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Proiect Number 2098RV45 November 30 2017 5.0 QUALITY ASSURANCE PLAN This section describes field and analytical quality-assurance procedures to be followed during the investigation and remediation. 5.1 Sample Collection and Handling Protocol Proper sample collection and handling are essential to assure quality of data obtained from a sample. Therefore, each soil sample will be collected in a brass or stainless steel tube, each groundwater sample will be collected in VOAs and each soil-gas sample will be collected in a Summa canister. All samples (soil, groundwater and/or soil-gas) will be preserved correctly for the intended analysis and stored for no longer than permissible holding time prior to analysis. 5.2 Sample Identification and Chain-of-Custody Protocol Sample identification and Chain-of-Custody procedures are designed to assure sample quality and to document sample possession from the time it is collected to the time of its ultimate disposal. The container for each sample submitted for analysis will have a label affixed with the identifying number or the number will be inscribed directly on the container. The analytical laboratory will assign a separate sample number unique to that sample for internal sample coordination and identification. A description of the sample including the sample number and other pertinent information regarding its collection and/or geologic significance will be written in field notes and/or a geologic boring log being prepared by the site geologist. These field documents will be kept in a permanent project file. All samples will be analyzed by a state certified laboratory for the analyses requested. A properly completed Chain-of-Custody Form will be submitted to the analytical laboratory along with sample. The laboratory's assigned number will be properly entered on the form. A quality control officer at the lab will verify integrity of samples submitted; proper sample volume, correctness of containers used, and properly executed Chain-of- Custody Form. Pertinent information will be entered into a log book kept by the laboratory. 5.3 Analytical Quality Assurance In addition to routine calibration of analytical instruments with standards and blanks, the analyst is required to run duplicates and spikes on 10 percent of analyses to assure an added measure of reliability and precision. Accuracy is verified through the following: 1. U.S. EPA and State certification of results; 2. Participation in inter-laboratory round robin program; 3. "Blind" samples are submitted for analysis by the quality control officer on a weekly basis; these are prepared from National Bureau of Standards specifications of EPA reference standards; 4. Verification of results with an alternative method. E2C Remediation 16