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per day should be collected and analyzed for the target <br /> compounds. Trip blanks, consisting of laboratory grade ultra <br /> pure air, are prepared to evaluate if the shipping and handling <br /> procedures are introducing contaminants into the samples, and <br /> if cross contamination in the form of VOC migration has <br /> occurred between the collected VOC samples. Trip blank <br /> containers and media should be the same as site samples. <br /> B. Duplicate Samples: At least one (1)duplicate sample per <br /> laboratory per day should be field duplicate(s). Duplicate samples <br /> should be collected from areas of concern. <br /> 1. Duplicate samples should be collected in separate sample <br /> containers, at the same location and depth. <br /> 2. Duplicate samples should be collected immediately after the <br /> original sample. <br /> C. Laboratory Control Samples and Dilution Procedure Duplicates: <br /> Laboratory Control Samples(LCS) and Dilution Procedure <br /> Duplicates (DPD) should be done in accordance with the most <br /> recent ASGI (Sections 3.5.0 and 3.12.4, respectively). <br /> D. Split Samples: The Agency staff may request that split samples be <br /> collected and analyzed by a separate laboratory. <br /> 2.7.2 Laboratory Certification: Although the California Department of Health <br /> Services, Environmental Laboratory Accreditation Program(ELAP) <br /> does not currently require certification for soil gas analytical <br /> laboratories, the Agency recommends laboratories utilizing EPA <br /> Methods 8260B, 8021 B, and 8015B for analyses of soil gas samples <br /> obtain ELAP certifications for such EPA analytical methods <br /> accordingly. The Agency or DTSC's Hazardous Materials Laboratory <br /> (HML) staff may inspect the laboratory. <br /> 2.7.3 Detection Limits for Tarqet Compounds:Analytical equipment <br /> calibration should be in accordance with the most current ASGI. <br /> Consideration and determination of appropriate DLs should be based <br /> on the DQOs of the investigation. <br /> A The DL for leak check compounds should be 10µg/L or less (see <br /> Section 2.4.2). The DL for oxygen (02) and carbon dioxide (CO2) <br /> should be one (1) percent or less. The DLs for methane and hydrogen <br /> sulfide are specified in Section 2.7.9. <br /> B. If the investigation is being conducted to delineate the extent of <br /> contamination, a DL of 1 µg/L is appropriate for all targeted VOCs. <br /> 01/28/2003 - 15- <br />