Alternatives for Managing the Nation's Complex Contaminated Groundwater Sites (2013) / Chapter Skim
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Appendix C: Analysis of 80 Facilities with Contaminated Groundwater Deleted from the National Priorities List
Appendix C: Analysis of 80 Facilities with Contaminated Groundwater Deleted from the National Priorities List
Pages 301-408
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From page 301... ...
, and the extent to which contaminant concentrations in groundwater met maximum contaminant levels (MCLs) prior to facility delisting, respectively.
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From page 302... ...
Upper Deerfield Township Sanitary Landfill 18. V&M/Albaladejo 19.
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Dakhue Sanitary Landfill 47. Fadrowski Drum Disposal 48.
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From page 304... ...
Waverly Ground Water Contamination 70. White Farm Equipment Co.
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Pfohl Brothers Landfill 3. SACO Tannery Waste Pits 13.
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From page 306... ...
Gold Coast Oil Corp.
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Waverly Ground Water Contamination 70. White Farm Equipment Co.
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Upper Deerfield 59. Fourth Street 22.
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From page 309... ...
Dakhue Sanitary 79. Northwest Maryland Wood Disposal Landfill Transformer Treating 27.
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From page 310... ...
Waverly Ground Water Contamination 73. Del Norte Pesticide Storage 74.
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Vestal Water Supply Well 71. Rose Park Sludge 14.
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Mallard Bay Landing Bulk Plant 63. Odessa Chromium #2 (Andrews Highway)
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80. Union Pacific Railroad Company
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SACO Tannery Waste Pits Supply Well 4-2 Avenue Dump 33. Gold Coast Oil 39.
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Krysowaty 18. V&M/ Chemicals Deerfield Electronics, Farm Albaladejo Township Inc.a Sanitary Landfill 41.
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From page 316... ...
Southside Railroad Sanitary Company Landfill 62. Mallard Bay Landing Bulk Plant 65.
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From page 317... ...
APPENDIX C 317 Other RAO Didn't No Risk Risk Include MCL Apparent Assessment/ Assessment/ Achievement Achievement GW No LTM LTM of MCLs Unknown Contamination 73. Del Norte Pesticide Storagea 75.
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From page 318... ...
318 APPENDIX C Potable Well Fields Military 4% Bases 3% Other 10% Industrial Facilities 61% Landfills 22% FIGURE C-1 80 Delisted NPL facilities by "site type." Figure Appendix B-1.eps Other 13% Metals, VOCs VOCs, Only and SVOCs 32% 9% Metals and VOCs VOCs 21% and SVOCs 5% Metals Only 20% FIGURE C-2 Contaminant groups found at the 80 delisted NPL facilities. Figure Appendix B-2.eps
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From page 319... ...
APPENDIX C 319 No Explicit Goal 34% MCLs or Another Cleanup Level 59% Not Clear But Reduced Risk 7% FIGURE C-3 Types of remedial action objectives for the 80 delisted NPL facilities. Figure Appendix B-3.eps
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From page 320... ...
320 MCL CharacterizaƟon Not a Groundwater Site 5 MCLs Achieved: AcƟve Remedy: No LTM MCL Achievement Unknown 14 6 Remedial ObjecƟve other than MCLs Achieved: AcƟve Remedy: LTM 4 MeeƟng MCLs (such as TI zone, 12 pathway interrupƟon like containment or provision of alternaƟve drinking water supply, prevent migraƟon of contaminaƟon offsite or to another aquifer, etc.) MCLs Not Achieved: Deleted 4 MCLs Achieved: No AcƟve Remedy: No LTM Based on Risk Assessment: LTM 19 2 MCLs Not Achieved: Deleted Based on Risk Assessment: No LTM 14 MCLs Not Achieved: LTM FIGURE C-4 Extent of achievement of MCLs for the 80 delisted NPL facilities.
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Yes ICs in Place? None listed Vapor Intrusion: Unclear.
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From page 322... ...
