9.3 Case Study 3. Former Golf Course Field Demonstration of ISM

Site Name: Former Golf Course

Contacts Names: Kelly Black, Neptune and Company, Inc.; Deana Crumbling, USEPA; Ligia Mora-Applegate, Florida Department of Environmental Protection; Mark Malinowski, California Department of Toxic Substance Control; Phil Goodrum, Cardno ENTRIX; Keith Tolson, Geosyntec Consultants; Ed Corl, NAVFAC Laboratory Quality and Accreditation Office; Hugh Rieck, USACE; Steve Roberts, University of Florida; Leah Stuchal, University of Florida; Richard Lewis, Conestoga-Rovers & Associates, Inc.; Chris Saranko, Environmental Planning Specialists, Inc.

Site Location: Florida

Background: The ITRC ISM Team identified this site for a field demonstration of ISM. The site was a former golf course where both fertilizers and herbicides containing arsenic had been applied. This former golf course will become a residential development. While it was an active golf course, arsenic was applied in two ways. Monosodium methanearsonate (MSMA) was used as a herbicide to stunt the growth of unwanted plant life, mostly on the fairways. Also, arsenic-rich fertilizer was used frequently on the course. Fertilizer was used more heavily on the tee boxes and greens than on the fairways. Arsenic in soils was the media and COC. Preliminary characterization showed that arsenic is the only COC and that it ranges from 0 to nearly 100 mg/kg in some areas, with significant contamination limited to the top 6 inches of soil.

Lessons Learned:

  • Only in cases with strongly skewed or variable data was there much value in collecting more than 30 increments per sample.
  • Discrete samples spanned a much wider concentration range and were more variable than the ISM results.
  • The data collected via discrete samples and the data collected via incremental sampling methods lead to different results and potentially different decisions.
  • Partitioning DUs into subareas may provide an opportunity to discern spatial differences that would not be apparent if incremental samples were collected from the entire DU as a whole.