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Site Characterization

"Identification of Ester Metabolites from Petroleum Hydrocarbon Biodegradation in Groundwater Using GCxGC-TOFMS". O'Reilly, K.T., R.E. Mohler, D.A. Zemo, S. Ahn, A.K. Tiwary, R.I. Magaw, C. Espino Devine, and K. Synowiec. Environmental Toxicology and Chemistry. DOI: 10.1002/etc.3022. 2015.

"Nature and Estimated Human Toxicity of Polar Metabolite Mixtures in Groundwater Quantified as TPHd/DRO at Biodegrading Fuel Release Sites”,  
Zemo, D.A., K.T. O’Reilly, R.E. Mohler, A.K. Tiwary, R.I. Magaw, and K.A. Synowiec. Ground Water Monitoring & Remediation, Vol. 33, No. 4, Fall 2013, pp. 44-56.

“Non-Targeted Analysis of Petroleum Metabolites in Groundwater Using GCxGC-TOFMS”,  Mohler, R.E., K.T. O’Reilly, D.A. Zemo, A.K. Tiwary, R.I. Magaw, and K.A. Synowiec. Environmental Science & Technology, Vol. 47, 2013, pp. 10471-10476.

“Comparison of Shake and Column Silica Gel Cleanup Methods for Groundwater Extracts to be Analyzed for TPHd/DRO”,  Zemo, D.A., K.A. Synowiec, R.I. Magaw, and  R.E. Mohler. Ground Water Monitoring & Remediation, Vol. 33, No. 4, Fall 2013, pp. 108-112.

“Discussion of the ‘Laboratory Analysis and Methods’ Chapter of the California SWB’s 2012 LUFT Manual”. Zemo, D.A. Abstract in Abstract Book for the Twenty-Third Annual AEHS West Coast Conference on Soils, Sediments and Water, March 2013.

“Nature of Polar Compound Mixtures Measured in Groundwater and Reported as Extractable TPH at Biodegrading Petroleum Release Sites”, Zemo, D.A., R.E. Mohler, K.T. O’Reilly, A.K. Tiwary, R.I. Magaw, and K.A. Synowiec. Abstract in Abstract Book for the Twenty-Second Annual AEHS West Coast Conference on Soils, Sediments, and Water, March 2012.

“Comparison of Shake and Column Silica Gel Cleanup Methods for Groundwater Samples Collected at Sites with Biodegrading Petroleum”, Zemo, D.A., K.A. Synowiec, R.I. Magaw, M.S. Bauer, D.J. Noel, and R.E. Mohler. Abstract in Abstract Book for the Twenty-Second Annual AEHS West Coast Conference on Soils, Sediments, and Water, March 2012.

“Nature and Estimated Toxicity of Polar Compound Mixtures Measured in Groundwater at Petroleum Release Sites and Reported as “TPHd/DRO” ”.  Zemo, D., K. O’Reilly, R. Mohler, A. Tiwary, R. Magaw, and K. Synowiec.  Abstract in Abstract Book for the SETAC North America 32nd Annual Meeting, November 2011; and in Abstract Book for the 18th Annual International Petroleum Environmental Conference (IPEC), November 2011.  

“Occurrence of Polar Organic Compounds in Groundwater Resulting from Biodegradation – Implications for Petroleum Site Investigations and Remediation”.  Munzar, S., D. Zemo, R. North, and J. Mair.  Abstract in First Annual Science Advisory Board for Contaminated Sites in British Columbia (SABCS) Conference on Contaminated Sites, September 2011; and in ESAA Canada Remediation Technologies Symposium (RemTec), October 2011.  

“Evaluation of Polar Compounds in Groundwater Resulting from Biodegradation of Petroleum that are Measured as “Total EPH” – Summary of Available Information”. Zemo, D.A.  Abstract in First Annual Science Advisory Board for Contaminated Sites in British Columbia (SABCS) Conference on Contaminated Sites, September 2011.

“Suggested Methods to Mitigate Bias from Nondissolved Petroleum in Groundwater Samples Collected from the Smear Zone”
, Zemo, D.A., Ground Water Monitoring & Remediation, Summer 2009, pp. 77-83.  

