Laserfiche WebLink
WORK PLAN FOR ADDITIONAL SOIL VAPOR SURVEY <br /> Proposed Assessment Activities <br /> May 30, 2014 <br /> b EPA Method 8015M or TO-15 reference to a gasoline standard <br /> TPHg will be analyzedy ( <br /> with molecular weight equal to 100). VOCs will be analyzed by EPA Method TO-15. <br /> 3.7.3 Fixed Gases <br /> Soil vapor samples will be analyzed for fixed gases including oxygen, carbon dioxide, <br /> nitrogen, methane and the tracer gas (helium) using ASTM D1946. <br /> 3.7.4 Data Evaluation <br /> One hundred percent of the laboratory-generated data will be subjected to electronic <br /> data review for each of the items listed below. Data contained within the standard <br /> laboratory data packages will undergo verification/validation to verify that the data is <br /> complete and defensible. <br /> The review will include the following: <br /> • Laboratory reports and chain-of-custody documentation to check for errors and <br /> omissions. <br /> • Laboratory case narratives to check for anomalies and exceedance of QA/QC <br /> requirements. <br /> • Laboratory reports to check for correct reporting limits and units. <br /> • Holding times. <br /> • Method blank to note any detected analytes and their respective <br /> concentrations. <br /> • Surrogate compounds, their spiking levels, the reported concentrations, and the <br /> percent recoveries. <br /> • Performance control samples, their spiking levels, determined concentrations, <br /> and percent recoveries. <br /> • Laboratory duplicate samples, field duplicate samples, and relative percent <br /> difference (%RPD). <br /> 3.8 SURVEYING OF SOIL VAPOR PROBE LOCATIONS <br /> The newly-installed soil vapor probe locations will be surveyed for horizontal and vertical <br /> controls by a State of California licensed land surveyor or civil engineer in accordance <br /> with a datum (benchmark) accepted by the California State Water Resources Control <br /> Board-GeoTracker System. The survey data (X, Y, Z) will be uploaded in the <br /> GeoTracker database. The center top of each vapor probe protective surface box will <br /> be surveyed and its vertical elevation will be determined to an accuracy of 0.01 foot. <br /> 3.9 INVESTIGATION-DERIVED WASTE MANAGEMENT <br /> Investigation-derived waste (soil cuttings, decontamination water, etc.) generated will <br /> be containerized in 55-gallon steel Department of Transportation (DOT)-approved <br /> 3.10 <br />