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C. If moisture or unknown material is observed in the glass bulb or <br /> syringe, soil gas sampling should cease until the cause of the <br /> problem is determined and corrected. <br /> D. If refusal occurs during drilling, soil gas samples should be <br /> collected as follows or in consultation with Agency staff. <br /> 1. For sample depths less than five feet, collect a soil gas sample <br /> following the precautions outlined in Section 2.6.2.B. <br /> 2. For sample depths greater than five feet, collect a soil gas <br /> sample at the depth of refusal. <br /> 3. A replacement probe should be installed within five(5) feet <br /> laterally from the original probe decommissioned due to <br /> refusal. If refusal still occurs after three tries, the sampling <br /> location may be abandoned. <br /> 2.6.5 Chain of Custody Records:A chain of custody form should be <br /> completed to maintain the custodial integrity of a sample. Probe <br /> installation times and sample collection times should be included in <br /> the soil gas report. <br /> 2.7 Analysis of Soil Gas Samples <br /> 2.7.1 Quality Assurance/Quality Control (QA/QC): The soil gas analytical <br /> laboratory should comply with the project Quality Assurance Project <br /> Plan (QAPP) and follow the QA/QC requirements of the most current <br /> ASGI and the employed EPA Method. If there is any inconsistency, <br /> the most restrictive and specific requirements should prevail. The <br /> analytical data should be consistent with the Data Quality Objectives <br /> (DQOs)established for the project. The Agency staff may inspect the <br /> field and/or laboratory QA/QC procedures. Copies of the QA/QC plan <br /> and laboratory calibration data should be presented to the Agency field <br /> staff upon request <br /> Field QC samples should be collected, stored, transported and <br /> analyzed in a manner consistent with site samples. The following QC <br /> samples should be collected to support the sampling activity: <br /> A Sample Blanks <br /> 1. Method Blanks: Method blanks should be used to verify the <br /> effectiveness of decontamination procedures as specified in <br /> Section 2.6.3.B.3 and to detect any possible interference from <br /> ambient air. <br /> 2. Trip Blanks for Off-site Shipments: Whenever VOC samples <br /> are shipped offsite for analysis, a minimum of one(1)trip blank <br /> 01/28/2003 - 14- <br />