Yes, they are restricting site and aquifer use through a restrictive covenant. Vapor Intrusion: Not a concern because: "(1)
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From page 323... ...
Technologies Applied: GW monitoring, source control, excavation Reported Results: Arsenic concentrations continue to exceed the ACL of 123 µg/L in one of four locations (MW-103) and the 2001 MCL in four of the other five wells in the long-term monitoring program.
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From page 324... ...
324 APPENDIX C Vapor Intrusion: Not a concern because the COCs are primarily metals and monochlorobenzene is essentially limited to one area of the site, and institutional controls that prevent development are in place. Long-Term Monitoring?
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waiver was granted for a 10-acre area where MCLs do not have to be met. Technologies Applied: Groundwater monitoring and monitored natural attenuation Reported Results: Groundwater monitoring within the TI Zone has shown gradual reductions in concentrations of contaminants.
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No contaminants were detected above drinking water maximum contaminant levels (MCLs)
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From page 327... ...
Offsite: ensure no site-related contaminants are impacting local drinking water sources. Technologies Applied: Excavation/capping, groundwater monitoring, and MNA Reported Results: Onsite: 2006 – benzene 2.8 µg/L (RAO 0.7)
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From page 328... ...
ICs in Place? Yes, there are deed restrictions and/or well permitting restrictions to prevent human contact with contaminated groundwater at the site.
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From page 329... ...
along with NYC programs protecting its reservoirs and water supplies are sufficient. Vapor Intrusion: 2006 GW monitoring showed likelihood of vapor intrusion to be low.
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Vapor Intrusion: Not mentioned Long-Term Monitoring?
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From page 331... ...
Vapor Intrusion: Based on the distance to the nearest residences, further evaluation of vapor intrusion is not deemed necessary. Also, indoor air sampling was performed as part of the 1988 Love Canal EDA Habitability Study which did not find any indoor air issues within the homes in the emergency declaration area.
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From page 332... ...
. Technologies Applied: Pump and treat Reported Results: Monitoring has indicated that the goal of restoring the groundwater aquifer to meet all appropriate drinking water standards specified in the ROD has been achieved.
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From page 333... ...
No, SVOC concentrations are still above water quality standards ICs in Place? Yes, in the form of declarations of covenants and restrictions on access Vapor Intrusion: VOCs in the groundwater are located within the containment system and are at a great distance from the residences, so the potential for soil vapor intrusion issues related to this site is low.
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From page 334... ...
of waste material and contaminated soil were excavated and disposed of offsite. The results of groundwater monitoring conducted over a five-year period indicate that the groundwater is clean.
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From page 335... ...
Occurrences of contamination at MW-5, the site upgradient well, and MW-8, which was located in an area thought to be uncontaminated, were not anticipated and appear to be the results of high background levels. According to the Federal Register notice, "The groundwater monitoring conducted annually from 1989 through 1994 did not detect Site-related contaminants above criteria established for the protection of groundwater.
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None listed Vapor Intrusion: Not mentioned Long-Term Monitoring? None after 1994
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None listed Vapor Intrusion: Not mentioned Long-Term Monitoring?
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From page 338... ...
None listed Vapor Intrusion: Not mentioned Long-Term Monitoring?
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From page 339... ...
None listed Vapor Intrusion: The remote subsurface location of the contaminants precludes fugitive particulate or vapor emissions from the Site. Low levels of VOCs in the subsurface soil samples also indicate that the volatilization to ambient air will be negligible.
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From page 340... ...
Baseline risk assessment found that under current and likely future land use scenarios, total carcinogenic risks are within EPA's acceptable risk range for the site. Technologies Applied: Groundwater monitoring Reported Results: 2009 well sampling results (contaminants above MCL highlighted in italics)
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From page 341... ...
ICs in Place? Yes, an alternate water supply was provided.
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Not applicable because no groundwater contamination ever found ICs in Place? None listed Vapor Intrusion: Not mentioned Long-Term Monitoring?