“Suggested Methods to Mitigate Bias from Non-Dissolved Petroleum in Groundwater Samples”, Zemo, D.A., Abstract in Proceedings of the Eighteenth Annual AEHS West Coast Conference on Soils, Sediments and Water, March 2008.  

“Is it Petroleum? More Lessons Learned about “TPH” False Positives”, Foote, G.R. and D.A. Zemo,  Abstract in Proceedings of the Eighteenth Annual AEHS West Coast Conference on Soils, Sediments and Water, March 2008.  

"Use of Laboratory Partitioning Tests to Evaluate the Dissolved Phase in Groundwater Beneath Floating Product",  Zemo, D.A., R.L. Miller, R. Gardner and T.E. Graf. Abstract in Proceedings of the Seventeenth Annual AEHS West Coast Conference on Soils, Sediments and Water, March 2007.  

“Toward a Better Measurement of Mobile Petroleum Hydrocarbon Concentrations in Ground Water Systems”, Foote, G.R., D.A. Zemo, K. Johnson, J.E. Bruya and C Morrow.  Abstract in Proceedings of the 2006 Petroleum Hydrocarbons and Organic Chemicals in Groundwater Conference, NGWA/API.  

“Sampling in the Smear Zone: Evaluation of Nondissolved Bias and Associated BTEX, MTBE, and TPH Concentrations in Ground Water Samples”, Zemo, D.A., Ground Water Monitoring & Remediation, Summer 2006, pp. 125-133.  

“Evaluation of Non-Dissolved Bias in Groundwater Samples Collected from Monitoring Wells and Direct-Push Borings within the Smear Zone at Gasoline Release Sites”, Zemo, D.A., Proceedings of the 2006 North American Environmental Field Conference: Nielsen Environmental Field School.  

“Sampling in the Smear Zone: Evaluation of Non-Dissolved Bias and Associated BTEX, MTBE and TPH Concentrations in Groundwater Samples”, Zemo, D.A. Proceedings of the 2005 Petroleum Hydrocarbons and Organic Chemicals in Groundwater Conference, NGWA/API, pp. 118-135.  

"Assessment of Filtering and Centrifuging on Dissolved Semi-Volatile Petroleum Hydrocarbons", Foote, G.R., K. Johnson, D.A. Zemo, J.E. Bruya and C. Morrow. Abstract in Proceedings of the Fifteenth Annual AEHS West Coast Conference on Soils, Sediments and Water, March 2005.  

“The Technical Case for Eliminating the Use of the TPH Analysis in Assessing and Regulating Dissolved Petroleum Hydrocarbons in Groundwater,” Zemo, D.A and G.R. Foote.  Ground Water Monitoring & Remediation, Summer 2003, pp. 95-104.  

“Hydrochemical Changes in a DNAPL Source Area from Enhancing Microbiologically-Mediated Degradation of VOCs,” Honniball, J.H., D.A. Zemo, T.A. Delfino, S.D. Warner, and J.A. Mescher. Proceedings of the Eleventh Annual West Coast Conference on Contaminated Soils, Sediments and Water, The Association for Environmental Health and Sciences, March 2001.  

“Reality Check? Soil Vapor Data Applied to Evaluation of Chemical Migration from Groundwater to Air,” Holbrow, A.M., G.P. Brorby, and D.A. Zemo.  Abstract in Proceedings of the Tenth Annual West Coast Conference on Contaminated Soils, Sediments and Water, AEHS, March 2000.  

“Do Your Extractable TPH Concentrations Represent Dissolved Petroleum? An Update on Applied Research,” Zemo, D.A. Proceedings of the 1997 Petroleum Hydrocarbons and Organic Chemicals in Ground Water Conference, NGWA/API, pp. 640-654.  

“Measurement of Dissolved Petroleum in Groundwater: Pitfalls of TPH Analyses,” Zemo, D.A.  In: Contaminated Soils, Vol. 2; Amherst Scientific Publishers, 1997, pp. 41-50.  

