Pollution Engineering - September 2008 - (Page 39)

the sampling plan from the very beginning of the investigation at an environmental site. The FPXRF allows the mapping of specific COCs and associated indicator elements across the site in one sampling event, increasing efficiency while reducing mobilization costs. It allows a more intense sampling where the COCs are concentrated, delineating both the source(s) and the dispersion from source(s). Using EPA Method 6200 and these COC maps, truly representative samples are collected from both the delineated anthropogenic and natural background areas within the site. Since XRF is a non-destructive analytical method, the representative samples sent to the laboratory are the same samples analyzed by the FPXRF, documenting the quality of the FPXRF analytical data. Both the laboratory and the FPXRF data can then be used for the statistical methods and for risk analysis. Adding in the FPXRF data significantly increases the number of samples used in the statistical methods, so the confidence levels are higher than the significantly fewer poorly “ …the FPXRF still achieves a relatively low cost budget because most of the extensive sampling plan development occurs in the field, not in offices remote from the site. defined samples available using the conventional sampling method. Teams make a difference GLANZMAN: The new paradigm can now include some senior staff with a group of more junior people that can do a reconnaissance with an XRF analyzer and then develop a sampling plan with known objec- ” tives. This is in contrast to taking only a few samples, then using costly laboratory tests to get very accurate readings. Under conventional sampling plans, this is followed by multiple rounds of looking at the site and more lab testing could be avoided with the new approach by carefully sampling in-situ with XRF tests and selecting the bagged soil samples for lab testing. The junior staff uses the FPXRF to analyze, collect and bag samples on a grid pattern, noting locations frequently augmented by GPS. For statistical significance, you need many samples to achieve appropriately high confidence levels needed for risk assessment. For this, you need data of known quality to add to the lab results and the FPXRF still achieves a relatively low cost budget because most of the extensive sampling plan development occurs in the field, not in offices remote from the site. This is where XRF field tests let you fill in with data of known quality. Summary and conclusions One of the most important benefits of Visit us at WEFTEC ‘08, Booth# 32120 MADE IN USA Since 1957 ACCURACY RELIABILITY SIMPLICITY Test critical water parameters at every step with Myron L water quality instruments. Quickly and Accurately measure: CONDUCTIVITY RESISTIVITY TDS ORP PH TEMPERATURE See our full line of quality instruments at www.myronl.com 2450 Impala Drive Carlsbad, CA 92010 Tel: 760-438-2021 Fax: 760-931-9189 PLE09084MYRO.indd 1 8/12/08 8:47:33 39 SEPTEMBER2008 www.pollutionengineering.com AM http://www.myronl.com http://www.myronl.com http://www.pollutionengineering.com

Table of Contents Feed for the Digital Edition of Pollution Engineering - September 2008

Pollution Engineering - September 2008 Contents The Editor’s Desk Reader Comments EnviroNews PE Events Legal Lookout Environmental Management The Green Files Guest Dialog 500-Year Storm Control How Do You Clean Up 100 Years of Pollution? SPCC: Don’t Wait and See The Next Wave in Air Purification An Invitation to the Windy City Flood Control Infrastructure Saves ‘Green’ Puts a New Spin on Pest Control Instrumentation Products Material Safety and Storage Equipment PE Products Classified Marketplace Advertisers Index State Rules

Pollution Engineering - September 2008

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