Lemon Lane Final Report
June, 2001
1.0 Introduction | 2.0 Site Description and History | 3.0 Remediation Planning | 4.0 Changes to Original Work Plan | 5.0 Sampling Activities | 6.0 Preparation of Iterim Cap Surface | 7.0 Intallation of the Geosynthetic Clay Barrier | 8.0 Placement of Geomembrane and Geonet | 9.0 Placement of Vegetative Support Zone | 10.0 Site Surface Water Controls | 11.0 Site Restoration | 12.0 Data Validation | Photos
3.0 REMEDIATION PLANNING
3.1 Work Plans
A Statement of Work (SOW) that was agreed to by all the Consent Decree parties
on May 15, 2000 set forth the requirements for implementation of the remedial
action. The SOW required the removal of specific "hot spot" volume containing PCB
contamination and the subsequent sampling of the remaining surfaces to insure the
clean up criteria was met. The hot spot volume contained within these contours was
based on the 1996 borings described in Section 2.4.1.3.
Viacom prepared a Remedial Design / Remedial Action Work Plan (WP) for the LL
Landfill to meet the requirements of the SOW. The WP, approved by the
government parties, was issued on May 17, 2000.
The SOW requires that a RCRA Subtitle C cap be constructed over the waste
material that remains on site. The cap was described generally in the May 17 WP
(30% design) as required by the SOW. A Final Cap Design Report was prepared
and issued by Viacom on October 18, 2000, which described the details of the cap
installation. That document included drawings and detailed specifications for the
final RCRA Subtitle C cap.
3.2 Extent of Waste Borings
In 1999 and 2000, 44 supplemental geoprobe borings were completed in two phases
at selected locations over the landfill cap and on Viacom property immediately west
of the landfill. The objectives of the supplemental geoprobe work were to: 1 ) further
characterize the thickness of waste and the top of bedrock over the landfill, and 2) to
evaluate existing soils west of the landfill for possible use as borrow soil during
remediation and construction of the RCRA Subtitle C cap. No analytical testing was
performed as part of this investigation. Figure 3 of the WP, the Thickness of Waste
Map, shows the results of this investigation.
3.3 Pre-Construction Delineation Sampling of Perimeter Locations
Delineation sampling around the outside perimeter of the LL site fence line was
performed in accordance with the March 2000 "Soil Delineation Sampling & Analysis
Plan". The sampling and analysis performed as part of this plan defined areas at the
perimeter that required excavation to meet the clean criteria as defined by the SOW.
A final report of the results is included in the LL WP as Appendix A.
Areas outside the existing fence on the north, east and west were delineated to meet
a criteria of 2 ppm PCB average with no individual grid equal to or exceeding 5 ppm.
Grids along the south of the site between the fence and the railroad tracks were
delineated to meet a clean criterion of less than 35 ppm for any individual grid and
an average of less than 20 ppm over the entire area. Grid sampling continued
outward until a clean perimeter was determined.
The results of the delineation sampling are presented in Appendix A, Figure 3 and
Table 1 of the WP. Sixteen perimeter areas were sampled and only grids in Areas
5, 6, 8, 9, 13, 14 and 15 required excavation. Excavation of the perimeter grids was
conducted as part of the overall site remediation. Grids that met the clean criteria
during this pre-excavation delineation were not subject to post excavation sampling,
but were included in the computation of area averages for meeting the cleanup
cuter~on.
The Griffin property and the area around MOO-7 were not sampled as part of this
delineation effort. Previous sampling and analysis of these areas had already
identified locations that required excavation.
3.4 Southeast Investigation
Beginning the year 2000, Viacom performed exploratory work in the southeast
corner of the landfill. Six wells were installed within the upper bedrock zones
(epikarst) for the purpose of identifying subsurface Groundwater transport structures.
One of the wells, LF6, encountered free product PCB oil, which was ultimately
recovered by bailing.
This investigation also included soil boring sampling and analysis of overburden
soils and the determination of the depth of bedrock. Analytical results obtained
showed that the SOW hot spot excavation contours in this area, based on the 1996
borings, were not representative of the actual PCB contamination at depth.
Appendix A discusses the results of this investigation in more detail. Excavation
plans were modified from the SOW hot spot contours to account for the PCB
contamination delineated during this investigation. Approval from the government
parties was received for these modifications.
3.5 Baseline Surveying
All surface elevations shown on drawings prior to the work plan preparation were
based on interpretations of aerial photos. To more accurately define the site surface
features for construction and excavation purposes, Smith Nuebecker and Associates
(SNA) conducted a detailed pre-construction survey of the landfill surface and areas
immediately adjoining the landfill. Points were surveyed 50 to 100 feet apart and at
any major break points in slope. Figure 1 of the WP from SNA shows these
contours in the background. The survey data generated by SNA was used as the
basis for all design, excavation and construction activities.
3.6 Monitoring Well Abandonment
Specific Groundwater monitoring wells and piezometers in the waste and staging
areas were abandoned and removed to allow the required excavation to proceed. A
total of five Groundwater monitoring wells and eleven piezometers were abandoned
or otherwise removed in 2000. The final determination of which monitoring wells to
remove was made by agreement between Viacom and the government parties.
Installation of replacement or additional piezometers is discussed in Section 6.4 of
this Report.
