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DiiS[GN; ! <br />John W. Johnson <br />Co -President <br />Architect <br />Brian F. Zita <br />Co -President <br />Architect <br />John B. Hicks <br />Vice President <br />Cecil R. Spencer <br />Vice President <br />Regional Managers <br />Jesse E. Macias <br />Roy W. Pedro <br />Alan K. Shimabukuro <br />John W. Strobel <br />Blythe R. Wilson <br />Offices <br />BELLEVUE, WA <br />LA HABRA, CA <br />MARTINEZ, CA <br />PETALUMA, CA <br />SACRAMENTO, CA <br />SCOTTSDALE, AZ <br />VANCOUVER, WA <br />www.rhldesigii.com <br />L] <br />ARC 11 ITFCTURE E N G I N E E R I N G <br />1137 N. McDowell Blvd., Petaluma, CA 94954 <br />March 14, 2003 <br />John Rowe <br />Diversified Products Mfg. LLC <br />5523 Bagget-Marysville Road <br />Oroville, CA 95965 <br />C7 <br />ENVIRONM ENTAL SERVICES <br />Telephone: (707) 765-1660 Facsimile: (707) 765-9908 <br />RE: THIRD PARTY APPROVAL <br />CCR Title 23 Division 3, Chapter 16 Section 2631(d) <br />NEW CONSTRUCTION PRODUCTS <br />Threaded Bulkheads <br />Single Sided B2, B3, B5 & B6 <br />Double Sided B2D, B3D, B5D & B6D <br />Studded Bulkheads <br />Single Sided 4S, 8S, IOS, 12S <br />Double Sided 4D, 8D, IOD, 12D <br />Filled 4F, 8F, l OF, 12F <br />Terminating and Test Reducer <br />Inserts <br />Bulkhead Installation Kit BIK <br />Bulkhead Bonder DBB <br />Bulkhead Cleaner DBC <br />Bulkhead Fill DBF <br />Soil Barrier SB -I 1 <br />I have reviewed the following materials on these products: <br />1. Material specifications, test reports and data sheets. <br />2. Manufacture's Installation Instructions. <br />3. Manufacture's Application Bulletins <br />4. Representative samples of items. <br />5. Manufacture's Master Catalog <br />In my opinion the design of these products as shown in the manufacture's materials are based on <br />sound engineering principles and the materials are compatible with all motor fuels and additives <br />currently being used. <br />RHL DESIGN GROUP, INC. <br />Ja es H. Ray <br />Senior Civil Engineer <br />