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From page 343... ...
to Well 4-2 have declined to levels which are below drinking water standards. MCLs Achieved?
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From page 344... ...
A risk assessment performed during the RI/FS concluded that groundwater contamination posed no threat to human health or the environment. Technologies Applied: Groundwater monitoring to watch for migration of contamination into drinking water aquifers Reported Results: The maximum monitoring-well concentrations for chromium appear to be holding steady through successive sampling events at around 40 ppm total chromium (MCL 0.1 ppm)
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From page 345... ...
Yes, there is a prohibition of consumption of onsite groundwater Vapor Intrusion: Not considered a pathway of concern Long-Term Monitoring?
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From page 346... ...
Yes, institutional controls restrict the use of groundwater at the Site and prohibit excavation unless prior written approval is provided by EPA, PADEP, and the property owner. Vapor Intrusion: Vapor intrusion would be a potential concern to be quantitatively evaluated if a building were constructed on-site.
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From page 347... ...
Yes, alternate drinking water supply was provided (community water supply line was extended to a new water line)
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From page 348... ...
State: MD Site Lead: EPA Date Deleted from NPL: July 18, 2000 Date of Last Five-Year Review: September 26, 2008 COCs: Chromium RAOs: Reduce chromium concentrations to below the MCL of 100 µg/L Technologies Applied: Groundwater monitoring, natural attenuation Reported Results: The groundwater monitoring program demonstrated to EPA's and MDE's satisfaction that groundwater met water quality standards, and the program was discontinued prior to the Site's deletion from the NPL in 2000. MCLs Achieved?
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From page 349... ...
EPA developed a health-based drinking water cleanup level of 4.4 mg/L for Tris. Technologies Applied: Groundwater monitoring and natural attenuation Reported Results: The fact sheet says that Tris, a flame retardant, was detected in soils near the drum storage area and in shallow groundwater beneath the site.
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From page 350... ...
perylene, pentachlorophenol RAOs: Protect groundwater as a current or potential future drinking water supply by containing or treating subsurface soil that contains in excess of 1.0 ppm B(a) P equivalence Technologies Applied: Sheet pile wall, excavation, pump and treat Reported Results: No results reported MCLs Achieved?
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From page 351... ...
5 State: DE Site Lead: EPA Date Deleted from NPL: September 28, 2001 Date of Last Five-Year Review: February 11, 2005 COCs: Benzene, vinyl chloride, 1,2-dichloropropane, 1,4-dichlorobenzene, tricholorethene RAOs: As per the most recent five-year review, the goal was to reduce contaminants to the following MCLs: benzene 5 µg/L, vinyl chloride 2 µg/L, 1,2-dichloropropane 5 µg/L, 1,4-dichlorobenzene 75 µg/L, and tricholorethene 5 µg/L. MCLs were not included in the original RAO.
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From page 352... ...
. Technologies Applied: Groundwater monitoring, natural attenuation and soil excavation.
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From page 353... ...
, and beryllium 4 µg/L Technologies Applied: Excavation/GW monitoring Reported Results: With the exception of an apparently spurious result in February 2005, cadmium concentrations in the collected samples have not exceeded the MCL of 5.0 μg/L since the first quarter of 1998. In addition, the results of the groundwater monitoring program have verified that the treatment of soils has not released significant concentrations of the other COCs (lead, antimony, arsenic, and beryllium)
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From page 354... ...
. Technologies Applied: Groundwater monitoring and natural attenuation Reported Results: July 2006 results show all concentrations below the MCLs except chromium (MCL 100 µg/L)
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From page 355... ...
Yes, provision of an alternate water supply (residents were connected to the public water line) Vapor Intrusion: Not mentioned Long-Term Monitoring?
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From page 356... ...