“Case Study: Interferences with TPH Analyses of Grab Groundwater Samples,” Foote, G.R., D.A. Zemo, S.M. Gallardo, M.J. Grant, B.T. Benson, and J.E. Bruya. In: Principles and Practices for Diesel Contaminated Soils, Vol. 6; Amherst Scientific Publishers, 1997, pp. 27-39.
  
"White Paper: Recommended Analytical Requirements for Soil and Groundwater Affected by Petroleum Hydrocarbons,” Zemo, D.A., T.E. Graf, J.W. Embree, J.E. Bruya, and K.L. Graves. Submitted to the California State Water Resources Control Board, LUFT Revision Technical Advisory Committee, June 1995. 

 "TPH Detections in Groundwater: Identification and Elimination of Positive Interferences,” Zemo, D.A. and K.A. Synowiec. Proceedings of the 1995 Petroleum Hydrocarbons and Organic Chemicals in Ground Water Conference, NGWA/API, pp. 257-271.  

"Field Comparison of Analytical Results from Discrete-Depth Groundwater Samplers: BAT Enviroprobe and QED Hydropunch,"
Zemo, D.A., T.A. Delfino, J.D. Gallinatti, V.A. Baker, and L.R. Hilpert. Ground Water Monitoring & Remediation, Winter 1995, pp. 133-141.  

"Cone Penetrometer Testing and Discrete-Depth Groundwater Sampling Techniques: A Cost-Effective Method of Site Characterization in a Multiple Aquifer Setting,"
Zemo, D.A., Y.G. Pierce, and J.D. Gallinatti.  Ground Water Monitoring & Remediation, Fall 1994, pp. 176-182.
 
"Methodology for the In-Field Design of Monitoring Wells in Heterogeneous Fine-Grained Formations."
Reynolds, S.D. and D.A. Zemo. In: Current Practices in Ground Water and Vadose Zone Investigations: ASTM Special Technical Publication No. 1118, 1992.  

“Methodology for the In-Field Design of Monitoring Wells". Abstract in AAPG Pacific Section Annual Meeting, May 1992.

Forensics

 “Using Parent PAH Proportions to Attribute PAH Sources in Sediments”, Zemo, D.A.  Abstract in Environmental Forensics in an Era of Emerging Diagnostic Methods.  California Groundwater Resources Association Sixth Symposium in the Series of Tools and Technologies, April 2011.

“Use of Parent PAH Proportions to Attribute PAH Sources in Sediments: A Case Study from the Pacific Northwest”, Zemo, D.A., Environmental Forensics, September 2009, pp: 229-239.  

“Use of Parent PAH Proportions to Attribute Source of PAHs in Sediments”, Zemo, D.A., Abstract in Proceedings of the Eighteenth Annual AEHS West Coast Conference on Soils, Sediments and Water, March 2008.  

“Forensic Tools for Petroleum Hydrocarbon Releases”, Zemo, D.A., Southwest Hydrology, July/August 2007, pp. 26, 27, 35.  

“Sampling in the Smear Zone: Forensic Evaluation of ‘Dissolved’ BTEX and MTBE Data”.  Abstract in Proceedings of the Fifteenth Annual AEHS West Coast Conference on Soils, Sediments and Water, March 2005.  

“Practical Challenges to Developing Forensic Interpretations Using ‘Real-World’ Data Typically Available at Petroleum Hydrocarbon Release Sites”, Zemo, D.A.  Proceedings of the 2002 Petroleum Hydrocarbons and Organic Chemicals in Ground Water Conference, NGWA/API, pp. 425-433.  

“Challenges in Developing Forensic Interpretations Using Only Existing Site Data”. Abstract in Proceedings of the Eleventh Annual West Coast Conference on Contaminated Soils, Sediments and Water, AEHS, March 2001.  

“Use of Forensic Chemistry in Petroleum Investigations: Case Studies” (with J.E. Bruya). Abstract in Proceedings of the Annual meeting of the American Academy of Forensic Sciences, 1999 Conference.  

“Applications of Forensic Chemistry for Petroleum Cases”.  Abstract in Program of the 1999 American Association of Petroleum Geologists Annual Convention.  

“Winning with Forensic Chemistry: An Environmental Consultant’s Perspective on Petroleum Cases”. Abstract in Proceedings of the Annual Meeting of the American Academy of Forensic Sciences, 1998 Conference.  

