may have released chemicals, reviews Material Safety Data Sheets (MSDS) provided by B86, and evaluates the process flow of materials (sand, gravel, asphalt, etc.) at the facility, to identify the potentially released chemicals and potentially affected media. ' Section 3.0 -Preliminary Assessment -discusses the preliminary sampling and analyses that have been conducted, and the analytical results. Section 4.0 -Sampling and Analysis - discusses the rationale used to select chemicals and media targeted for sampling and analysis, 88B Excavating, Inc., Edwards, Colorado December 17, 1998 Montgomery Pit Facility 39210-003-034 Draft Sampling and Analysis Plan 4 DAMES 8 MooRE