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Californipoegional Water Quality Co of Board Central Valley Region Karl E. Longley, ScD, P.E., Chair (@ Linda S. Adams Secretary for Sacramento Main Office Environmental 11020 Sun Center Drive #200, Rancho Cordova, California 95670-6114 Protection Phone (916) 464-3291 • FAX (916) 464-4645 http://www.waterboards.ca.gov/centralvalley 21 June 2007 Andrew Keller, Environmental Manager Sims Hugo Neu 901 New Dock Street Terminal Island, CA 90731 Arnold Schwarzenegger C� Governor The Regional Water Quality Control Board (Regional Water Board) staff has reviewed the letter "Evaluation of the Need for a Slope Stability Analysis" (Letter) for the Cove Contractors Landfill (Discharger) received on 20 May 2007. The Discharger is constructing a Title 27 final cover under Cleanup and Abatement Order No. R5-2006-0707. Under Title 27, a slope stability analysis is required when the final cover slopes are steeper than a 3:1 grade (horizontal to vertical). The Discharger's Letter was submitted in response to the Regional Water Board staffs 11 April 2007 stipulation to determine the slope grades. Based on slope grades, a slope - stability analysis may be required under Title 27 §21090. The Letter states that the slopes were shallower than a 3:1 grade, but technical data was not provided. The Discharger also proposed that a Report of Waste Discharge be submitted to the Regional Water Board staff. Based on staffs review of the Letter, the Discharger may submit a Report of Waste Discharge. In addition, the Discharger shall provide technical information to support their premise that the slopes are shallower than 3:1. As outlined below, please provide the following: By 31 July 2007, please provide a scaled and labeled drawing showing the steepest grade at each of the five sides of the landfill cover. The Discharger shall provide supporting text and tabulated data to document the slope grades. At a minimum, the Discharger shall provide the level of technical detail necessary to support conclusions, including the following information: a. On the drawing, the Discharger shall label the toe and the shoulder of each slope being evaluated and shall label the height of the contour elevations at the toe and shoulder of each slope, b. On the drawing, the Discharger shall delineate and provide the horizontal distances and dimensions from the toe of each slope to the shoulder of each slope. c. In the supporting text, the Discharger shall provide sufficient technical data to demonstrate the slope grades. The horizontal run, vertical rise, and slope for each case shall be documented in tabular format and cross-referenced to the drawing. d. The Discharger's technical evaluation and drawing shall be stamped by a licensed California Civil Engineer. California Environmental Protection Agency cd, Recycled Paper