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Solid Waste Management Unit (SWMU) 26 covers approximately 501 acres in the north-central portion of the former SFAAP. SWMU 26 is located west of the Nitrocellulose Production Lines [Area of Concern(AOC)16], southeast of the Nitroguanidine Production Facility (AOC 17) and north of the Nitroglycerine Production Area (SWMU 24). SWMU 26 contains over 650 accounts and subaccounts including production buildings and support facilities such as aboveground storage tanks and water towers; and oil, motor, pump, blower, valve, and elevator Houses. 399 accounts have been designated as Munitions and Explosives of Concern (MEC) by the Army. After the Army's clears the MEC hazard then the buildings/accounts will be addressed under the AOC 23/24 scopes of work. AOC 23 is the Cleanup of Under Explosives Foundations and AOC 24 is the Cleanup of Under Explosives Sewers. SWMU 26 consists of three (B, C, & D) single-base solvent propellant production lines, two (E & G) double-base solvent propellant lines, and the solvent Paste (or Pre-Mix) Area for the E-Line. Transport of materials and product included a tram system (narrow-gauge rail system), handcarts or ‘buggies’ for short distances between buildings along covered Wheeling Walks, and a ‘Telpher’ or conveyor belt system. For the non AOC23/24 portions of SWMU 26 a RCRA Facility Investigation (RFI) will be performed prior to remediation.

Single-base solvent propellant was produced from 1943-1946 and double-base propellant was produced from 1943 and 1946, and 1951 and 1960. D-line was reportedly converted to produce triple-base propellant in 1953 and never used. SWMU 26 production buildings were not used after 1960, since only solventless rocket propellant was produced at SFAAP after 1965, following a 5-year standby.

The potential contaminants at SWMU 26 include heavy metals (e.g., lead, arsenic, nickel, mercury, and manganese), nitrocellulose, explosive compounds (nitroglycerin, nitroguanidine, guanidine nitrate, and 2-6 dinitrotoluenene), Semivolatile organic compounds, volatile organic compounds, total petroleum hydrocarbons-diesel range organics, ammonia, nitrate/nitrite, sulfate, pesticides (termiticides), and asbestos soil.

Sunflower Redevelopment, LLC (SRL) reported at Restoration Advisory Board meeting on August 3, 2011, to-date they have excavated and disposed of about 216,255 tons of contaminated soil in the area that includes AOC 23/24 within SWMU 26. Of which about 167,971 tons was asbestos contaminated soil and about 46,138 tons of pesticide contaminated soil. SRL initiated a work suspension in July 2011 prior to completing the AOC 23/24 remediation, and the RFI.

Previous investigations and activities relating to SWMU 26:
• Hazardous Waste Study (USAEHA, 1985);
• RCRA RFI Addendum and Quality Control Summary Report, SWMU 26 (B&McD, 2001) (ITS data)
• Relative Risk Site Evaluation (RRSE) (Battelle, 2003);
• RCRA RFI Addendum Field Sampling Work Plan (Shaw, 2003)
• Sitewide Stabilization Treatability Study (SSTS) (Shaw, 2005)
• Correlation Study (Tetra Tech, 2006a)
• Interim corrective measures implementation work plan for AOC 23 rind soil at SWMU 26 and 63, and AOC 11 and 16 (Tetra Tech, 2007)
• Interim corrective measures implementation work plan for AOC 23/24 subfoundation and sewer soil at SWMU 26 and 63, and AOC 11 and 16 (Tetra Tech, 2009)
• RCRA Facility Investigation Work Plan (Tetra Tech, 2009)