State: FL Site Lead: EPA Date Deleted from NPL: August 4, 2004 Date of Last Five-Year Review: September 25, 2008 COCs: VOCs RAOs: Reduce COC concentrations below the following MCLs: benzene 1 µg/L, 1,1-dichloroethene 7 µg/L, pentachlorophenol 30 µg/L, PAHs 10 µg/L, trichloroethene 2 µg/L, and xylenes 50 µg/L. Technologies Applied: Excavation and bioremediation of soils; draining and backfilling of on-site ponds; removal of on-site structures; site grading and revegetation; installation of surface water runoff controls; and groundwater monitoring.
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From page 357... ...
State: FL Site Lead: EPA Date Deleted from NPL: October 9, 1996 Date of Last Five-Year Review: September 20, 2001 COCs: VOCs RAOs: Reduce COC concentrations below the following MCLs: 1,1dichloroethane 50 µg/L, t-1,2-dichloroethane 700 µg/L, methylene chloride 50 µg/L, tetrachloroethene 7 µg/L, toluene 3400 µg/L, and tricholorethene 30 µg/L. Technologies Applied: Excavation and a groundwater recovery, treatment, and disposal system Reported Results: October 1996 sampling showed all COCs below MCLs MCLs Achieved?
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From page 358... ...
Technologies Applied: Excavation and groundwater monitoring Reported Results: "Chromium, cyanide, and zinc have been detected in groundwater at the Independent Nail Company Site at maximum concentrations of 0.058 mg/L, 0.110 mg/L and 0.098 mg/L, respectively. A comparison of these contaminant concentrations with drinking water MCLs, SMCLs, and health advisories indicates that total chromium is the only groundwater contaminant at the Independent Nail Company Site which exceeds any of these standards or criteria." (http://www.epa.gov/superfund/ sites/rods/fulltext/r0488040.pdf)
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From page 359... ...
ICs in Place? Yes, an alternate water supply was provided, and there is access control via fencing and gating.
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From page 360... ...
phthalate 6 µg/L Technologies Applied: Groundwater monitoring Reported Results: No organic compounds were detected during Nov. 2005 sampling.
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From page 361... ...
State: SC Site Lead: EPA Date Deleted from NPL: October 13, 2000 Date of Last Five-Year Review: June 7, 2004 COCs: Lead RAOs: Reduce lead concentrations to below the MCL of 15 µg/L Technologies Applied: Groundwater monitoring/excavation of soils Reported Results: 2004 groundwater monitoring indicates that the groundwater concentrations for lead are below 15 µg/L. MCLs Achieved?
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From page 362... ...
According to the most recent five-year review, EPA and the South Carolina Department of Health and Environmental Control are currently reviewing the most recent groundwater monitoring report in order to determine the appropriate response with regard to future system operations and groundwater monitoring.
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From page 363... ...
Yes. The site is within a Florida Ground Water Delineation Area so there is a restriction on new drinking water wells.
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From page 364... ...
Technologies Applied: Groundwater monitoring and natural attenuation Reported Results: The latest groundwater monitoring data show that nickel, chromium, and thallium were not detected in any of the three groundwater wells above the MCL. Groundwater monitoring ended in 2001 in accordance with the ROD.
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From page 365... ...
Exposure and toxicity assessment showed no unacceptable risk. Technologies Applied: Soil excavation and groundwater monitoring Reported Results: None listed.
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From page 366... ...
Technologies Applied: Groundwater monitoring and natural attenuation Reported Results: In October of 1996, analytical results showed that only two wells had detectable concentrations of PCE. The concentration at OW6 was 6 µg/L, which is below the Health Risk Limit (HRL)
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From page 367... ...
. Technologies Applied: Groundwater monitoring Reported Results: None listed MCLs Achieved?
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From page 368... ...
Operate the system until contaminant levels are at or below 5 µg/L for six consecutive months. Technologies Applied: Pump and treat, groundwater monitoring Reported Results: "All groundwater contaminants have reached the cleanup standards specified in the 1987 agreement between the Coast Guard and MDNR." (http://www.epa.gov/superfund/sites/fiveyear/f05-05024.pdf)
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From page 369... ...