“An Environmental Consultant’s Perspective on the Successful Use of Forensic Chemistry for Petroleum Cases,” Zemo, D.A.  Proceedings of the Fifth Annual International Petroleum Environmental Conference, October 1998.  

"The Application of Petroleum Hydrocarbon Fingerprint Characterization in Site Investigation and Remediation," Zemo, D.A., J.E. Bruya, and T.E. Graf.  Ground Water Monitoring & Remediation, Spring 1995, pp. 147-156.

Risk Evaluation/Regulatory Closure

“Reference Dose (RfD) Based Chronic Human Health Hazard Ranking System for Complex Mixtures – Assessment of Polar Metabolites in Groundwater at Biodegrading Petroleum Sites”. Tiwary, A.K., R.I. Magaw, D.A. Zemo, K.T. O’Reilly, R.E. Mohler, and K.A. Synowiec.  Abstract in Program of the 52nd Annual Meeting of the Society of Toxicology, March 2013.  

“Potential Human Toxicity of Polar Compounds Measured in Groundwater and Reported as Extractable TPH at Biodegrading Petroleum Release Sites”, Tiwary, A.K., R.I. Magaw, D.A. Zemo, K.T. O’Reilly, R.E. Mohler, and K.A. Synowiec. Abstract in Abstract Book for the Twenty-Second Annual AEHS West Coast Conference on Soils, Sediments, and Water, March 2012.

“What’s My Risk?  An Innovative Approach to Assessing Health Risks in an Established Neighborhood”, Brorby, G.P. and D.A. Zemo. Proceedings of the 1999 Petroleum Hydrocarbons and Organic Chemicals in Ground Water Conference, NGWA/API, p. 283.  

“Cutting Through the Regulatory Maze Toward Site Closure,” Brorby, G.P. and D.A. Zemo. In: Contaminated Soils, Vol. 3, Amherst Scientific Publishers, 1998, pp 1-9.  

“An Argument Against Developing TPH-based Tier 1 Ecological Screening Values to Evaluate Petroleum Hydrocarbon Releases to Soil and Groundwater,” Brorby, G.P., L.B. Job, A.L. Spencer, and D.A. Zemo.  Proceedings of the 1998 Petroleum Hydrocarbons and Organic Chemicals in Groundwater Conference, NGWA/API, pp. 334-338.  

“Roadmap for Closure: Development and Implementation of a Risk-Based ‘Consistent Approach’ for a Pipeline System,” Zemo, D.A., G.P. Brorby, M.B. Bloes, and J.L. Jefferson. Proceedings of the Fifth Annual International Petroleum Environmental Conference, October 1998.  

“Caught in a Regulatory Maze?” Brorby, G.P. and D.A. Zemo. Soil and Groundwater Cleanup, June 1998, pp.20-23.  

"The Changing Approach to Investigating, Remediating, and Regulating Petroleum Hydrocarbons in the Environment,” Zemo, D.A. California Environmental Compliance Monitor, Vol. 5. No. 6; 1995, pp. 224-226.

Other

Investigation of the Geochemistry and Consolidation Properties of the Cretaceous -Tertiary Boundary in Alabama, Mississippi and Tennessee,” [Master's Thesis], Zemo, D.A.  Abstract in GSA Abstracts with Programs, Vol. 15, No. 2, 1983, p.57.  

“Delineation and Description of the Regional Aquifer Systems of Tennessee: Cumberland Plateau Aquifer System," Brahana, J.V., J. Macy, D. Mulderind, and D.A. Zemo.  U.S. Geological Survey - Water Resources Division Open File Report 82-338, 1982.


Site Characterization

“Nature and Estimated Human Toxicity of Polar Compound Mixtures in Groundwater Reported as Extractable ‘TPH’ at Biodegrading Petroleum Release Sites”. Presentations to the California Regional Water Quality Control Boards (Central Valley- February 2012, North Coast- May 2012, San Francisco Bay- June 2012 and June 2015, Central Coast- October 2012 and May 2015, Los Angeles- April 2013, San Diego- March 2015,), and (with A. Tiwary) to the California Dept of Toxics Substances Control, Human and Ecological Risk Division, May 2012, and to the California State Water Board, August 2012.  Presentations also to the NW and SW Regions, and Headquarters of Washington Dept of Ecology, 2013 and 2015; California Unified Program (CUPA) Annual Training Conference, 2014 and the Alaska Dept of Environmental Conservation in 2014, Hawaii Dept of Health in 2014, Utah DEQ in 2014 and British Columbia CSAP in 2014.

