ARCHIVED REPORTS_DR OM AGREEMENT 2017 JANUARY

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Quality Assurance Project Plan for Removal Action APN 209-450-03,Mountain House,CA Page 9 for a given sample set. If used, double-blind PE samples will be prepared by Environmental Resources Standards, or a similar supplier, in similar sample containers as the project field samples and shipped from the field to the laboratory for analysis. Double-blind PE samples will be prepared using NIST and/or American Association for Laboratory Accreditation (A2LA) certified standards. The project-specific PE samples will contain known concentrations of the analytes of interest. Laboratory results will be evaluated against the original certificates of analyses for precision and accuracy. PE samples may be submitted for analysis as part of the laboratory pre-qualification process, or as part of a given sampling event. Results will be reported to the laboratory and presented with associated field sample results. Double-blind PE samples are not expected to be used on this project. 6.0 SAMPLING PROCEDURES The defensibility of data is dependent on the use of well-defined, accepted sampling procedures. This section describes the sampling and handling procedures that will be followed for each sampling event. 6.1 FIELD PROCEDURES Collection of environmental samples of high integrity is important to the quality of chemical data generated. To this end, strict field procedures have been developed as general descriptions of field methods that will be employed at various locations during phases of the field investigation. These procedures are contained in the RAW. 6.2 SAMPLE CONTAINERS,PRESERVATION AND HOLDING TIMES Table 1, attached, lists the required sample containers, preservatives, and recommended maximum holding times for samples. The laboratory will provide sample containers. 6.3 SAMPLE HANDLING AND STORAGE In the field, each sample container will be marked with the sampling location number, sampling technician, and date and time of sample collection. All sample containers will be wiped with paper towels and securely packed in a cooler with ice in preparation for delivery to the laboratory. Upon receipt of the samples, the laboratory will immediately notify the Field Manager if conditions or problems are identified which require immediate resolution. Such conditions include, container breakage, discrepancies in the chain-of-custody, exceeded holding times, missing or illegible sample labeling, or temperature excursions. 6.4 SAMPLE CUSTODY For each sample that is submitted to the laboratory for analysis, an entry will be made on a chain-of- custody form supplied by or acceptable to the laboratory. The information to be recorded includes the sampling date and time, sample identification number, matrix type, requested analyses and methods, preservatives (if any), and the sampler's name. Sampling team members will maintain custody of the samples until they are relinquished to laboratory personnel or a professional courier service. The chain-of- custody form will accompany the samples from the time of collection until received by the laboratory. Each party in possession of the samples (except the professional courier service) will sign the chain-of- custody form signifying receipt. The chain-of-custody form will be placed in a plastic bag and shipped with samples inside the cooler. After the samples, ice, and chain-of-custody forms are packed in the CONDOR