Some of these values are the federal MCLs and some are lower. Technologies Applied: Pump and treat, soil excavation, and groundwater monitoring Reported Results: As documented by the June 27, 1996, Remedial Action Report and the September 18, 1996, Superfund Site Close Out Report, confirmatory sampling verified that all soil, sediment, and groundwater cleanup standards were met at the Site and that all cleanup actions specified in the amended ROD have been implemented.
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From page 370... ...
RAOs: Reduce contaminants to the following MCLs: chloroform 70 µg/L (MCLG) , cadmium 5 µg/L, and lead 15 µg/L Technologies Applied: Groundwater monitoring, source control on the landfill OU Reported Results: No results listed for COCs MCLs Achieved?
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From page 371... ...
Technologies Applied: Groundwater monitoring, source control, and natural attenuation Reported Results: As of 2008 many monitored compounds had declined in concentration via the process of natural attenuation such that they met the cleanup criteria (1988 Chapter NR 140 PALs, ESs or established ACLs)
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From page 372... ...
State: OH Site Lead: EPA Date Deleted from NPL: September 5, 2000 Date of Last Five-Year Review: May 15, 2009 COCs: PCBs, PAHs, SVOCs, VOCs, and metals RAOs: Protection of human health and the environment Technologies Applied: Excavation, groundwater diversion trenches, and monitoring Reported Results: "A diversion trench was constructed up-gradient of the capped area, in order to intercept all groundwater flow in the shallow aquifer moving northward toward the Site, and a drain in the trench conducts the intercepted flow directly to Cemetery Creek. Treatment of the diverted water was not required because upgradient groundwater is not contaminated.
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From page 373... ...
APPENDIX C 373 Vapor Intrusion: Not mentioned Long-Term Monitoring?
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From page 374... ...
State: WI Site Lead: EPA Date Deleted from NPL: October 1997 Date of Last Five-Year Review: April 6, 2010 COCs: Copper, fluoride, nickel, zinc, 1,1- dichloroethylene, tricholorethene, and vinyl chloride RAOs: Reduce contaminants below the following ACLs: fluoride 4,800 µg/L, copper 1,000 µg/L, nickel 644 µg/L, zinc 5,000 µg/L, tricholorethene 40 µg/L, vinyl chloride 10 µg/L, and 1, 1-dichloroethylene 10 µg/L. These numbers are much higher than MCLs.
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From page 375... ...
, the IN Department of Environmental Management will develop and submit an IC Plan that will include a schedule for implementing an easement/restrictive covenant, as well as an evaluation of the need for any additional institutional controls. Vapor Intrusion: Not applicable Long-Term Monitoring?
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From page 376... ...
Technologies Applied: Pump and treat, and groundwater monitoring Reported Results: Groundwater remediation goals were met in 1995 MCLs Achieved? Yes ICs in Place?
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From page 377... ...
OU1 State: MN Site Lead: State Date Deleted from NPL: February 6, 2001 Date of Last Five-Year Review: June 15, 2007 COCs: Chloroform and TCE RAOs: Reduce chloroform contamination below 60 µg/L (the MCLG is 70 µg/L) and TCE below 5 µg/L Technologies Applied: Pump and treat Reported Results: Groundwater samples from all five monitoring wells showed concentrations of chloroform ranging from 2.3 to 23 µg/L, which was below than the MDH drinking water criteria of 60 µg/L.
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From page 378... ...
Yes, deed restrictions Vapor Intrusion: Not mentioned Long-Term Monitoring?
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From page 379... ...
Technologies Applied: Pump and treat, groundwater monitoring Reported Results: Response actions have successfully reduced contaminant concentrations below action levels. MCLs Achieved?
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From page 380... ...
The most recent review states: "The original ROD for the Site did not contain a ground water remedy, as the RI concluded that the Site had no impact on drinking water, and ‘in the unlikely event that site constituents were to migrate via a ground water pathway, it would take more than 800 years for them to reach potable ground water.
