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r <br /> TR-14, File No. M-77-378 <br /> Page 4 <br /> For this reason, the SDR rating is not critical but SDR <br /> 11 is proposed for use within the bulkhead . This <br /> alternate design would provide additional corrosion <br /> resistance over the accepted design in the event that the <br /> valve is not closed for some period of time after <br /> construction. <br /> All of the pipe designs are adequate for the proposed usage <br /> although alternate (b) would provide increased durability in <br /> the event that for some reason flow conditions would be <br /> anticipated for a very extended period of time. <br /> Enclosed is a check for the fee to review this TR submittal along <br /> with design calculations and a letter report by John Abel , P.E . , <br /> and an application review letter by a HBPE manufacturer . Please <br /> contact me if you have any questions or require any additional <br /> information. <br /> Sincerely, <br /> Larry Perino <br /> Superintendent-Technical Services <br /> cc: Patricia Nelson, CDH <br /> LP/cjm <br />