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INTRODUCTION TO RECAP WORKSHOP
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  1. INTRODUCTION TO RECAP WORKSHOP

  2. Louisiana Department of Environmental QualityRisk Evaluation/Corrective Action Program October 20, 2003

  3. RECAP Document Introduction • Overview of program • Use of RECAP General Guidelines • Program terminology • Site ranking system • Site investigation requirements

  4. RECAP Document • Data QA/QC • Data evaluation and useability • Identification of the AOI and COC • Exposure Assessment • AOIC and CC • Land use • Groundwater use • Groundwater POC and POE

  5. RECAP Document • Definitions of SS and RS • Background concentrations • Acceptable risk levels • Identification of toxicity values • Monitored natural attenuation • Institutional controls • Self-implementation • Demonstration of compliance with RS

  6. RECAP Document • Identification of landowners, etc Screening Option Management Option 1 Management Option 2 Management Option 3 Ecological Risk Assessment Soil Re-use

  7. RECAP Document Tables • Table 1 Screening Standards • Table 2 Soil MO-1 RS • Table 3 Groundwater MO-1 RS Figures Appendix A Site Ranking Example Appendix B Site Investigation Requirements

  8. RECAP Document Appendix C RECAP Forms Appendix D • TPH • PAH • Lead • PCDD/PCDF • Conventional parameters

  9. RECAP Document Appendix E NAICS Appendix F Aquifer Tests Appendix G Additivity Appendix H Development/Application of RS Appendix I MO-2 for UST

  10. LDEQ’s RECAP RECAP is a consistent decision-making process for the assessment of, and the response to, environmental contamination that is based on the protection of human health and the environment.

  11. Use of LDEQ’s RECAP • No Further Action at this time determination • Certification of Completion • Corrective Action Plan approval • Approval of a Closure Plan for a Waste Management Unit

  12. Overview of LDEQ’s RECAP • Based on national health risk assessment principles/methods • Tiered framework • Lower tiers • require less information • protective assumptions • generic risk-based levels • often used for screening

  13. Overview of LDEQ’s RECAP • Higher tiers: • require more site information • site-specific EF&T data  Management Option 2 (MO-2) • site-specific EF&T and exposure data  Management Option 3 (MO-3)

  14. Overview of LDEQ’s RECAP • Screening Option • Management Option 1 • Management Option 2 • Management Option 3

  15. Overview of LDEQ’s RECAP  SO*  MO-2 or MO-3   MO-1  MO-3   MO-2   MO-3

  16. Overview of LDEQ’s RECAP Under RECAP, site evaluation is based on the comparison of: an “acceptable” constituent concentration with the constituent concentration at the site

  17. Overview of LDEQ’s RECAP The RECAP document presents the regulations on how the “acceptable” constituent concentration shall be defined and how it will be used to make site management decisions. “Acceptable” Concentration = Screening Standard or RECAP Standard

  18. Overview of LDEQ’s RECAP • Screening Option  SS • Management Option 1  MO-1 RS • Management Option 2  MO-2 RS • Management Option 3  MO-3 RS Refer to Section 2.12 for descriptions of SS and RS

  19. Comparison of SS and RS

  20. LDEQ’s RECAP Two fundamental elements of RECAP: 1. Identification of the appropriate RECAP Standard 2. Estimation of the COC concentration at the site

  21. Step 1 1. Identification of the RECAP Standard

  22. Identification of the RECAP Standard Screening Standards and RECAP Standards are developed for: • protection of human health  RS • prevention of cross-media transfer  RS • protection of resource aesthetics  RS These standards are compared and the lowest is identified as the Limiting Standard

  23. Identification of the RECAP Standard The Limiting Standard is the standard that is applied at the site

  24. Step 2 2. Estimation of the constituent concentration at the site Step 2 consists of two parts: 2a) Identification of the AOI, then 2b) Estimation of the AOI Concentration (AOIC)

  25. Step 2a Step 2a: Identification of the Area of Investigation (AOI)

  26. Step 2b Step 2b: Estimation of the AOI Concentration (AOIC) or Compliance Concentration (CC)

  27. Identification of the AOISection 2.6.1 SOIL Step 2a: Identification of the AOI

  28. Identification of the AOISection 2.6.1 The AOI is the zone contiguous to, and including, impacted media defined vertically and horizontally by the presence of one or more constituents in concentrations that exceed the limiting standard applicable for the option being implemented.