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From page 381... ...
Technologies Applied: Soil excavation in the original ROD. Because EPA anticipated that associated groundwater contamination would naturally attenuate once the source was removed, the 1993 ROD did not include a groundwater remedy.
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From page 382... ...
The plan for the site seems to indicate that no one will ever drink the groundwater, precluding the need to meet MCLs. Technologies Applied: Groundwater monitoring and natural attenuation Reported Results: COC concentrations tend to be decreasing, except for chlorinated solvents in a few wells.
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From page 383... ...
, and lead RAOs: Prevent contamination of underlying 150-foot-deep drinking water aquifer and restore contaminated shallow groundwater, based on its classification, for future use. Technologies Applied: Groundwater monitoring and natural attenuation Reported Results: Deep Water Zone: According to the first five-year review report (EPA 2002a)
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From page 384... ...
Vapor Intrusion: The risk assessment did not consider vapor intrusion to indoor air. Although there are residences located within 100 feet of the site boundary (i.e., to the east)
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From page 385... ...
, arsenic, and antimony RAOs: Protection of human health and the environment Technologies Applied: Groundwater monitoring Reported Results: COC concentrations tend to be decreasing, except for chlorinated solvents in a few wells. The off-site wells BMW-6A and BMWD-1 showed an increasing trend in chlorinated solvent concentrations, which prompted the DEQ to drill additional wells in the area.
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From page 386... ...
Technologies Applied: Source control and groundwater monitoring Reported Results: The results from the 2006 sampling event showed pit concentrations of barium, lead, zinc, and TOC, the COCs for the site, consistent with previous sampling rounds. The results provided no indication that the site was negatively impacting groundwater.
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From page 387... ...
State: AR Site Lead: EPA Date Deleted from NPL: April 2008 Date of Last Five-Year Review: September 26, 2007 COCs: Methylene chloride, toluene, PAHs, heavy metals including nickel, chromium, and lead RAOs: Protection of human health and the environment Technologies Applied: Off-site disposal; solidification of soil; slurry wall to prevent contamination of groundwater; natural attenuation; groundwater monitoring Reported Results: No numeric results are given. During September 2003, two monitoring wells recorded higher than baseline levels of contaminants.
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From page 388... ...
. Technologies Applied: Emergency removal action Reported Results: No numeric results given, but the fact sheet states that no hazardous substances remain at the Site above levels that prevent unlimited use and unrestricted exposure.
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From page 389... ...
Yes ICs in Place? None listed Vapor Intrusion: Not applicable Long-Term Monitoring?
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From page 390... ...
. Technologies Applied: Five emergency removal actions; Pump and treat, groundwater monitoring Reported Results: The data review determined that the shallow groundwater, when compared to the Risk Evaluation and Corrective Action Program Groundwater Screening Standards values, is not contaminated above levels that pose an unacceptable risk.
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From page 391... ...
Technologies Applied: Monitored natural attenuation Reported Results: No specific results listed but the fact sheet says that the groundwater is no longer contaminated. According to the last five-year review says "For the ground water OU, nine monitoring wells were sampled during eight sampling events in 2002 and the analytical results confirmed that the source area treatment and natural attenuation processes in the aquifer have reduced the metal concentrations below the remedial goals specified in the 1998 ROD Amendment.
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From page 392... ...
Technologies Applied: Groundwater monitoring and natural attenuation Reported Results: Pesticide contaminant concentrations have been shown to be below standards for three consecutive sampling events (November 1997 through November 1999) but benzene concentrations in MW-13 and MW-22 continue to indicate concentrations above action levels.
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From page 393... ...
The baseline risk assessment indicated groundwater contamination did not pose a significant threat to human health. Technologies Applied: Groundwater monitoring will be conducted for the first five years to verify that no unacceptable exposures posed, by conditions at the site, occur.
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From page 394... ...
