Laserfiche WebLink
1 <br /> INC <br /> ' <br /> 20 SURVEY DESIGN (Analyses, Location, Number, Depth, Data Quality Objectives) <br /> ' <br /> 21 Analyses <br /> 1 <br /> Soil gas samples will be analyzed for VOC constituents by EPA method 8260 <br /> 22 Survey Planning <br /> A scale site facility map depicting potential sample locations and possible contaminant <br /> ' source points will be prepared Where possible, a large-scale aerial photograph (scale <br /> 1" = 100' or larger) will be prepared from the most recent imagery available Identifiable <br /> ' landmarks (buildings, street corners, wells, etc ) will be marked on the map A scale bar <br /> and north arrow will be prepared and presented on the site map <br /> 1 <br /> Initial sampling points will be located in areas of potential contaminant sources and in <br /> areas with known soil contamination using an adjustable grid pattern A rationale for the <br /> ' number, location, and depth of sampling points will be provided <br /> Reconnaissance level surveys will be conducted where constituent concentrations, <br /> locations, and depths of contamination are unknown or undetermined Reconnaissance <br /> ' level surveys will be clearly identified as such and data results will be treated with the <br /> relative degree of statistical certainty provided by the volume of data available <br /> dependent objective o u <br /> The density of data sample points will be directly o n the ob j f the survey <br /> and the available time and financial constraints that are in effect <br /> ' Areas where known soil contamination and relatively high VOC concentrations have been <br /> identified to exist may require close-spaced sampling intervals (10 to 20 foot grid intervals) <br /> ' and multi-level sampling (5 to 10 feet vertically between points) by the mobile laboratory <br /> but may be used for field screening during sampling <br /> APPENDIX III <br /> ' 12270020 025 2 <br />