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CONTENTS
Section
Page
1.0 INTRODUCTION...............................................................................................................................1
2.0 BACKGROUND................................................................................................................................ 2
3.0 SUBJECT PROPERTY DESCRIPTION............................................................................................3
3.1 LOCATION AND LEGAL DESCRIPTION.......................................................................................... 3
3.2 CURRENT USE OF SUBJECT AND ADJOINING PROPERTY........................................................4
3.3 PHYSICAL SETTING ........................... .............. ..... ............ ..................... .......... .... .......... ......._......... 5
4.0 HISTORICAL SITE ASSESSMENT ACTIVITIES..............................................................................5
5.0
CURRENT SITE ASSESSMENT ACTIVITIES..................................................................................7
5.1
SUMMARY OF GEOPHYSICAL INVESTIGATION...........................................................................7
5.2
MONITORING WELL INSTALLATION...............................................................................................8
5.3
GROUNDWATER SAMPLE COLLECTION AND ANALYSIS............................................................
9
6.0
QUALITY ASSURANCEIQUALITY CONTROL..............................................................................11
7.0
CONCLUSIONS AND RECOMMENDATIONS................................................................................12
7.1
CONCLUSIONS..............................................................................................................................
12
7.2
RECOMMENDATIONS .............. .................................................................. .......... .........................
12
LIST OF APPENDICES
AppendixA.......................................................................................................................... Figures
AppendixB........................................................................................................................... Tables
AppendixC ............................. ...................................................................................... FDEP Logs
Appendix D .................................... Laboratory Analytical Reports and Chain of Custody Records
LIST OF FIGURES
Figure1................................................................................................... USGS Site Location Map
Figure 2............................................................................................Monitoring Well Location Map
Figure 3 ............................................. Groundwater Sampling Locations with Analytical Data Map
LIST OF TABLES
Table 1.................................................................................. Monitoring Well Construction Details
Table 2.......................................................................... Summary of Groundwater Analytical Data
Submitted into the public
ii
record in connection with
item PZA on 10-08-09
Priscilla A. Thompson
City Clerk
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Summary of Limited CAPA Implementation
Former Virqinia Key Landfill
1.0 INTRODUCTION
Bureau Veritas Project Number 144456
July 2, 2009
Intercounty Laboratories-USL, Inc., dba Bureau Veritas North America, Inc. (Bureau Veritas)
was retained by the City of Miami (the City) to implement a portion of the Contamination
Assessment Plan (CAP) with modifications in accordance with the Bureau Veritas Proposal
Number 93-04-829-R3, dated November 15, 2006 for the Former Virginia Key Landfill Site, as
depicted on Figure 1, Appendix A.
A CAP Addendum (CAPA) was submitted to Department of Environmental Resources
Management (DERM) on October 9, 2007. In a DERM letter dated December 20, 2007,
comments regarding the CAP were provided to the City and Bureau Veritas. A revised CAPA,
dated February 18, 2008 was prepared to address the DERM comments and provided a revised
work plan augmented by the use of geophysical methods to provide a targeted approach for
proposed assessment activities at the subject property. A geophysical investigation was initiated
at the site on April 16, 2008, the results of which were submitted to the DERM on September
17, 2008 with supplemental information dated December 12, 2008. The DERM approved the
CAP with modifications via letter dated February 2, 2009.
The intent of this limited assessment was to obtain groundwater quality data at the perimeter of
the site to evaluate the likelihood that groundwater remediation will be required, and to the
extent possible provide an opinion of cost for potential remedial strategies to provide the City
with the necessary information to evaluate their financial risk regarding the project.
Submitted into the public
record in connection with
item PZA on 10-08-09
1 Priscilla A. Thompson
City Clerk
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Summary of Limited CAPA Implementation 'ESB Bureau Veritas Project Number 144456
Former Virginia Key Landfill July 2, 2009
2.0 BACKGROUND
The subject property consists of an approximately 124 -acre parcel which operated as a
municipal dump from at least 1961 through 1978. The municipal dump did not operate as a
permitted solid waste facility until 1975, at which time a temporary operations permit (TOP ST -
13 -014) was issued by the Florida Department of Environmental Protection (FDEP) to the City
of Miami for the facility. Based on a review of regulatory files, open burning was common
practice at the subject property from 1965 through 1972. In 1973, inspections of the subject
property documented the dump in poor to fair condition with uncovered waste. Similar
conditions were detailed in inspection reports until the closing of the dump in 1978.