  29. AOI Concentration • Soil • Surface Soil: 0 to 15 ft bgs • Subsurface Soil: > 15 ft bgs

  30. Identification of the AOI • Identify limiting standard for option SO → SS MO-1 → SS MO-2 → SS or MO-1 RS MO-3 → SS, MO-1, or MO-2 RS

  31. Identification of the AOI • If the areal extent of soil impact > 0.5 acre: SO → site-specific SS MO-1 → site-specific SS MO-2 → site-specific SS MO-3 → site-specific SS or MO-2 RS

  32. Identification of the AOI • Compare limiting standard to concentration detected at each sampling location • Identify each location where the concentration > limiting standard • “Connect the dots” to define the horizontal and vertical boundaries of AOI

  33. Identification of the AOILRS = 10 ppm B26 <0.005 B27 <0.005 B28 <0.005 B24 1 ppm B20 2 ppm B21 1 ppm B15 15 ppm B14 18 ppm B4 < 0.005 AOI B5 12 ppm B2 16 ppm B16 1 ppm B1 55 ppm B12 <0.005 B13 29 ppm B6 17 ppm B19 <0.005 B7 <0.005 B3 32 ppm B22 2 ppm B18 2 ppm B11 18 ppm B8 <0.005 B9 22 ppm B10 <0.005 B17 <0.005 B30 <0.005 B25 <0.005 B29 <0.005 B23 <0.005

  34. Identification of the AOI B4 <0.01 B2 14 ppm B14 6 ppm B1 33 ppm B5 <0.01 B16 4 ppm B13 13 ppm B7 <0.01 B3 12 ppm B11 11 ppm B8 2ppm 15’ bgs B18 <0.01

  35. Identification of the AOI The RECAP submittal should: • Illustrate all sampling locations and AOI • Summarize AOI data set

  36. AOI ConcentrationSections 2.8.1 and 2.8.2 Soil Step 2b: Calculation of the AOIC

  37. AOI ConcentrationSections 2.8.1 and 2.8.2 • AOIC → Lower of 95% UCL-AM and Max • 95% UCL-AM • what is it? • why is it used? • other upper bound estimates of mean

  38. AOI ConcentrationSections 2.8.1 and 2.8.2 • AOIC • Based on all data points on or within the AOI • Includes ND on or within the AOI • Does not include data points outside the AOI

  39. Identification of the AOILRS = 10 ppm B26 <0.005 B27 <0.005 B28 <0.005 B24 1 ppm B20 2 ppm B21 1 ppm B15 15 ppm B14 18 ppm B4 < 0.005 AOI B5 12 ppm B2 16 ppm B16 1 ppm B1 55 ppm B12 <0.005 B13 29 ppm B6 17 ppm B19 <0.005 B7 <0.005 B3 32 ppm B22 2 ppm B18 2 ppm B11 18 ppm B8 <0.005 B9 22 ppm B10 <0.005 B17 <0.005 B30 <0.005 B25 <0.005 B29 <0.005 B23 <0.005

  40. AOI Concentration 95% UCL-AM Dataset for the upper bound estimate of the mean: B1 55 ppm B7 0.01 ppm B2 16 ppm B9 22 ppm B3 32 ppm B11 18 ppm B4 0.005 ppm B13 29 ppm B5 12 ppm B14 18 ppm B6 17 ppm B15 15 ppm

  41. ProUCL ProUCL Output for example AOI: • 12 samples within the AOI • Data are normally distributed • Statistical recommendation is Student’s t UCL of 27.1 ppm • Max concentration is 55 ppm • AOIC = 27.1 ppm

  42. Incorrect calculation of AOIC • All data points – within and outside of AOI • Data distribution is non-parametric • 95%UCL-AM is 12.5 ppm

  43. AOI Concentration RECAP submittal should: • Identify the standards used to delineate the AOI • Illustrate the boundaries of the AOI • Identify data points used to calculate 95%UCL-AM • Present spreadsheet/output of software • Identify the value to be used as the AOIC for comparison to RS

  44. Groundwater

  45. Groundwater Classifications Groundwater Classification 1:public water supply • Yield > 4,800 g/d • TDS < 1,000 mg/l Class 1A: current public water supply Class 1B: potential public water supply

  46. Groundwater Classifications Groundwater Classification 2:domestic water supply • Yield > 800 g/d but < 4,800 g/d • TDS < 10,000 mg/l Class 2A: current domestic water supply Class 2B: potential domestic water supply (TDS < 1,000) Class 2C: potential domestic water supply (TDS >1000 but < 10,000)

  47. Groundwater Classifications Groundwater Classification 3: Not a potential public or domestic water supply Class 3A: yield < 800g/d Class 3B: TDS > 10,000 mg/l

  48. Groundwater/Aquifer UseSection 2.10 • Current Use: • DOTD Well Survey (1 mi radius/12 mo) • 500 foot walking receptor survey • Potential Use: • sustainable yield • total dissolved solids

  49. Compliance ConcentrationSection 2.8.3 Groundwater Step 2a: Identification of the AOI (same as for soil) *Note: the AOIC for groundwater is referred to as the Compliance Concentration (CC)

  50. Compliance ConcentrationSection 2.8.3 Groundwater Step 2b:Estimation of AOI Concentration (NOT the same as for soil)