In Situ Chemical Reduction Interim Measures Work Plan for Hot Spot 3, Mobile Launcher Platform Rehabilitation Sites/Vehicle Assembly Building Area (SWMU 056), Kennedy Space Center, Florida

This document presents the design details of an In Situ Chemical Reduction Interim Measures Work Plan for Hot Spot 3 within Mobile Launcher Platform Rehabilitation Sites/Vehicle Assembly Building Area, Solid Waste Management Unit (SWMU) 56, located at the John F. Kennedy Space Center, Florida. The interim measures (IM) treatment zone encompasses an area identified as the High Concentration Plume, which is defined as the area with chlorinated volatile organic compound (CVOC) groundwater concentrations greater than their respective Natural Attenuation Default Concentration. The objective of the IM is to remove CVOC mass within the treatment area to levels that facilitate a transition to natural attenuation monitoring.

The IM design consists of the selected ISCR amendment, Provect-IR, which is a mixture of solid
reagents in a single product that promotes enhanced reductive dechlorination and ISCR. ProvectIR includes natural anti-methanogenic compounds; multiple hydrophilic, nutrient-rich organic
carbon sources; zero valent iron; chemical oxygen scavengers; and vitamin and mineral sources.
The proposed treatment area for this IM encompasses less than 1 acre and includes four vertical
treatment intervals to reach the NADC plumes that vary per CVOC and depth: 4 to 10 feet below
land surface (bls), 10 to 18 feet bls, 42 to 52 feet bls, and 54 to 58 feet bls. The amendment will
be distributed through 15 temporary injection points (IP01 through IP15) using dosing rates
ranging from 0.4% to 0.6% of soil mass within the treatment interval and a 20% slurry strength.
Dosage rates and slurry strength are based on groundwater geochemistry, soil characteristics, and
contaminant concentrations.

To aid in the evaluation of the ISCR IM performance, up to fourteen performance monitoring
wells will be installed following injections and sampled quarterly for the first year and
semiannually thereafter. CVOC parameters will be sampled until concentrations reduce to
below their NADC. Underground Injection Control (UIC) parameters will be sampled until
concentrations decrease to background levels or to levels that meet respective groundwater
standards. Prior to injections, background UIC parameters will be collected from one upgradient
monitoring well belonging to the low concentration plume monitoring well network. Sampling
frequency will be evaluated annually and modified as needed.

The path forward for the ISCR IM implementation includes preparing the IM Implementation
Work Plan, ISCR injections, monitoring well installation, performance monitoring, and
reporting.