According to information obtained during the Phase I Environmental Assessment conducted by
Bureau Veritas (see Phase I Environmental Assessment Report dated August 2, 2007), waste
accepted at the site included the following items: construction and land clearing debris, yard
trash, junk cars and boats, household furniture, herbicides, biomedical wastes, street
sweepings, incinerator ash, and wastewater treatment sludge. Prior to the aforementioned
landfill activities, the subject property contained a surface water body (Duck Lake) which
encompassed approximately 26 acres in the northern portion of the site.
Monthly reports were submitted to the Department of Environmental Resources Management
(DERM) and FDEP prior to and during 1977 detailing the waste dumping operations. Based on
the FDEP temporary permit, the dump was scheduled to close on July 1, 1977. Due to the delay
in constructing a waste transfer station, Consent Order Number 93 was executed between the
City of Miami and FDEP allowing the dump to close on April 15, 1978; however, due to further
delays, the City did not close the landfill until May 29, 1978. As part of Consent Order #93, the
City had to develop a Closure Plan in accordance with Section 17-7.07, Florida Administrative
Code (FAC), which included a Groundwater Monitoring Plan, a topographical survey and cross
sectional view of the landfill, and the installation of a two -foot cap with specific requirements for
sloping and ground cover. The Closure Plan was subsequently approved by the FDEP. The
Groundwater Monitoring Plan required the installation and sampling of four groundwater
monitoring wells located on the northern, southern, eastern, and western portions of the subject
property. The results from the groundwater sampling indicated that concentrations of ammonia
Submitted into the public
j record in connection with
item PZ.1 on 10-08-09
2 Priscilla A. Thompson
City Clerk
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Summary of Limited CAPA Implementation Bureau Veritas Project Number 144456
Former Virginia Key Landfill July 2, 2009
and dissolved solids were consistently above groundwater cleanup target levels (CTLs), and
select metals were also periodically detected above CTLs. According to a memo from the City,
the dump was no longer being used as of May 29, 1978 and a DERM inspection on March 12,
1980 verified that the cover was in place and no more dumping had occurred.
3.0 SUBJECT PROPERTY DESCRIPTION
3.1 LOCATION AND LEGAL DESCRIPTION
The subject property, owned by the City of Miami, located at the northeast corner of Sewage
Plant Road and Arthur Lamb Jr. Road, Virginia Key in Miami, Miami -Dade County, Florida, is an
area generally characterized by commercial development and undeveloped open space. The
subject property consists of portions of the following four folios/parcels with the associated legal
descriptions:
Folio Number
Legal Description
01-4216-000-0040
16 54 42 148.09 AC ALL S1/2 LYING WITHIN OLD MEANDER LINE LESS
S100FT & LESS BEG 1520FTE & 2375FTSLY OF NW COR OF SEC TH
E18.2FT S25FT W8.2FT S191.3FT E336.4FT S 30 DEG E 20FT
01-4216-000-0070
16 54 42 2.20 AC M/L BEG 1520FTE & 2375FTSLY OF NW COR OF SEC TH
E18.2FT S25FT W8.2FT S19.1.3FT E336AFT S 30 DEG E 20FT S 60 DEG W
394.2FT S394.2FT W20FT N394.2FT N 60 DEG W 394.2FT
01-4216-000-0050
16 54 42 85.34 AC M/L NW1/4 LESS BEG 125OFTE OF NW COR OF SEC
CONT E1390FT S2340FT W1390FT N2340FT TO POB
01-4216-000-0011
16 52 42 82.12 AC ALL FRACTIONAL NE1/4 LYG WITHIN OLD MEANDER
LINE LESS BEG 3455FTE & 1720.37FTS OF NW COR OF SEC TH E94.50FT
S230FT W94.50FT N230FT TO POB & LESS BEG 3450FTE OF NW
Submitted into the public
record in connection with
item PZ.1 on 10-08-09
3 Priscilla A. Thompson
City Clerk
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Summary of Limited CAPA Implementation K Bureau Veritas Project Number 144456
Former Virginia Key Landfill July 2, 2009
3.2 CURRENT USE OF SUBJECT AND ADJOINING PROPERTY
The subject property is generally unimproved and covered with overgrown vegetation. A portion
of the subject property in the northwest is used to house a radio tower. The area surrounding
the subject property consists of mixed land uses. These land uses include undeveloped open
space, public recreation space, a sewage treatment plant, public marine services, and
commercial services. The uses and features of adjoining properties are described as follows:
North: Central District Wastewater Treatment Plant followed by Norris Cut (Biscayne Bay)
East: Arthur Lamb Jr. Road followed by Virginia Key Beach Park and the Atlantic Ocean
