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11 <br />C <br />%XI=W41aN /[fly C� ►7�. <br />The leachate fate analyses that were completed for this project indicate that a single <br />composite liner will provide adequate protection to groundwater beneath the Forward <br />Landfill. Of note, the proposed landfill expansion will be accomplished using state-of- <br />the-art materials, rigorous construction quality assurance practices, and exceptional post - <br />construction testing to verify the integrity of the constructed liner product. The clayey <br />character of the 17 -foot -thick vadose zone soils underlying the site, provides a significant <br />buffer for any leachate leaks that do occur. The MULTIMED simulations that were <br />completed for the project indicate that unsaturated leachate migration through the vadose <br />zone requires an exceptionally long period and results in essentially non-detectable <br />changes in groundwater chemistry. Even ignoring the dispersion and biodegradation <br />processes that are expected to occur within the clay liner and the vadose zone, the <br />calculated impacts to groundwater associated with direct mixing of leaking leachate and <br />groundwater are also essentially non-detectable. <br />This report is based on the limited data referenced herein. Our firm should be notified if <br />conditions are found that differ from those described in this report, since this may require <br />a re-evaluation of the conclusions and recommendations presented herein. This report <br />has not been prepared for use by parties and projects other than those named or described <br />herein. It may not contain sufficient information for other parties or other purposes. <br />This report has been prepared in accordance with generally accepted geologic and <br />hydrogeologic practices, and makes no other warranties, either expressed or implied, as <br />to the professional advice or data included in it. <br />GeoLogic Associates <br />& 44 <br />Ralph A. Murphy, CEG, CHg. <br />Principal Engineering Geologist <br />Mtn <br />Gary L. Lass, CEG, CHg. <br />President <br />Attachments: Table 1 — Typical Data on the Composition of Leachate (Tehobanoglous) <br />Table 2 — Organic Constituents of Leachate (USEPA) <br />Table 3 — Average Forward Landfill Leachate Concentrations <br />Attachment A — MULTIED Input/Out <br />C:\2002-002\Revised Appx A - Leakageldoe\09/19/02 11 <br />GeoLogic Associates <br />