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to implementation of field activities. All necessary permits and utility clearance(s) should be obtained prior to conducting any investigations described in this Soil Matrix Sampling Advisory. Companion soil matrix sampling may be conducted concurrently with a soil gas The regulating agency staff may request raw data for evaluation either in the field investigation. Soil matrix sampling should be performed pursuant to USEPA or in the office at any time during the investigation. Hard copies of the complete Method 5035 for collection of samples for VOC analysis(CaVEPA,2004). raw laboratory data,including handwritten data and field notes,should be provided to the regulating agency staff upon request. Adjustments or modifications to the sampling program may be required by the regulating agency 2.2 Sol]Gas Investigation Reports: staff to accommodate changes mandated by evaluation of the data or • unforeseen site conditions. The project proponent should keep the following At the conclusion of the soil gas investigation,submit a Soil Gas Investigation guidelines in mind during the course of the investigation. Report(Report)to the regulating agency. The Report should document analytical results,field operations,deviations from the approved workplan,data Sampling and Analysis Plan inconsistencies,and other significant operational details. The Report may either be a stand-alone document in a format recommended by the regulating agency The SAP should have enough flexibility to allow for modifications to be made as or be included within a site-specific assessment report.Reports should also real-time evaluation of analytical test results occurs.. Examples of modifications include a revised CSM based on data obtained from the soil gas investigation. Al include sample density,location and depth. The decision-making criteria for these a minimum,the report should contain the following: adjustments should be included in the SAP. Modifying decisions made in the field should be detailed in the Soil Gas Investigation Report. Field decisions should be made in consultation with the regulating agency. 1. Site plan map and vapor well location map at an appropriate scale as specified in the workplan; Re-sampling should occur at any sampling point where anomalous data are - obtained. Anomalous data are defined as two to three orders of magnitude 2. A map and/or cross-septionaldiagram that depict all contamination found difference from surrounding samples. Additional points may be required to resolve during the soil gas investigation. When sufficient data are available,iso- the spatial distribution of the contaminants within the interval in question. concentration maps should be prepared. Data from previous investigations should be incorporated as appropriate; Investigation Derived Waste 3. Design Drawings:As-buil[diagrams for soil gas wells should be submitted Manage Investigation Derived Waste(IDW)as hazardous waste until proven with the soil gas investigation report detailing the well identification and otherwise or until specifically approved by the regulating agency as being non- corresponding vapor well depths. A typical vapor well construction hazardous waster.Handle and dispose of IDW in accordance with federal,state, diagram may be submitted for vapor wells with common design and and local agency requirements. installation; • Field Variations '4.:'Summary tables for analytical data; A proposal for contingencies should be included in the project workplan to '5. Legible copies of field and laboratory notes or logs; expedite the completion of field activities and to avoid potential project delays. An example of a contingency plan would be a decision criterion V low flow 6. All analytical results and Quality Assurance/Quality Control(QAIQC) conditions are encountered during the proposed soil gas investigation. information including tables and explanation of procedures,results, corrective actions and effect on the data. Upon request,all raw data The regulating agency should be informed of any problems,unforeseen site including chromatograms and calibration data should be submitted to the conditions,or deviations from the approved workplan. When it becomes regulating agency; necessary to implement modifications to the approved workplan,the regulating agency should be notified and provided an opportunity to review the changes 7. Electronic data deliverables submitted in the format specified by the prior to implementation. regulating agency; 3/3/2010 -15- 3/3/2010 -16-