South:Arthur Preserve
West: Sewage Plant Road
Currently, the City of Miami is in the Preliminary Master Planning Phase 'of the Virginia Key
Master Plan, a redevelopment effort of Virginia Key with devoted financial and planning
contributions from. the City of Miami and Miami -Dade County. This limited assessment is an
integral component of the Virginia Key Master Plan. The purpose of the Master Plan is to
develop available waterfront property with public open spaces, integrate waterfront use policies,
develop and manage Virginia Key while providing protection and improvements of the natural
resources with the appropriate infrastructure to regulate traffic flow and to serve future
development of the Marine Stadium property on the island. The process of the Virginia Key
Master Plan includes the following phases:
• Research and Data Collection
• Community Information Meetings
• Preliminary Master Planning
• Final Master Planning
• Project Documentation and Administration
In addition, the Virginia Key Master Plan will focus on the improvement of the island for mixed-
use waterfront development, improvement to the Central District Wastewater Treatment Plant,
and preservation of Historic Virginia Key Beach Park.
Submitted into the public \
record in connection with
item PZ.1 on 10-08-09
4 Priscilla A. Thompson
City Clerk
U
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Summary of Limited CAPA Implementation Bureau Veritas Project Number 144456
Former Virginia Key Landfill July 2, 2009
3.3 PHYSICAL SETTING
The subject property is located in the Atlantic Coastal Ridge Physiographic Region of Florida.
The general area is characterized by a ridge of sand overlying limestone, sand and marine
shells. Elevations in the vicinity of the subject property range from sea level to 10 feet above
sea level (USGS 1994).
The subject property is located over a series of geological formations that include (from top to
bottom) the Pamlico Sand, Miami Oolite, Anastasia Formation, Tamiami Formation, and
Hawthorn Formation. The Miami Oolite is composed of oolitic limestone. The Anastasia
Formation is composed of solution/cavity-riddled, shelly or sandy limestone; calcareous
sandstone; quartz and carbonate very fine to medium sand with or without some clay, silt and
lime mud. The Tamiami Formation is composed of calcareous sandstone and limestone
interbedded with sand; sandy, shelly lime mud; and soft gray and green limestone. The
Hawthorn Formation that is composed of slightly clayey or sandy, gray limestone and light
green, foraminiferal limestone is the confining unit between the surficial freshwater Biscayne
Aquifer and the brackish Floridan Aquifer (Fish 1991).
Groundwater in Miami -Dade County is derived from the Biscayne Aquifer. Based on
groundwater contours as provided by the Water Resources Atlas of Florida (1998), the regional
groundwater flow direction is expected to be south-southeast. No specific groundwater flow
information is available for the subject property; however, will be determined at a later date.
The local hydraulic gradient -and flow direction at the subject property may be influenced
naturally by zones of higher or lower permeability or tidal effects and may deviate from the
regional trend.
4.0 HISTORICAL SITE ASSESSMENT ACTIVITIES
As described in Section 2.0, the subject property was utilized as an unlined public municipal
dump site from at least 1961 through May 29, 1978. Unpermitted dumping occurred through
1975, at which time the FDEP temporarily permitted the landfill. The refuse increased the
height of the landfill to approximately sixteen feet above sea level. It has been documented in a
memo dated June 3, 1977 From the Director of the Miami -Dade Water and Sewer Authority that
sludge from the waste water treatment plant, adjacent and north of the subject property, was
Submitted into the public `
record in connection with
item PZ -1 on 10-08-09
5 Priscilla A. Thompson
City Clerk
IEB
Summary of Limited CAPA Implementation Bureau Veritas Project Number 144456
Former Virqinia Kev Landfill July 2, 2009
utilized to fill a portion of Duck Lake, which was estimated to be approximately thirty feet deep.
Historic aerial photographs documenting the filling of the subject property were provided within
the CAPA dated February 18, 2009. According to information in regulatory files, the waste
stream for the landfill reportedly included construction and land clearing debris, yard trash, junk
cars and boats, household furniture, herbicides, biomedical wastes, street sweepings,
incinerator ash, and wastewater treatment sludge.
