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1111111111111111111 <br /> 999 <br /> PHILLIPS FIBERS CORPORATION ,�1;P lfT�, <br /> A SUBSIDIARY OF PHILLIPS 66 COMPANY <br /> ENGINEERED PRODUCTS MARKETING <br /> WESTERN REGION OFFICE v /^;` <br /> 1900 POINT WEST WAY,SUITE 261 �� l 77- 3 7 ,V U c, <br /> SACRAMENTO,CALIFORNIA 95615 U <br /> (916)924-3151 <br /> (600)952-5769(California) <br /> (600)437-66W <br /> �,May 24, 1993 <br /> Larry Perino I�, <br /> SUNNYSIDE GOLD CORPORATION <br /> P. O. Box 177 <br /> Silverton,��CO 81433 <br /> Re: /Soil Contact Survivability of Supac <br /> Dear Larry: <br /> This is in response to your request for information on the life <br /> expectancy of Supac* nonwoven geotextiles in soils. Supac nonwoven <br /> geotextiles are manufacture from polypropylene fibers. <br /> Polypropylene fabric are considered inert in soils within a 3 to 12 <br /> pH range. Polypropylene is unaffected by most alkalies and acids, <br /> nor does it support growth of mildew or fungi. <br /> Examples of field test reports are: <br /> "Effects of Soil Burial Exposure on the Properties of Molded <br /> Plastics: , R. J. Miner, Bell System Technical Journal, Jan. <br /> 1972 . Test started in 1956. Results in 1971 showed no <br /> changes in polypropylene. Sites included Roswell, New Mexico, <br /> pH range 5. 3-7.9. Note: The communications industry uses <br /> polypropylene in soil burial applications. <br /> "Long Term Insitu Properties of Geotextiles", Huffman & <br /> Turgeon, Pennsylvania Dept. of Transportation, Transportation <br /> Research Board 1983. The conclusion to this report states: <br /> "Engineering fabrics can be expected to effectively function <br /> as a filter and separator in a drainage trench application for <br /> years. The fabrics should be included as a standard part of <br /> the drainage system design where open-graded aggregate <br /> backfill requires protection from adjacent, low plasticity <br /> fine soils that are prone to migrate. " <br /> "Burial Test of Geotextiles", Textile Chemistry Division, <br /> National Research Council of Canada, D. J. Carlson, Soil <br /> Burial of Supac nonwoven polypropylene fabric showed no <br /> significant changes after four years of burial. <br /> 'Trademark Phillips Petroleum Company <br />