The five monitoring wells that were abandoned included MOO-7 and MOO-9 outside the
known limits of waste on the west side of the site, along with landfill (LF) wells LF-2,
LF4 and LF-5 that were installed through the old Hypalon liner in the southeast corner
of the interim cap. The eleven piezometers that were abandoned comprised shallow
piezometers PZ-1 through PZ-9, which were clustered together in the northeast corner
of the interim cap, and deeper piezometers PZ-1A and PZ-2A in the area of suspected
sinkholes underlying the waste and interim cap. The locations of these monitor wells
and piezometers are shown on Figure 2 of the May 17, 2000 RD/RA Work Plan, in a
drawing titled Site Map With Survey Control Points.
The five monitoring wells and the two deep piezometers were abandoned between
May 11, 2000 and June 8,2000 by Midwest Environmental Drilling (MED) of
Cincinnati, Ohio. MED followed Indiana State procedures specified in 310 IAC16-10-2
to abandon these monitoring locations and submitted Record of Water Well
(abandonment) logs to the Indiana Department of Natural Resources (IDNR), Division
of Water, 402 W. Washington Street, Room W264, Indianapolis, Indiana, 46204.
Copies of the abandonment logs for these monitoring wells and piezometers are
presented in Appendix B. along with a copy of the cited regulation.
The remaining nine piezometers (PZ-1 through PZ-9) were relatively shallow into the
waste and not abandoned under IDNR guidelines,. These piezometers in the
northeast part of the site were removed in their entirety during the excavation of
landfill waste. No IDNR abandonment forms were prepared or submitted for these
shallow piezometers. A description of well abandonment work is presented in
Appendix B along with a copy of the cited regulation and copies of the well
abandonment logs.
Three additional monitoring locations, LF1, LF6 and LF7, were retained as the
excavation proceeded because of continued interest. However, during the deep
bedrock excavation in the southeast, the excavation proceeded to the bottom of
these wells. As a result, the locations were temporarily abandoned as monitoring
points The locations were surveyed prior to removal to allow each to be relocated
later as required. (NOTE: LF-6 was eventually re-installed and is located as shown
in Figure 8.)
3.7 Interim Groundwater and Surface Water Monitoring Program
An interim monitoring program for Groundwater and surface water was implemented
as part of the LL Landfill remediation as indicated in the LL SOW. The purpose of
the monitoring program was to detect any increasing trends of PCB in the water near
the site during implementation of the work plan activities. Per the SOW, Illinois
Central (ICS), Quarry (ICQ) and Slaughterhouse (SL) springs and Sargent's Pond
were to be monitored. The Quarry Spring samples represent the combined flow of
Quarry A, B and C. The Quarry samples were take 10 ft. upstream of the entrance
of the culvert that is located under Adams Street. Water from all the spring locations
was sampled and analyzed for PCBs prior to the start of excavation activities and
every 30 days during excavation. The SOW also required that two residential wells
located at 2320 West Beaumont Lane and 111 North Kimble be sampled after
excavation began.
In the LLWP the interim monitoring plan required Viacom to sample the following
locations:
- Illinois Central, Quarry and Slaughterhouse Springs monthly for PCBs and total
suspended solids (TSS).
- Residential wells at 2320 West Beaumont Lane and 111 N. Kimble. Samples
taken at the conclusion of the source control remedial action assuming access to
the properties was permitted.
- Water in Sargent's Pond. Samples~were taken prior to excavation, monthly
during excavation and after the completion of the RCRA cap.
- Sampling of the springs and the pond to continue monthly until replaced by the
long-term Groundwater monitoring program.
Removal of the Hypalon liner interim cap began on May 17, 2000. The three
springs, ICS, ICQ and SL, were sampled on April 22, 2000 and monthly thereafter.
Initial sample results in April showed that ICS was 6.9 ppb, ICQ was 2.5 ppb and SL
was 0.11 ppb. As of February the result for ICS was 2.9 ppb (4.3 ppb duplicate),
ICQ was 0.37 ppb and SL was BDL (below detection limit).
The residential well at 111 North Kimble, belonging to the Bennetts, was sampled on
August 28, 2000. The result of the sample analysis was BDL. The well at 2320
West Beaumont Lane is no longer in service and therefore was not sampled. With
the agreement of Dennis Williamson of the Monroe County Health Department, a
residential well that is still in service belonging to the Isons at 220 North Kimble, was
sampled instead. On August 28, 2000 a sample was collected from the well at 220
North Kimble and found to be BDL. As required these wells were sampled after the
RCRA cap was completed. Analysis of the March 14, 2001 samples taken from
these wells showed both wells were BDL for PCB.
Two water samples were collected from Sargent's Pond on February 23, 2000 and
both were found to be BDL. From June on past he completion of the remediation
and cap water samples were collected monthly from Sargent's Pond. The sample
result from June 27, 2000 was 0.95 ppb. On October 19, 2000 the Sargent's Pond
water sample PCB content was 2.9 ppb and on February 27, 2001 the PCB level
was 0.76 ppb. See Table 9 for all the results of the interim Groundwater monitoring
sample analyses. Sampling of the springs and Sargent's Pond will continue until the
long term Groundwater monitoring program is implemented and be reported
independent from this final report.
3.8 Natural Gas Line Abandonment
The gas line that runs along the south and southeast perimeter of the site, as shown
in Figure 2, was isolated at the west and east sides of the site and then purged. The
purged gas line was ultimately removed during excavation of the south perimeter.
The gas company installed a new line after the area was excavated, sampled and
backfilled to grade.
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