As part of the FDEP-approved Closure Plan as summarized in Consent Order #93, four
monitoring wells were installed on the property (north, south, east, and west). The monitoring
wells were sampled for select metals, bacteriological parameters, solids and nutrients as
approved by FDEP. The monitoring program began in 1978 and reportedly ended on April 5,
1988. Laboratory analytical data provided indicated that several metals were sporadically
detected above Miami -Dade County's groundwater CTLs. Ammonia and iron were periodically
reported above the applicable groundwater CTLs.
An FDEP inspection of the subject property on November 4, 1986 found that construction of a
potable drinking water pipeline was conducted on the northwest portion of the landfill (a
construction project for City of Miami Special Police Unit's Horse Stables (SPU)). A Phase I
Data Report for Methane Gas Assessment at the Virginia Key SPU Site dated February 23,
1987 was submitted to FDEP and DERM for review. On March 18, 1987, FDEP sent a revision
to Consent Order #93, which stated that "the construction of buildings, sewage, gas or water
supply mains, parking lots, paved areas or any other activities that could alter the final closing
design and cover of the site is prohibited unless specifically approved by the Department
(FDEP)." Since the City was considering building on the old landfill, FDEP required as part of
this amendment to Consent Order #93 a methane survey on the construction site pursuant to a
monitoring plan approved by FDEP. FDEP required a final methane report from the City in an
April 12, 1987 letter. The FDEP reviewed the methane assessment results (not the final report
as required) in May 1987, and based on the results, an amendment to Consent Order #93 was
executed. A methane gas assessment was performed on February 20, 1987 and the results
indicated that methane was a concern for development on the site. The City placed the SPU
project on hold until the methane issue could be resolved. Since the City of Miami decided not
to build the SPU on the landfill, the FDEP submitted a letter dated April 5, 1988 to the City
issuing a Notice of Completion and a termination of Consent Order 93. However, the Notice of
Submitted into the public
record in connection with
item PZ.1 on 10-08-09
6 Priscilla A. Thompson
City Clerk
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Summary of Limited CAPA Implementation 111- Bureau Veritas Project Number 144456
Former Virginia Key Landfill EZIMEEM July 2, 2009
Completion required that FDEP must be notified for prior approval if the subject property was to
be redeveloped at any time in the future. In order to complete the FDEP request for methane
gas assessment from the April 12, 1987 FDEP letter), a Phase II for methane gas assessment
was performed on January 18, 1989 and January 27, 1989 and the results were submitted for
review in a final report dated March 21, 1989. The reports detail the methane assessments that
were conducted by taking OVA readings approximately four feet below land surface in the
northern portion of the site. The results from the assessment indicated that methane levels
exceeded the 25% of the Lower Explosive Limit (%LEL), which is a concern for redevelopment.
This project was never completed.
A few years later (1993), another project at the site was proposed. The Miami -Dade County
Water and Sewer Authority (WASA) wanted to construct a force main on the west side of the
former landfill; however, they were required to perform a methane assessment prior to
construction. In 1993, the required methane assessment consisted of installing twenty-one
methane probes and sampling the gas for % LEL. The results showed methane levels above
25% LEL. The groundwater was sampled from one monitoring well near the proposed pipeline
and from the remaining monitoring wells that were installed as part of the Closure Plan. Results
of these monitoring events indicated that the groundwater samples exhibited elevated levels of
total dissolved solids, ammonia and phenols.
5.0 CURRENT SITE ASSESSMENT ACTIVITIES
5.1 SUMMARY OF GEOPHYSICAL INVESTIGATION
As proposed in the approved CAP, Bureau Veritas implemented the use of geophysical
methods at the subject property in April of 2008. The purpose of the geophysical survey was to
define the horizontal and vertical extent of buried waste at the former landfill to facilitate a
targeted assessment approach that would minimize invasive assessment methods, such as
soil/auger borings and test pits.