Technologies Applied: Groundwater monitoring and an upgradient groundwater diversion wall Reported Results: Tables in the most recent five-year review (2010) show contaminant concentrations above MCLs in some wells during 2004-2009 monitoring (for example, M0479-A: arsenic 653 µg/L and 1,1,2-TCA 10,600 µg/L in May 09)
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From page 395... ...
Yes ICs in Place? No Vapor Intrusion: No.
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From page 396... ...
Dump State: IA Site Lead: EPA Date Deleted from NPL: October 30, 2000 Date of Last Five-Year Review: June 22, 2009 COCs: Benzene, cadmium, chromium, and lead RAOs: Prevent further migration of contaminated groundwater and reduce levels of contaminants below established health-based standards for drinking water [benzene 1 µg/L (MCL is 5) , cadmium 5 µg/L, chromium 100 µg/L, and lead 50 µg/L -- action level is 15]
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From page 397... ...
. Technologies Applied: Slurry wall/cap Reported Results: Results from groundwater monitoring suggest that contamination from the waste material remains contained.
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From page 398... ...
Technologies Applied: Groundwater monitoring Reported Results: No groundwater results provided in the most recent five-year review. MCLs Achieved?
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From page 399... ...
and to the health-based level of 10 µg/L for 1,2-dichloropropane (federal MCL is 5) Technologies Applied: Pump and treat and groundwater monitoring Reported Results: By October 1997, both the groundwater and soil cleanup levels for 2,4-D had been achieved.
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From page 400... ...
federal MCL 1,1 dichloroethylene 6 7 1,1 dichloroethane 5 none 1,1,1 trichloroethane 70 200 1,2 dichloroethane 0.5 5 Tricholorethene 0.7 5 Benzene 0.7 5 Toluene 20 1000 Ethylbenzene 10 700 Xylene 70 10,000 Technologies Applied: Pump and treat, groundwater monitoring, and natural attenuation Reported Results: The final sampling occurred on July 28, 1998 with only two wells showing contamination above cleanup standards: well S09 containing 55 µg/L of 1,1-DCE and OW4 containing 11 µg/L of 1,1-DCE. These wells are in the shallow zone and are located approximately 250-300 feet from the facility.
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From page 401... ...
No, there are no institutional controls required as part of the remedy for the Firestone site. Vapor Intrusion: Not mentioned Long-Term Monitoring?
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From page 402... ...
Army Date Deleted from NPL: August 30, 2000 Date of Last Five-Year Review: September 24, 2007 COCs: Trichloroethene RAOs: Reduce level of TCE contamination to drinking water standards only at point of use. A technical impracticability (TI)
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From page 403... ...
(Visalia Poleyard) State: CA Site Lead: EPA Date Deleted from NPL: August 27, 2009 Date of Last Five-Year Review: July 21, 2010 COCs: Pentachlorophenol, benzo(a)
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From page 404... ...
State: CA Site Lead: EPA Date Deleted from NPL: August 29, 2001 Date of Last Five-Year Review: September 18, 2008 COCs: 1,1-DCE, 1,1,1-TCA, 1,1-DCA, and TCE RAOs: Reduce contamination to the following levels: 1,1-DCE to 7 µg/L; 1,1,1-TCA to 200 µg/L; 1,1-DCA to 5 µg/L; and TCE to 5 µg/L. Technologies Applied: Groundwater monitoring and pump and treat Reported Results: Analytical results indicated that 1,1-DCE, 1,1,1-TCA, and TCE continue to be present in the groundwater at concentrations below the Federal and State MCLs.
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From page 405... ...
Technologies Applied: None for groundwater Reported Results: None reported MCLs Achieved? Not applicable, as there was likely little groundwater contamination to begin with ICs in Place?
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From page 406... ...
Vapor Intrusion: Not mentioned Long-Term Monitoring? Yes, for five years after cleanup to make sure there was no contaminant migration from soil to groundwater.
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From page 407... ...
Yes, there are deed, land, and groundwater use restrictions. Vapor Intrusion: Not mentioned Long-Term Monitoring?
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