Laserfiche WebLink
TETRA TECH,INC. <br /> 3.2.2 Possible Alternative Actions <br /> Possible alternative actions that may result from answering the primary questions include the following: <br /> • Evaluate the human and environmental health risks associated with COCl at the Site. <br /> • Determine if vapor intrusion mitigation in new construction is necessary. <br /> • Investigate potential alternatives for remediation of COCs at the Site. <br /> 3.2.3 The Decision Statement <br /> Determine what action,if any,is necessary due to releases of COCl at the Site. <br /> 3.3 STEP 3: IDENTIFY INFORMATION INPUTS <br /> 3.3.1 Type of Information Needed <br /> Samples of groundwater, soil, and soil gas must be analyzed to determine the concentrations of COCl <br /> present. Groundwater and soil samples shall be analyzed for TPH in the oil range (TPH-0), TPH-G, <br /> TPH-D,VOCs, and SVOCs. Soil gas samples shall be analyzed for VOCs,SVOCs,and TPH. <br /> 3.3.2 Source of Information <br /> Environmental samples will be collected by Tetra Tech personnel. The selected COCs are based on the <br /> historical use of the Site and sampling results from previous investigations. Analytical data for this <br /> sampling event will be provided by the laboratory subcontractor. <br /> 3.3.3 Determination of Screening Levels <br /> Screening levels were determined based on the Site's location and current and future planned use of the <br /> Site. <br /> 3.3.4 Sampling and Analysis Methodology and Comparison Values <br /> Sampling and analysis will be performed to detect COCs using the EPA SW-846 methodology (EPA <br /> 2008)listed in Table 3-1. <br /> Page 3-2 Sampling Effort Work Plan <br /> Tracy Mansfield Property <br />