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ADVISORY - ACTIVE SOIL GAS INVESTIGATIONS practical and preferred for many geologic materials, and, with care, can be successful in fine-grained soils. 2.2 TECHNICAL DOCUMENTS Each soil gas investigation should have two technical documents: a workplan that describes the investigation in detail, and a report that summarizes the results of the investigation and the analysis of data. The workplan should incorporate the CSM and DQ0s as a framework for the planned investigation. The CSM should be updated during the investigation as data gaps are addressed. 2.3 WORKPLAN A workplan should be prepared and submitted to the regulating agency for review and approval according to the agreed upon schedule. Any variations or deviations from this Advisory should be specified in the workplan. The workplan should include a CSM, sampling and analysis plan (SAP), and DQ0s. The decision making criteria for step-out sampling should be included in the workplan. The workplan should have contingences to address unexpected field conditions, such as larger than anticipated contaminant plumes, low flow or no flow conditions, and resampling when anomalous data are obtained. Anomalous data are defined as data which are inconsistent with the CSM. Additional points may be required to resolve anomalies. The regulating agency should be informed of any problems, unforeseen site conditions or deviations from the approved workplan. If modifications to the approved workplan are going to be implemented, the regulating agency should be notified and provided an opportunity to review the changes prior to implementation. Changes made without prior agency approval should be clearly documented in subsequent reports, including justification for these changes. The project proponent should notify the regulating agency 10 working days prior to implementation of field activities. All necessary permits and utility clearances should be obtained prior to conducting any investigations described in this Advisory. Project tasks and time lines, including dates anticipated for initiating and completing sampling activities, should also be included in the workplan or discussed with the agencies in writing. 2.3.1 Elements of the Workplan Specific information that the regulating agencies will expect to see in a workplan include the following: 1) Site background, including known or inferred extent of contamination, potential or known areas of concern and pertinent features such as existing or former sumps, July 2015 3