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/ it <br />U0 <br />Emcon <br />ASSOCIATES <br />Consultants in Wastes <br />Management and <br />Environmental Control <br />Mr. Robert Evans <br />California Regional Water Quality <br />Control Board <br />Central Valley Region <br />3443 Routier Road <br />Sacramento, California 95827-3098 <br />Re: Seismic Evaluation <br />Dear Mr. Evans: <br />RECEIVED <br />FEB 1 1991 <br />ENVIRONMENTAL HEALTH <br />PERMIT/SERVICES <br />January 30, 1991 <br />Project B02-02.03 <br />This letter presents the results of the seismic evaluation required by the <br />California Regional Water Quality Control Board (RWQCB) as requested in a <br />letter dated August 28, 1990, for completion of the Report of Waste Discharge at <br />the French Camp Landfill located in Stockton, California. This letter is submitted <br />on behalf of the City of Stockton. <br />REGULATORY FRAMEWORK <br />An evaluation of the maximum credible earthquake (MCE) was conducted for the <br />French Camp Landfill to develop estimates of design ground accelerations that <br />may occur at the site. The MCE is defined as the maximum earthquake that ap- <br />pears capable of occurring under the presently known tectonic framework. <br />Because the French Camp Landfill is a Class III landfill, the California Code of <br />Regulations, Title 23, Division 3, Chapter 15, Article 9, Section 2595 (f)(5) re- <br />quires only an evaluation of the maximum probable earthquake (MPE). Because <br />an MPE evaluation requires substantial data on earthquake recurrence intervals, <br />which are generally inadequate for many faults near the site, MPE estimates <br />were not developed for the French Camp Landfill. Rather, MCE estimates were <br />used for the site resulting in more conservative estimates of earthquake magni- <br />tude (i.e., larger magnitude) and corresponding mean peak bedrock acceleration <br />(i.e., larger accelerations). <br />pjb\b02\bO2O2O3e <br />1433 N. Market Boulevard, Sacramento, California 95834, (916) 928-3300 <br />