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L + <br /> September 24, 1992 <br /> , <br /> Mr. Brien Piper <br /> � . . . <br /> Director <br /> Shields National Inc. <br /> 8530 Wilshire Blvd., Suite 301 <br /> Beverly Hills, CA 90211 <br /> Dear Mr. Piper: <br /> The EPA Test Methods for Evaluating Solid Waste (SW-846) Manual <br /> provides three methods for pH analysis as required to comply with both <br /> California Code of Regulations, Title 22, Article 11, Appendix III, Table 3 <br /> and EPA RCRA regulations. These methods are: <br /> Aqua Term Technologies Method 9040: pH Eleetrometrie Measurement <br /> Consulting Engineers Method 9041: pH Paper Method <br /> &scientists Method 9045: Soil pH <br /> 2950 Buskirk Avenue The first method, Method 9040: pH Eleetrometric Measurement, is used to <br /> Suite 120 measure aqueous (liquified) waste or multiphase (both solid and liquid) where <br /> Walnut creek,CA the liquid phase is at least 20% of the total volume of the waste. Method <br /> 94596-2079 9041: pH Paper Method, is designed to measure wastes that have very high <br /> FAX 934-04is (approximately 13) or very low pHs (approximately 2) and where Method <br /> 510 934-4884 9040 is not possible. Method 9045: Soil pH, is an electrometric procedure <br /> which is approved for measuring pH in calcareous (calcium carbonate <br /> containing) and noncalcareous soils. Method 9045 is the only appropriate <br /> method suitable for the analysis of dry ash. <br /> If you have any questions or require more information regarding any of these <br /> methods, please feel free to call. <br /> Very truly yours, <br /> AQUA TERRA TECHNOLOGIES, INC. <br /> aul C. Lessard, Ph.D. <br /> Senior Environmental Chemist <br /> lonfald MBloc Ph.D. <br /> Environmental Toxicologist <br /> PCL/RMB:pd <br /> 929397/DKi/SHIELDS.LEr <br />