6-198
673.07 Method of Measurement Wet Cast Small Landscape Block W all will be
measured by the square foot of fr ont surface not to exceed the dimensions shown on the Contract Plans unless authori zed by the Resident. Vertical and horizontal dimensions will be from the edges of the blocks. No field measurements for com putations will be made unless the Resident specifies, in writing, a change in the limi ts indicated on the Plans.
673.08 Basis of Payment The accepted quantity of Wet Cast Sma ll Landscape Block
Wall will be paid for at the contract unit price per square foo t complete in place. Payment shall be full compensation for furnishing geotechnical design a s required, all labor, equipment and materials including all precast concrete units, a ggregate fill, hardware, joint fillers, geosynthetic, drainage pipe, and technical field repre sentative. Excavation, foundation material and backfill material will all be incidenta l to the Wet Cast Small Landscape Block Wall. Cost of cast-in-place concrete for leveling pad will not be pa id for separately, but will be considered incidental to the Wet Cast Small Landscape B lock Wall. There will be no allowance for excavating and backfilling for the Wet Cast Small Landscape Block Wall beyond the limits shown on the approved su bmitted plans, except for excavation required to remove unsuitable subsoil in preparation for the foundation. Payment for excavating unsuitable subsoil shall be full compens ation for all costs of pumping, drainage, sheeting, bracing and incidentals for proper execution of the work, and will be paid as common excavation in accordance with Section 20 3. Payment will be made under: P a y I t e m P a y U n i t
673.10 Wet Cast Small Landscape Block Wall S q u a r e F o o t
SECTION 674 - PREFABRICATED CONCRETE MODULAR GRAVITY WALL
674.01 Description This work shall consist of designing, fabric ating, furnishing, and
constructing a prefabricated modular reinforced concrete gravit y wall in accordance with these specifications and in reasonably close conformance with t he lines and grades shown on the Plans, or established by the Resident. Included in the scope of the Pre fabricated Concrete Modular Gr avity Wall construction are: all grading necessary for wall construction, excavation, compaction of the wall foundation, backfill, construction of leveling pads, place ment of geotextile, segmental unit erection, and all incidentals necessity to complete the wo rk. 6-199 The Prefabricated Concrete Modular Gravity Wall design shall f ollow the general dimensions of the wall envel ope shown in the contract plans. T he top of the leveling pad shall be located at or below the theoretical leveling pad eleva tion. The minimum wall embedment shall be at or below the elevation shown on the plans . The top of the face panels shall be at or above the top of the panel elevation show n on the plans. The Contractor shall require the design-supplier to supply an on-site, qualified experienced technical representative to advise the Contractor c oncerning proper installation procedures. The technical representative shall be on-site duri ng initial stages of installation and thereafter shall remain available for consultation as neces sary for the Contractor or as required by the Resident. The work done by this representative is incidental.
674.02 Materials Materials shall meet the requirements of the following subsections of
Division 700 — Materials:
G r a v e l B o r r o w 703.20 Preformed Expansion Joint Material 705.01 Reinforcing Steel 709.01 Structural Pre-cast Concrete Units 712.061 Drainage Geotextile 722.02 The Contractor is cautioned that all of the materials listed ar e not required for every Prefabricated Concrete Modular Gravity Wall. The Contractor sh all furnish the Resident a Certificate of Compliance certif ying that the applicable materi als comply with this section of the specifications. Modify requirements in 712.061 as follows: Concrete Units: Concrete shall be Class P. The concrete shall contain a minimu m of 5.5 gallons per cubic yard of calcium nitrite solution. The minimum permeability of the concrete as indicated by Surfac e Resistivity shall be 17 KOhm-cm. Defects Defects which may cause rejection of precast units in clude, but are not limited to, the following: Any discontinuity (crack, rock pocke t, etc.) of the concrete wh ich could allow moisture to reach the reinforcing steel. Rock pockets or honeycomb over 6 square inches in area or over 1 inch deep. Edge or corner breakage exceeding 12 inches in length or 1 inch in depth. Any other defect that clearly and substantially impacts the qua lity, durability, or maintainability of the structure, as determined by the Fabricat ion Engineer. Repair honeycombing, ragged or irregular edges and other non-st ructural or cosmetic defects using a patching material from the Department Qualified Products List (QPL). The repair, including preparation of the repair area, mixing and ap plication and curing of the patching material, shall be in accordance with the manufacturer 's product data sheet.