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Hayes-Sammons Warehouse

No further Superfund remedial activities is needed on this former commercial grade pesticide storage site in Mission, Hidalgo County.

Site Background

The Hayes-Sammons Warehouse site (the site) is located at Miller Avenue and East Eighth Street, in downtown Mission. From 1945 to 1968, two warehouse buildings (one brick, the other metal) were used by Hayes-Sammons Chemical Company for the storage of commercial-grade pesticides on property leased by Union Pacific Railroad. The buildings had wood floors, which allowed the release of contaminants into the soil. No pesticides are still in storage.

Superfund Actions Taken to Date

  • July 25, 1986, a legal notice was published in the Texas Register (11 TexReg 3421-3422) announcing a series of public meetings across the state to collect information and receive comments on constituting the initial state Superfund registry. The notice announced a hearing would be held at the Coastal Bend Council of Governements Conference Room in Corpus Christi on August 26, 1986, and a second hearing would be held at the Stephen F. Austin Building on August 28, 1986.
  • January 16, 1987, Hayes-Sammons Warehouse became 1 of 10 sites on the first Texas Superfund registry (12 TexReg 205).
  • January 8, 1988, an administrative order was issued to determine the nature and extent of contamination (RI/FS).
  • August 1988, Phase I of the remedial investigation under way.
  • December 1988, remedial investigation contractor delivered the first draft of results.
  • January 24, 1989, after the draft was reviewed, the contractor was ordered to conduct additional investigation.
  • May 1989, Phase II of the remedial investigation got under way.
  • July 24, 1991, the remedial investigation report was approved and the baseline risk assessment was initiated.
  • October 30, 1992, the baseline risk assessment report was reviewed and approved.
  • September 1, 1993, effective date of the creation of the Texas Natural Resource Conservation Commission from the joining of the Texas Water Commission and the Texas Air Control Board and a portion of the Texas Department of Health.
  • March 19, 1996, the feasibility study was approved, marking completion of the remedial investigation/feasibility study phase.
  • June 4, 1996, a legal notice was published in the Texas Register (21 TexReg 5124) to present the proposed cleanup alternative, which was excavation and off-site disposal of approximately 1,700 cubic yards of contaminated soil and demolition and off-site disposal of the warehouses on the site. A public meeting to receive citizen comments was to be held at the Speer Memorial Library in Mission on July 23, 1996.
  • July 23, 1996, a public meeting was held at Speer Memorial Library in Mission to
    receive comments on the proposed cleanup alternative, which was excavation and off-site disposal of approximately 1,700 cubic yards of contaminated soil and demolition and off-site disposal of the warehouses on the site.
  • December 12, 1996, a public meeting was held at the City Council Chambers in Mission to receive comments on a change in the remedial action specifications from residential to nonresidential cleanup level.
  • July 21, 1997, a final administrative order was issued setting cleanup levels, selecting the remedy for cleanup, and establishing rules, responsibilities and enforcement options for remedial design/remedial action.
  • February 19, 1998, remedial design of the selected site remedy was completed; remedial action phase under way.
  • June 25, 1998, the Union Pacific Railroad Company contractor demolished three storage buildings and plugged seven monitoring wells.
  • July 15, 1998, Union Pacific Railroad Company began excavation of contaminated soil.
  • July 29, 1998, excavation substantially complete.
  • October 1, 1998, remedial action completed. All removed materials were transported off-site to a permitted disposal facility and all excavated areas were backfilled, graded and hydro-mulched to provide a vegetative cover.
  • January 13, 1999, the 1997 administrative order was amended.
  • April 5, 1999, remedial action report approved by TNRCC.
  • September 17, 1999, a legal notice was published in the Texas Register (24 TexReg 7963-7964) and the Mission Progress Times proposing to delete the site from the state Superfund registry in accordance with 30 TAC §:335.344(c) and inviting public comment on the determination that the site no longer presented an imminent and substantial endangerment to public health and safety or the environment.
  • October 15, 1999, a request for a public meeting was received, requesting a delay in the deletion of the site from the state Superfund registry.
  • October 16, 1999 state Superfund registry deletion process was put on hold.
  • March 15, 2000, TNRCC advised the community that additional soil sampling was tentatively scheduled during the week of March 27, 2000. When soils sampling results have been reviewed and evaluated, TNRCC will conduct a public meeting to share the information and address any other public concerns.
  • April 4, 2000, additional field sampling was conducted on the site.
  • May 9, 2000, TNRCC received the report of the additional field sampling. The report showed that the on-site soils sampling met the requirements of the administrative order.
  • January 11, 2001, TNRCC submitted access agreements to conduct sampling of residential yards near the site.
  • March 20, 2001, in response to concerns from some residents of the City of Mission, the TNRCC conducted soils sampling of residential yards nearest to the site. The soils were sampled for arsenic and pesticides.
  • April 16, 2001, TNRCC received the data validation report from TNRCC's contractor which showed the results of soils sampling of residential yards nearest to the site. The results showed that the soils in these yards are below the health protective levels for residents, which means that levels in the yards do not pose a health threat to the residents.
  • April 2002, TNRCC agreed to test additional residential properties near the site to address community concerns, as part of an additional sampling effort regarding the site, as well as a former pesticide mixing plant site, the Helena Chemical Co.
  • September 1, 2002, effective date of the name change from Texas Natural Resource Conservation Commission (TNRCC) to Texas Commission on Environmental Quality (TCEQ).
  • April 2002-January 2003, the TCEQ contractor sampled an additional 46 residential properties outside the boundaries of the site as it was proposed to the state Superfund registry. No contaminants were found that could be linked to the Hayes-Sammons Warehouse site. The site is now pending deletion from the state Superfund registry.

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Site Specific Information

EPA ID : TXD980697882
Location : Mission, Hidalgo County
Type of Facility : Commercial Grade Pesticide Storage
Category : Listed on Registry
Media Affected : Soil
Latitude : 26º12'53"N
Longitude : -98º19'24"W
Hazard Ranking Score (HRS) : 12.8
Contaminants at time of HRS : Aldrin, Arsenic, BHC (Lindane), DDT, Dieldrin, Endosulfan
TCEQ Region : Harlingen - 15
Funded by : Potentially Responsible Parties

Contact Information

Superfund Program Contact
John Flores
Phone: 512-239-5674 or 1-800-633-9363

Records Repositories

Speer Memorial Library
801 E. 12th Street
Mission TX  78572

TCEQ Central File Room
12100 Park 35 Circle Building E,
First Floor Room 103
Austin, TX 78753
512-239-1850 (fax)

Required use of SW-846 Method 5035

New Information

Beginning January 1, 2016, the TCEQ Remediation Division will require the use of United States Environmental Protection Agency (USEPA) SW846 Method 5035A, Purge-and-Trap and Extraction for Volatile Organics in Soil and Waste Samples, as amended, for the collection and preparation of solid samples for volatile organic compound (VOC) analysis using purge-and-trap technology.

The TCEQ Remediation Division guidance on Method 5035 has been updated and is available.