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No. 4 0 to 60 <br />No. 40 0 to 50 <br />No. 200 0 to 5 <br />E. Backfill: Soil free of organics and debris and consisting of either GP, GW, SP, SW, or SM type, <br />classified in accordance with ASTM D2487 and the USCS classification system. <br />1. Soils classified as SC and CL are considered suitable soils for segmental retaining walls with a total <br />height of less than 15 feet unless the Plasticity Index (PI) is 20 or more. <br />2. Maximum particle size for backfill is 2 inches. <br />3. Unsuitable soils are organic soils and those soils classified as CH, OH, MH, OL, or PT. <br />F. Impervious Material: Clayey soil or other similar material which will prevent percolation into the <br />drainage zone behind the wall. <br />G. Drainage Pipe: Perforated or slotted PVC or corrugated HDPE pipe manufactured in accordance with <br />D3034 and/or ASTM F405. The pipe may be covered with a geotextile filter fabric to function as a filter. <br />H. Construction Adhesive: Exterior grade adhesive as recommended by the retaining wall unit manufacturer. <br />PART 3 - EXECUTION <br />3.01 EXAMINATION <br />Note to Specifier: In Paragraph below, select appropriate entity <br />A. Examine the areas and conditions under which the retaining wall system is to be erected, and notify the <br />[Architect] [Engineer] [Owner] [Contractor] in writing of conditions detrimental to the proper and timely <br />completion of the work Do not proceed with the work until unsatisfactory conditions have been <br />corrected. <br />B. Promptly notify the wall design engineer of site conditions which may affect wall performance, soil <br />conditions observed other than those assumed, or other conditions that may require a reevaluation of the <br />wall design. <br />C. Verify the location of existing structures and utilities prior to excavation. <br />3.02 PREPARATION <br />A. Ensure surrounding structures are protected from the effects of wall excavation. <br />B. Excavation support, if required, is the responsibility of the Contractor, including the stability of the <br />excavation and its influence on adjacent properties and structures. <br />3.03 EXCAVATION <br />Note to Species In Paragraph below, select appropriate entity <br />A. Excavate to the lines and grades shown on the Drawings. Over -excavation not approved by the <br />[Architect] [Engineer] [Owner (or Owner's representative)] will not be paid for by the Owner. <br />Replacement of these soils with compacted fill and/or wall system components will be required at the <br />Contractor's expense. Use care in excavating to prevent disturbance of the base beyond the lines shown. <br />3.04 FOUNDATION PREPARATION <br />A. Excavate foundation soil as required for footing or base dimension shown on the Drawings, or as directed <br />by the Project geotechnical engineer. <br />B. The Project geotechnical engineer will examine foundation soil to ensure that the actual foundation soil <br />strength meets or exceeds that indicated on the Drawings. Remove soil not meeting the required strength. <br />Oversize resulting space sufficiently from the front of the block to the back of the reinforcement, and <br />backfill with suitable compacted backfill soils. <br />C. The Project geotechnical engineer will determine if the foundation soils will require special treatment or <br />correction to control total and differential settlement. <br />D. Fill over -excavated areas with suitable compacted backfill, as recommended by the Project geotechnical <br />engineer. <br />4-32 32 23 <br />