PSA - Groundwater Remedy and Quarterly Sampling Plan - Oliver Industrial Park - Hull and Assoc.

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Hull & Associates Inc. Page 5 OBJECTIVE It shall be the objective of IET to promote the conditions in -situ, necessary for accelerated dechlorination via both abiotic and microbial processes along three permeable reactive barriers (PRB). Further, through the introduction of a 1-3 micron zero valent iron colloidal suspension, reduction of the dissolved phased CVOCs will occur while initiating the production of hydrogen for microbial mineralization processes in order to mitigate off -site migration and further stream impact. The remedial plan described herein is designed to treat source area and residual contamination through reductions of CVOCs in the saturated zones. No additional equipment or maintenance will be required and because no waste streams will be generated, no disposal permitting will be required during the remedial effort. IET proposes to implement a program, which shall: • Supply all essential microbial elements necessary for dechlorination processes to occur. • Introduce zero valent iron (ZVI) to further and quickly address dissolved phase compounds while acting synergistically with the anaerobic processes. A map of the site and the proposed PRB locations is presented below. PERMEABLE REACTIVE BARRIERS U.T. -t PRB-A encompasses approximately an area of 6,280 square feet. This area will be treated with a 25 foot vertical contaminated zone from 20-45 feet below ground surface (bgs). An injection radius of 20 feet is proposed to treat the area. Based on the area to be treated and the injection radius, 5 injection points would be required to treat the area with 5 injection intervals at 23-25, 28-30, 33-35, 38-40 and 43-45 feet bgs. Soil concentrations are assumed to be moderate to low