SITE INFORMATION AND CORRESPONDENCE

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0 • Mr. Brian Miller - 4 - 2 June 2006 tabular format within 45 days of the monitoring event, with a hard copy summary accompanying the quarterly reports, which are due within 30 days of the end of the quarter. When the timing of quarterly reports coincide with that of semi-annual reports required by the Monitoring and Reporting Program, the two reports may be combined. GeoSyntec will evaluate the pilot study after one year, and will provide an Evaluation Report within 90 days of the anniversary of the injection date. Public Participation The pilot study treatment area is about 100 feet upgradient of residences, and the groundwater plume underlies a residential neighborhood. Western Farm Service needs to notify the community about the groundwater quality, provide an overview of the pilot study, its role in developing long-term solutions to groundwater pollution, and a contact that they can call for further information. You may list Regional Water Board staff as a contact. Notification may take the form of a fact sheet distributed to residents and homeowners in the community lying between the Western Farm Service facility and Gianone Park. Please provide a draft fact sheet and the area of distribution to Regional Water Board staff for review and concurrence. The fact sheet should be prepared and distributed with sufficient time for Regional Water Board staff to consider comments and incorporate changes to the Pilot Test Work Plan before the EHCTM is injected. Summary Regional Water Board staff conditionally concur with the proposed pilot study using EHCTM, a carbon-amended zero valent iron, in the manner of delivery described in the Pilot Study Work Plan, and as diagrammed in Figure 1. Please incorporate the following conditions into your Work Plan before proceeding: • Prepare a draft fact sheet identifying groundwater pollutants and distribution, and describing the pilot study and its purpose. Provide this draft fact sheet and the intended area of distribution to Regional Water Board staff by 14 July 2006. • Add analyses for dissolved manganese and carbon dioxide to the quarterly analytical suite. • Monitor performance well PM-1 monthly for the first three months following injection for the following constituents: 1,2,3-TCP, 1,2, -DCP, EDB, DBCP, nitrate, dissolved iron, alkalinity, oxygen-reduction potential, dissolved oxygen, pH, and temperature. Regional Water Board staff applaud Western Farm Service's proposal to use EHCTM the carbon-amended zero valent iron, in the pilot study. The combination of iron and carbon are expected to rapidly reduce the chlorinated compounds, remove nitrate, and lower ammonium concentrations. Zero valent iron in conjunction with carbon-based compounds has worked well in other in-situ remediation trials where nitrate and chlorinated organic compounds were also present in the groundwater (February 2005 Permeable Reactive Barriers: Lessons Learned/New Directions, Interstate Technology & Regulatory Council). We look forward to watching the progress of the treatment. As proposed by Ms. Kneiblher in our 31 May 2006 telephone conversation, it is anticipated that the draft fact sheet will be transmitted to Regional Water Board staff by 14 July 2006, the monitoring wells will be installed by 15 July 2006, the hydraulic