Preliminary geophysical data were collected at the Site from April 16 through April 24, 2008,
including a frequency domain electromagnetic (EM31) survey and a multi -channel analysis of
surface waves (MASW) survey. Review of the preliminary data indicated that geophysics would
Submitted into the public
record in connection with
item PZ.1 on 10-08-09
Priscilla A. Thompson
7 City Clerk
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Summary of Limited CAPA Implementation Bureau Veritas Project Number 144456
Former Virginia Key Landfill July 2, 2009
be useful in estimating the edges and depth of the former Duck Lake as well as provide useful
data on the remaining portions of the site. Bureau Veritas attempted to clear transects for
additional geophysical survey locations recommended by DERM in their letter dated June 18,
2008; however, due to the variations in topography and protected trees in the northeastern
portion of the site, slight modifications to the survey lines in that portion of the site were
necessary. The second stage of the MASW survey was completed on July, 7th, 8th and 9th,
2008.
The geophysical data collected at the site identified areas of high conductivity and buried metals
on the northern portion of the site that loosely correspond to the location of the former Duck
Lake. Areas of high conductivity appear to extend off-site to the north toward the Wastewater
Treatment Plant. In addition, buried metal targets were identified throughout the site. A copy of
the complete Geophysical Investigation Report, dated September 17, 2008 and supplemental
information dated December 12, 2008 have been provided to the DERM. '
5.2 MONITORING WELL INSTALLATION
Prior to the initiation of the subsurface activities, a utility clearance was performed in
accordance with Florida Statute 553.851 (Chapter 77-153), to determine the presence and
location of existing underground utilities in the proposed assessment area. The coordinates of
the monitoring well locations were recorded using a handheld Global Positioning System (GPS).
The DERM and the City were notified a minimum of three days prior to conducting any field
activities.
On May 18 through May 22, 2009, Bureau Veritas advanced a total of seventeen monitoring wells
on the perimeter of the site using a truck -mounted drill rig in the general locations of the perimeter
monitoring wells as approved by the DERM. The monitoring wells were installed in a cluster
configuration (6 total clusters) to provide groundwater quality data adjacent to the former landfill at
discrete depth intervals. The coordinates of the monitoring well locations were documented using a
handheld Global Positioning System (GPS).
The shallow monitoring wells were installed using the hollow stem auger method and were
constructed of two-inch diameter, Schedule 40, flush -jointed PVC pipe, with a ten foot screened
Submitted into the public \
record in connection with
item PZ.1 on 10-08-09
8 Priscilla A. Thompson
City Clerk
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Summary of Limited CAPA Implementation Bureau Veritas Project Number 144456
Former Virginia Key Landfill July 2, 2009
section 0.010 -inch slot followed by approximately five feet of solid PVC riser. The shallow
monitoring well screens were installed approximately two -feet above the water table. A 20/30 silica
sand filter pack was placed in the annular space of each borehole to approximately one -foot above
the top of the screen. An approximate one -foot thick fine sand seal was placed on top of the filter
pack and the remaining annular space was grouted to land surface.
The intermediate -depth and deep monitoring wells were installed via a combination of the hollow
stem auger method and cased mud rotary method and were constructed of two-inch diameter,
Schedule 40, flush -jointed PVC pipe, with a ten foot screened section 0.010 -inch slot followed by
an appropriate length of solid PVC riser. The screened intervals were installed approximately 25-35
feet NGVD and 55-65 feet NGVD for the intermediate and deep wells, respectively. A 20/30 silica
sand filter pack was placed in the annular space of each borehole to approximately one -foot above
the top of the screen. An approximate one -foot thick fine sand seal was placed on top of the filter
pack and the remaining annular space was grouted to land surface. A flush -mounted, eight inch
diameter, steel manhole was installed in concrete, with watertight, locking caps to complete the
well constructions. Waste materials encountered during this assessment were limited to land
clearing debris and traces of fabric, plastic, paper and metal detected during the installation of
monitoring wells at Cluster E and Cluster F locations. Auger cuttings generated from the
monitoring well installations were temporarily placed on and covered with visqueen on an interior
portion of the former landfill. The monitoring wells were developed using a centrifugal pump until
the water was clear and relatively free of sediment. Development water was placed in Florida
Department of Transportation (FDOT) approved drums and stored on-site, pending review of the
analytical results. Refer to the attached Figure 2, Appendix A for a site map depicting the location
of the well clusters. A Summary of Monitoring Well Construction Details is provided as Table 1,
Appendix B. Well Construction and Development Logs are included in Appendix C.
