SITE INFORMATION AND CORRESPONDENCE FILE 2

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Former Georges Servi• • Page 2 1600 Durham Ferry Road 30 April 2008 Tracy, CA 95376 injection of any materials that may alter groundwater quality or aquifer quality. The EHD has no recent experience with the injection of ORC, but intuitively it seems that injection of the ORC-Advanced slurry into the aquifer may degrade aquifer quality by reducing both porosity and permeability. Please provide information regarding the effect of the proposed injectant on aquifer quality for the EHD's further evaluation of the proposal and for the CVRWQCB to determine if preparation of a W DR permit will be required. You may proceed with the approved portion of the work plan while the issue with the ORC-Advanced injection is being resolved; the EHD believes the ORC injection should be a later phase of work as both the AS pilot test and the ORC- Advanced application incorporate dissolved oxygen measurements in monitoring well MW-7, therefore the ORC-Advanced application should not be made before the AS pilot test has been completed. Also, the proposed ORC installation points, in the roadway are in a high traffic area and a traffic control plan accepted by the appropriate traffic agency for that location must be properly implemented for worker and motorist safety. Submit a copy of the approved traffic control plan to the EHD before any work in the public-right-of-way is initiated. Submit a well permit application with the appropriate fees, ($89 permit fee, $294 inspection fee — total $383) for each parcel and/or drilling contractor, to the EHD by June 16, 2008. Questions or comments may be directed to Nuel Henderson at (209) 468-3436. Nuel C. Henderson, Jr., PG Margare Lagod REHS Engineering Geologist Program Coordinator c: Mr. James L.L. Barton, PG — CVRWQCB, 11020 Sun Center Dr. #200, Rancho Cordova, CA 95670 Dr. Ray Kablanow, PG —Geological Technics Inc., 1101 Seventh St., Modesto, CA 95354 WP Comment Letter 0408.doe