INCREMENTAL SAMPLING METHODOLOGY

Transcription

1 City of Miami Beach, Florida Parcels adjacent to Miami Beach Convention Center Henrietta UrbanGarden 1400 Henrietta Avenue, West Palm Beach, Florida

2 INCREMENTAL SAMPLING METHODOLOGY COCs Areas of concern Phase I ESA Set Objectives Presence or Absence Degree of impact Decision Unit Determination Sampling protocol ISM

3 Parcels adjacent to Miami Beach Convention Center

4 m2 INCREMENTAL SAMPLING METHODOLOGY Parcels adjacent to Miami Beach Convention Center Site A: 2.1 acres Site B: 6.3 acres Monosodium methanearsonate (MSMA) herbicide Arsenic rich fertilizer Contaminant of Concern Arsenic Lead Organochlorine Pesticides Organophosphate Pesticides

5 Slide 4 m2 Expect homogeneity. No source. No specific knowledge of operations. Identify presence or absences. Due tothe nature of the "souce". discrete sampling would be costly and would ultimately yield to the sitewide presence of impacts. mpaituvi, 9/28/2015

6 Parcels adjacent to Miami Beach Convention Center Two Decision Units (DU): eastern part of Site A, and Site B. 32 grid cells on Site A and 31 cells in Site B were established. Sample increments collected at a random location and random depth from surface soil layer within the cell but below the existing asphalt layer

7 Parcels adjacent to Miami Beach Convention Center

8 Parcels adjacent to Miami Beach Convention Center Replicate samples : Replicate samples were at increment locations different from the original samples within the same cell. Replicate samples collected using the same increment locations as the initial sample from each DU to evaluate the accuracy of the laboratory procedures.

9 Parcels adjacent to Miami Beach Convention Center Arsenic concentrations above Miami Dade County s Direct Exposure Residential Soil Cleanup Target Levels (SCTL). Arsenic concentrations above the documented Barrier Islands Naturally Occurring Background Concentration published by Miami Dade County. SUMMARY OF ARSENIC RESULTS Site Sample ID Arsenic (mg/kg) DU Site A DUP DUP DU Site B DUP DUP Miami Dade Direct Exposure Residential SCTL 2.1 Miami Dade Direct Exposure commercial/industrial SCTL 12 Miami Dade Leachability based SCTL *** Barrier Islands Naturally Occurring Background Concentration 5.2 Notes: BOLD Indicates contaminant above Miami Dade SCTL *** Leachability values may be derived using the SPLP Test

10 Parcels adjacent to Miami Beach Convention Center Analytical results for the three replicate samples confirm the consistency of the sampling, preparation, and analytical process and may be indicative of homogeneity within the sample matrix. Site A Site B Mean value (mg/kg) Standard Deviation Coefficient of Variation (CV) Obvious difference between arsenic concentrations on each site. Variability/Dispersion of the results is considered Low for each Site.

11 Parcels adjacent to Miami Beach Convention Center Regulatory Coordination: Off site assessment. Additional groundwater assessment. Redevelopment approach: Soil Management Plan Installation of proper engineering controls: Liner below 12 inches of fill. Two feet of clean fill. Impermeable concrete/asphalt cap.

12 Parcels adjacent to Miami Beach Convention Center

13 1400 Henrietta Henrietta Urban Garden Site Area: 1.5 acres Downtown West Palm Beach The Vision: Urban Garden

14 1400 Henrietta Henrietta Urban Garden Based on the proposed use of the site as a urban garden, testing was recommended to evaluate the potential presence of soil and groundwater impacts associated with historical offsite sources. Incremental Sampling Methodology No onsite contamination sources identified.

15 1400 Henrietta Henrietta Urban Garden One decision unit 31 cells Laboratory analysis included a broad range of potential contaminants including: solvents, metals, petroleum and pesticides. Samples collected from surface soil layer.

16 1400 Henrietta Henrietta Urban Garden Benzo(a) anthracene Benzo(a)pyrene Equivalents FDEP SCTLs Residential FDEP SCTLs Industrial FDEP SCTLs Leachability (mg/kg) ( ) ( ) Notes: mg/kg Milligrams per Kilogram SCTL Soil Cleanup Target Levels ( ) Concentration must be converted to Benzo(a)pyrene equivalent. Sample ID DU 1 DUP Analytical results of replicate samples are consistent Exceedance of Direct Exposure and Leachability regulatory standards. Specific Considerations for Development

17 1400 Henrietta Henrietta Urban Garden

18 INCREMENTAL SAMPLING METHODOLOGY Sample representative of the site conditions when no specific source was identified. Reduces uncertainty and variability. High degree of confidence. Affordable as compared to multiple discrete samples. Facilitate Redevelopment

19 Maria Paituvi, P.E. Senior Engineer 224 SE 9 th Street Fort Lauderdale, FL / Telephone 954/ Fax 305/ Cell mpaituvi@esciencesinc.com Orlando Fort Lauderdale Miami DeLand