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 Uvalde
 Code of Ordinances
 Title 16. SUBDIVISIONS
 Chapter 16.24. DESIGN STANDARDS
 Article IV. Alleys

  § 16.24.250. Width.  

Latest version.

  • If alleys are constructed, the city requires the right-of-way width to be a minimum of 25 feet.

    The minimum pavement section for alleys shall consist of one and one-half inches of hot mix asphaltic concrete material (HMAC) or cold mix asphaltic concrete material CMAC) over six inches of flexible base material over compacted subgrade or fill material. An asphalt prime coat shall be placed over the base material prior to HMAC/CMAC installation. The minimum base material width shall be 24 feet and the minimum asphalt material width shall be 20 feet.

    Pavement Subgrade: Subgrade areas shall be scarified to a depth of six inches and moisture conditioned between optimum and plus four (+4) percentage points of the optimum moisture content. The moisture conditioned subgrade shall then be compacted to at least 95 percent of maximum dry density determined in accordance with TxDOT Tex-114-E or ASTM D698. The subgrade should be moisture conditioned just prior to fill or base placement so the subgrade maintains its compaction moisture levels and does not dry out. Density and moisture testing shall be performed at least once every 2,500 square feet of subgrade, but no fewer than three tests.

    Pavement Flexible Base Course: Flexible base material shall be composed of crushed limestone base meeting all the requirements of 2004 TxDOT Standard Specifications, Item 247, type A, Grade 1 or 2 including triaxial strength. The base shall be compacted to at least 95 percent of the maximum dry density as determined by the modified moisture-density relationship TxDOT Tex-113-E or ASTM D1557 at moisture contents ranging between minus two (-2) and plus three (+3) percentage points of the optimum moisture content. Density and moisture testing shall be performed at least once every 2,500 square feet of base material, but no fewer than three tests.

    Prime Coat: All flexible base materials shall be sealed with an asphalt material (prime coat) prior to paving. All asphalts and emulsions used for prime coat shall conform to the requirements of Item 300, "Asphalts, Oils and Emulsions" of the 2004 TxDOT Standard Specifications. The asphaltic material for Prime Coat shall meet the requirements for Cut-Back-Asphalt, "MC-30" or "MC-250", Emulsified Asphalts, "AE-P", "SS-1", "MS-2", "CSS-1", or other asphalts or emulsions as approved by the city/engineer.

    Hot Mix Asphaltic Concrete Surface Course: The asphaltic concrete surface course shall be plant mixed, hot laid Type D (fine graded surface course) meeting the specification requirements of 2004 TxDOT Standard Specifications Item 340. The mix shall be designed for a stability of at least 40 and shall be compacted between 91 and 95 percent of the maximum theoretical density as measured by Tex-227-F. The asphalt cement content by percent of total mixture weight should fall within a tolerance of ±0.3 percent asphalt cement from the specific mix. In addition, the mix should be designed so 75 to 85 percent of the voids in the mineral aggregate (vma) are filled with asphalt cement. The mix shall have at least 70 percent strength retention when tested in accordance with Tex-531-C. Density testing shall be performed at least once every 2,500 square feet of asphalt material, but no fewer than three tests.

    Cold Mix Asphaltic Concrete Surface Course: The cold mix asphaltic concrete surface course shall be plant mixed, cold laid Type D (fine graded surface course) meeting the specification requirements of 2004 TxDOT Standard Specifications, Item 334 or Item 330. The mix shall be designed for a Hveem stability of at least 35 and a target laboratory-molded density of 92.5 percent plus or minus 1.5 percent. Field compaction shall be determined in accordance with procedures outlined in Tex-207-F. Density testing shall be performed at least once every 2,500 square feet of asphalt material, but no fewer than three tests.

    The owner/contractor shall provide results of compaction testing from a certified materials testing laboratory. Material proctors of the subgrade and base materials must be obtained prior to initiation of compaction activities. The mix design of the asphaltic material must be submitted to the city for review and approval prior to application.

    Materials that do not meet the required standards must be removed and replaced to standard at the expense of the owner/contractor.

    QUALIFICATION OF LABORATORY

    A.

    Meet "Recommended Requirements for Independent Laboratory Qualifications", published by American Council of Independent Laboratories.

    B.

    Meet basic requirements of ASTM E329, "Standards of Recommended Practice for Inspection and Testing Agencies for Concrete and Steel as Used in Construction" and ASTM E548.

(Ord. No. 2013-20, § 2, 10-22-2013; prior code § 23-77)