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<br /> <br />BUSCH, HUTCHISON & ASSOCIATES, INC. CONSULTINO[NO~N[[Rs <br />1107 PL[[TWOOD ORIV[ - SAYTOWN, T[XA! 770!0 - -NON[ (7f~) 422-~21~ <br />• <br />June 30, 1976 <br />Honorable Mayor and City Commission <br />City of La Porte <br />P. 0. Box 1115 <br />La Porte, Texas 77571 <br />SUBDIVISION ORDINANCE REVISIONS <br />Gentlemen, I recommend that the subdivision ordinance be amended to <br />permit the following: <br />1. Permit the use of poly (vinyl chloride) (PVC) pipe conforming <br />to the American Society of Testing Materials (A.S.T.M.) <br />Specification D-2241, Standard Dimension Ratio (S.D.R.) 26; <br />• 2. When a formless paving machine is used to lay concrete and <br />the water-cement ratio in the mix is 6.25 gallons per sack <br />of cement or less., allow the use of concrete containing <br />4-1/2 sacks of cement per cubic yard. <br />PVC pipe has been in satisfactory underground pressure service for a <br />number of years. When properly installed underground it is an <br />excellent material. <br />The strength of concrete varies inversely with the water-cement ratio. <br />That is the less water used, the stronger the concrete. When formless. <br />paving machines are used it is necessary to lay a very dry mix so that <br />the pavement will "stand" without form until the concrete "sets". Even <br />when the quantity of cement is reduced to 4-1/2 sacks per cubic yard, <br />concrete so laid has strength characteristics superior to concrete con- <br />taining 5 sacks of cement per cubic yard .laid in a conventional manner. <br />~D~~ ,~~~ <br />~./~: Busch Jr. , P.E. <br />~, <br />AJB/sh <br />