5.3 GROUNDWATER SAMPLE COLLECTION AND ANALYSIS
On June 1 through June 4, 2009, groundwater samples were collected from all of the monitoring
wells. The wells were purged with a peristaltic pump and disposable polyethylene tubing while the
parameters dissolved oxygen, turbidity, pH, temperature, and conductivity were monitored and
Submitted into the public
record in connection with
item PZ.1 on 10-08-09
9 Priscilla A. Thompson
City Clerk
4'pL VE9
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Summary of Limited CAPA Implementation Bureau Veritas Project Number 144456
Former Virginia Key Landfill July 2, 2009
recorded. Upon stabilization, groundwater samples were collected from the monitoring wells.
Groundwater samples were submitted to a State and National Environmental Laboratory
Accreditation Program (NELAP)-certified laboratory for analyses targeting those parameters listed
in the Code of Federal Regulations Title 40, Part 258, Appendix I, Appendix II and dioxins as
required by DERM.
Review of the laboratory analytical data of groundwater samples collected during this investigation
indicated concentrations either below the laboratory's detection limit and/or below the DERM CTLs
established in Chapter 24-44, the Code for analytes detected by EPA Methods 335.4 (cyanide),
353.2 (Nitrate/Nitrite and N), 1613B (Dioxins), 7470A (Mercury), 8011 (EDB, DBCP), 8141A
(Organophosphorous Pesticides), 8151A (Herbicides), and 8260B (Volatile Organics). The
laboratory analytical data did; however, indicate exceedances of the referenced DERM CTLs as
presented below.
Total Dissolved Solids (TDS) - the TDS concentrations detected in the shallow monitoring wells
ranged from 670 mg/L to 1,200 mg/L. TDS concentrations detected in the intermediate depth
monitoring wells ranged from 990 mg/L to 7,000 mg/L. TDS concentrations detected in the deep
monitoring wells ranged from 18,000 mg/L to 25,000 mg/L all of which exceeded the DERM CTL
of 500 mg/L.
Ammonia - ammonia concentrations detected in the shallow groundwater wells ranged from 1.6
mg/L to 82 mg/L. Ammonia concentrations detected in the intermediate depth groundwater wells
ranged from 32 mg/L to 160 mg/L. Ammonia in the groundwater samples collected from the deep
monitoring wells was generally detected at concentrations below the CTL of 2.8 mg/L with the
exception of monitoring well Cluster F_D which was reported at a concentration of 6 mg/L. The
ammonia concentrations appear to be most prevalent in the intermediate -depth monitoring wells
all of which exceeded the DERM CTL of 2.8 mg/L.
Sodium — sodium concentrations detected in the shallow groundwater wells ranged from 87,000
ug/L to 180,000 ug/L and were generally below the CTL of 160,000 ug/L with the exception of
groundwater samples collected from monitoring well Cluster B_S. Sodium concentrations
detected in the intermediate depth monitoring wells ranged from 900,000 ug/L to 2,500,000 ug/L.
Sodium in the groundwater samples collected from the deep monitoring wells ranged from
9,100,000 ug/L to 12,000,000 ug/L.
Chloride - chloride concentrations detected in the shallow groundwater wells ranged from 70
mg/L to 150 mg/L and were below the CTL of 250 mg/L. Chloride concentrations detected in the
intermediate depth monitoring wells ranged from 110 mg/L to 3,300 mg/L. Chloride
concentrations in the groundwater samples collected from the deep monitoring wells ranged from
17,000 mg/L to 19,000 mg/L. Chloride is the dominant anion is sea water which averages a
chloride concentration of 19,350 mg/L.
Submitted into the public
record in connection with
item PZA on 10-08-09
10 Priscilla A. Thompson
City Clerk
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Summary of Limited CAPA Implementation vf5 Bureau Veritas Project Number 144456
Former Virqinia Key Landfill r0im.110K. July 2, 2009
Iron - The iron concentrations detected in all of the monitoring wells ranged from 71 ug/L to
14,000 ug/L. Review of the spatial distribution of iron concentrations exceeding the CTL of 300
ug/L appeared to be more a function of location rather than depth as the highest concentrations
were detected on the northeast and west perimeter of the landfill at monitoring well Cluster A,
Cluster E and Cluster F at all depth intervals. It is suspected that iron is a naturally occurring
metal in this area, associated with naturally occurring particulates in soil. This conclusion is
supported by the Florida Geological Survey Special Publication No. 34, Florida's Ground Water
Quality Monitoring Program, Background Hydrogeochemistry, dated 1992.
