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Mr. Tom Horton Project 939-02.31 December 4, 1991 Page 2 background concentrations for appropriate indicator parameters and waste constituents. Possible leakage of a landfill was defined as a statistically significant exceedance of a WQPS in a point of compliance well. On July 1 , 1991, revisions to Article 5 became effective. Revised Article 5 rede- fines WQPS. One element of the redefined WQPS is the "concentration limit," which is analogous to the WQPS under repealed Article 5. In this letter, proposed WQPS for the North County Landfill have been developed within the context of the WDR and, hence, repealed Article 5. It is not the intent at this time to meet the monitoring program requirements of the revised article, which requires new monitoring programs for landfills to be proposed by June 30, 1992. The proposed WQPS, however, were developed using statistical methodology consistent with revised Article 5. Upon RWQCB approval, the proposed WQPS will be used at the site dur- ing detection monitoring to identify possible releases from the landfill. By June 30, 1992, a revised monitoring program for the site will be proposed pursuant to revised Article 5. WQPS MONITORING PROGRAM RESULTS As specified in the WDR, 1 year of monthly monitoring data were collected from background well G-1 and upstream surface-water monitoring points S-1 and S-2 for the development of WQPS. The samples were analyzed for the following constituents: Ground Water Surface Water Total Alkalinity Chloride Bicarbonate Alkalinity Nitrate-Nitrogen Carbonate Alkalinity Total Dissolved Solids Chloride Sulfate Nitrate-Nitrogen Total Organic Carbon Total Dissolved Solids Total Hardness Sulfate pH Total Organic.Carbon Electrical Conductivity pH Dissolved Iron Electrical Conductivity Total Manganese Dissolved Iron Dissolved Manganese PJ9\939\9390231 i