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ISCO Injection Project California Army National Guard FMS #24 Stockton, CA Environmental Cost Management, Inc. (ECM) is performing work on behalf of the California Army National Guard (CA ARNG), under Contract W912P7-12-D-0001, Task Order CQ01, with the U.S. Army Corps of Engineers (USACE) Los Angeles District under an approved Remedial Action Work Plan (RAWP). The work includes the installation of temporary injections points and injection of in-situ chemical oxidation (ISCO) to remediate impacts from former underground storage tanks (USTs) at the CA ARNG Field Maintenance Shop (FMS) #24 in Stockton, California. See attached boring plan. The objectives of the project are to: • Implement a second round of ISCO injections to reduce petroleum hydrocarbons mass and related compounds in the soil and groundwater of the source zone area in the immediate vicinity of former UST locations; and • Further evaluate ISCO effectiveness in reducing anticipated cleanup times required for natural attenuation or other remedial options. To achieve the stated project objectives, the following scope of work has been developed: • Install 36 temporary injection points within the source zone area. o Injection points will be installed using direct push technology (DPT). o Vertical treatment zones consists of a primary target interval approximately between 35 to 45 feet (ft.) below ground surface (bgs) and a secondary interval from 25 to 35 ft. bgs in the vicinity of FMS-MW6. • Inject approximately 16,335 gallons of ISCO reagent into the subsurface over a period of eight (8) days. o The ISCO injections will be performed in two 4 -day events each consisting of 18 injections points. The injection events will be separated by four (4) full weeks. o Approximately 1,800 to 2,000 gallons of ISCO reagent will be injected into 4 to 5 injection points per day. o In -field process monitoring will assess and allow adjustment of the ISCO reagent injection process, if necessary. Perform post-treatment groundwater sampling prior to, and following implementation of ISCO technology, respectively. o Groundwater samples will be collected from five (5) site wells (FMS-MW1, FMS - MW -5, FMS -MW -6, FMS -MW -7, and FMS -MW -9) to establish ongoing groundwater conditions and to confirm compliance with the requirements of the Waste Discharge Requirements (WDRs). All soil boring/injection locations will be advanced via direct push methods and abandoned per SJEHD regulations. Proposed boring locations are shown in the attached boring plan. Page 1 of 1