Additionally, chemicals of concern were sporadically detected in groundwater samples collected
from monitoring wells and included arsenic (Cluster B_S), aldrin (Clusters E_I and F—S), dieldrin
(Clusters A_S and E—S), phenol (Cluster F_S) and vanadium (Cluster D_I) which were detected
at concentrations exceeding their respective CTI -s. Bis(2-ethylhexyl) phthalate was detected
above it's CTL of 6 ug/L in groundwater samples collected from Cluster A_I and Cluster B_I and
was also detected in the equipment blank. This compound is commonly used as a plasticizer in
manufacturing of PVC and other plastics to make them flexible. The monitoring wells installed at
the site are constructed of PVC. Refer to Figure 2, Appendix A for a Monitoring Well Location
Map. Groundwater quality is summarized in Table 2, Appendix B. Groundwater Sampling Logs
are provided in Appendix C. A copy of the Laboratory Analytical Reports and Chain of Custody
forms are provided in Appendix D.
6.0 QUALITY ASSURANCE/QUALITY CONTROL
Data quality reported herein was maintained by performing all field sampling in accordance with
the Standard Operating Procedures provided in Chapter 62-160, Florida Administrative Code
(FAC). The laboratory (Test America, Inc. in Tallahassee, Florida) that analyzed the samples
obtained during this assessment performed the analyses pursuant to NELAP certification
requirements. The data quality objectives for this project were initiated to provide data of the
caliber- necessary to provide a preliminary site screening evaluation. Data quality indicators were
reviewed by both the laboratory and Bureau Veritas Project Managers and QAlQC Managers.
Bureau Veritas coordinated with the laboratory prior to sample collection to evaluate the
laboratory reporting limits for the contaminants of concern with respect to the cleanup target levels
(CTLs). Laboratory quality control data, comments and qualifications are summarized within the
laboratory analytical reports provided in Appendix D.
Submitted into the public
record in connection with
item PZ.1 on 10-08-09
Priscilla A. Thompson
11 City Clerk
�Pii �.F9
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Summary of Limited CAPA Implementation Bureau Veritas Project Number 144456
Former Virginia Key Landfill July 2, 2009
7.0 CONCLUSIONS AND RECOMMENDATIONS
7.1 CONCLUSIONS
Bureau Veritas has recently completed a limited implementation of the approved CAP with
modifications as approved by the DERM on February 2, 2009. The objective of this assessment
was to evaluate the current groundwater quality at select depth intervals at the perimeter of the
site. Based on the results of the assessment, Bureau Veritas concludes the following.-
Laboratory
ollowing:
Laboratory analytical data of groundwater samples collected during this investigation
indicated concentrations either below the laboratory's detection limit and/or below the
DERM's groundwater CTLs for analytes detected by EPA Methods 335.4 (cyanide), 353.2
(Nitrate/Nitrite and N), 1613B (Dioxins), 7470A (Mercury), 8011 (EDB, DBCP), 8141A
(Organophosphorous Pesticides), 8151A (Herbicides) and 8260B (Volatile Organics).
• Total dissolved solid (TDS), sodium, chloride and iron concentrations were detected in
the groundwater samples above the referenced CTLs; however, appear to be
attributable to the location of the site with respect to the Atlantic Ocean, rather than an
adverse environmental impact as a result of former land filling activities.
• Laboratory analytical data did; however, indicate the detection of ammonia at
concentrations above the referenced CTLs, the highest concentrations of which were
detected in the groundwater samples collected from the intermediate -depth monitoring
wells with values ranging from 32 mg/L to 160 mg/L. Additionally, aldrin, arsenic, dieldrin
phenol and vanadium were detected at concentrations exceeding their respective CTLs.
7.2 RECOMMENDA-TIONS
Based on the groundwater quality data collected from the locations provided and approved by the
DERM, further assessment as provided in the CAP with modifications appears warranted.
Submitted into the public
record in connection with
12 item PZA on 10-08-09
Priscilla A. Thompson
City Clerk
1
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Submitted into the public
record in connection with
item PZ.1 on 10-08-09
Priscilla A. Thompson
City Clerk
<<� USGS Site Location Map
Former Virginia Key Landfill SCALE
Miami, Miami -Dade County, Florida
As Shown
BV Project * 144456 Julv 2009
Figure
1