“Silica Gel Cleanup Prior to TEPH Analysis: What is it? Why is it needed?”  Presentation to the California SWRCB UST Program Technical Roundtables for Regional Water Quality Control Boards and Local Oversight Programs, August 2011. 

“Preliminary Evaluation of Polar Non-Hydrocarbons in Groundwater Resulting from Biodegradation of Petroleum Hydrocarbons.”  Abstract and lecture for California Groundwater Resources Association (GRA) Section Meetings on June 15 (San Francisco Bay), August 17 (Southern California), and September 14 (Sacramento), 2011. 

“Updated California LUFT Manual” (with SWRCB staff). Workshops presented at the AEHS West Coast Conference on Contaminated Soil, Sediments, and Water, March 2010 and March 2011; and at the California Unified Program (CUPA) Annual Training Conference, February 2010. 

“Petroleum and TPH: A Discussion of Technical Issues with a Focus on Groundwater Data”. Workshop presentation for the Regional Water Quality Control Boards – San Francisco Bay Region, June 2007 and Lahontan Region, August 2008.

"Introduction to Borehole Geophysics for Groundwater Investigations" (with S.D. Reynolds). Lecture and notes for UC Davis Extension Course in Geophysical Instrumentation, June 1992.

Forensics

“Environmental Forensics: Tools and Applications for Petroleum and Chlorinated Solvents”.  Lecture at the California Groundwater Resources Association (GRA) San Francisco Bay Section Meeting, April 2006.

“Forensic Interpretation of Typical Petroleum Hydrocarbon and Oxygenate Analytical Data”. Lecture and notes for International Society of Environmental Forensics workshop titled Overview and Application of Environmental Forensics in Soil and Groundwater, November 2003.

“Challenges in Developing Forensic Interpretations Using Only Existing Site Data”. Lecture and notes for University of Wisconsin Madison Extension Short Course titled Environmental Litigation: Advanced Forensics and Legal Strategies, April 2000 and April 2001.  

“Petroleum Hydrocarbons: Chemistry, Fingerprinting, and Emerging Analytical Methods” (with J.E. Bruya). Workshop presented at the Tenth and Eleventh National Outdoor Action Conference(s); NGWA, May 1996 and May 1997 and the 1997 and 1998 Petroleum Hydrocarbons and Organic Chemicals in Ground Water Conference(s); NGWA/API.  

“Use of Petroleum Fingerprinting in the Development of Remedial Strategies" (with J.E. Bruya). Workshop presented at the Eighth and Ninth National Outdoor Action Conference(s); NGWA, May 1994 and May 1995.

Risk Evaluation/Regulatory Closure

"TPH Screening Levels - National Trends". Workshop presented at AEHS West Coast Conference, March 2015.

“Update on Petroleum Hydrocarbon Issues in California and Implications for Site Closure” (with G.R. Foote, G.P. Brorby, A. Holbrow, and K. Graves). Workshop presented at Tenth and Eleventh Annual West Coast Conference(s) on Contaminated Soils, Sediments and Water, AEHS, March 2000 and March 2001.  

“Practical Guidance for Risk-Based Closure of Sites Impacted by Diesel Fuel and Other Petroleum Hydrocarbons” (with G.P. Brorby, G.R. Foote, and A.C. Nye). Workshop presented at the Seventh Annual West Coast Conference on Contaminated Soils and Groundwater; AEHS, March 1997 and the Twelfth Annual Conference on Contaminated Soils; AEHS, October 1997.  

“Application of Petroleum Hydrocarbon Fingerprinting in Regulatory Decision-Making" (with J.E. Bruya). Workshop presented at California State Water Resources Control Board UST Roundtable, October 1994.

   
 
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