WORK PLANS - Laserfiche WebLink

Home Browse Search

®:� Quality Assurance/Quality Control Plan Martin Metals Finishing Inc. (Former) Stockton, California 3 DATA QUALITY OBJECTIVES The United States Environmental Protection Agency (USEPA) recommends the Data Quality Objective (DQO) process be implemented when data are to be used for regulatory decision making (USEPA, 2006). This section summarizes the seven-step DQO process used to establish performance and acceptance criteria that serve as the basis for the PEA Work Plan. The process was focused on ensuring that the data generated is adequate for its intended purpose, i.e., analytical methods and detection limits are sufficient to compare data against screening levels and standards. Step 1. State the Problem. The problem at the Site is the potential presence of constituents of primary concern (COPCs) in soil and soil vapor including cadmium, chromium, copper, lead, zinc, and volatile organic compounds (VOCs) due to historic plating operations and waste disposal to the storm drain trench and Mormon Slough. As such, the PEA Work Plan proposes(1)sediment sampling within the storm drain, (2)shallow and subsurface soil sampling onsite and offsite along the storm drain and in Mormon Slough, and (3) sub-slab and subsurface soil vapor sampling onsite. Step 2. Identify the Goal of the Study. The overarching goal of the study is to further characterize various media at the Site to facilitate an efficient field effort and determine whether a release or threatened release of hazardous substances at the Site pose a threat to human health or the environment, with the ultimate goal of Site closure certification. Specific questions to be answered in the study include (DTSC, 2015b): • Has a release of hazardous wastes/substances/materials occurred, and has the general extend of contamination been defined? • What is the estimated potential threat and relative risk to public health and/or the environment posed by the Site? • Is interim action required to reduce an existing or potential threat to public health or the environment? • Have data gaps been identified, and what possible remedial action strategies would form the basis for development of a Site strategy? • Is data and information sufficient for DTSC review? Step 3. Identify Information Inputs. A variety of information will be needed to answer the study questions identified in Step 2. The primary sources of information will be from sediment, soil, and soil vapor data: • Field notes from general field and meteorological conditions, sediment sample collection, soil logging and sample collection, and soil vapor probe installation and sampling; CDIM—Fairgrounds Industrial Park Page 4