604.01 Description.
Department upon completion of the project. When required on the plans, this item shall also be full compensation for removal and delivery of the field office and appurtenances (including security fence) to a plan designated location. No additional compensation will be allowed for furnishing field office units larger than the type specified in the contract. Partial payments for the field offices will be made on monthly estimates in accordance with the following schedule:
a.75% of the unit price bid upon satisfactory installation and acceptance of the facility.
b.15% of the unit price bid when 1/2 of the anticipated construction time has expired.
c.10% of the unit price bid when the semi -final or final estimate is paid.
4.Item No. 603-D. The ordered and accepted State Furnished Field Office, measured as noted above, will be paid for at the contract unit price bid for the relocation of the Field Office specified, w hich shall be full compensation for the breakdown, moving, and installation of the Office, its furnishings, related facilities, and appurtenances (including existing security fence when shown on the plans). When required on the plans, this item shall also be full compensation for removal and delivery of the field office and appurtenances (including relocated security fence) to a plan designated location.
b.Payment will be made under Item No .: 603-A Furnishing Type ___ Field Office - per each 603-B Furni shing Security Fence - per linear foot {meter} 603-C Furnishing Type ___ Field Office (State Retained) - per each 603-D State Furnished Field Office - per each GEOTEXTILES IN PERMEABLE ASPHALT TREATED BASE APPLICATION
604.01 Description.
This Section shall cover the furnishing and placing of geotextiles for use as a means to prevent clogging of the permeable base layer due to the migration of fine material from the underly ing roadway layer. The geotextile shall be designed to allow passage of water while retaining untreated base or subbase course soils without clogging.
604.02 Materials.
The geotextile used in this work shall be one constructed of non -woven synthetic fibers meeting the requirements of AASHTO M 288 for Separation Geotextile Class 3 and Section 810 of these specifications with the exception that geotextiles manufactured with polyamide will not be allowed. The geotextile filter shall be resistant to the heat an d temperature range expected during placement of the Permeable Asphalt Treated Base. The geotextile shall be selected from List II -3, of the Department's manual titled "Materials, Sources, and Devices With Special Acceptance Requirements". Information conc erning this list is given in Subarticle 106.01(f) and ALDOT -355.
604.03 Construction Requirements.
a.General . The surface area on which the geotextile fabric is to be placed shall be free of loose aggregate, foreign debris, and all sharp objects during placement of the fabric.
b.Installation . The geotextile filter shall be installed immediately prior to placement of the permeable asphalt treated base layer and extended full width between the inside and outside edge drains according to the manufacturer's specifications and as shown on the plans or in the proposal. Exposure of geotextile filter to the elements between lay down and cover shall not exceed three days. Adjacent geotextile rolls, seamed or unseamed, shall be overlapped in the direction of placement of the Permeable Asphalt Treated Base a minimum of 2 feet {600 mm} at all longitudinal and transverse filter fabric joints.
605.02 Materials.
The geotextile shall be held in place prior to Permeable Asphalt Treated Base placement by pins, staples, or other means as app roved by the Engineer.
c.Seams . Both factory and field sewn or sealed seams, if applicable, shall conform to the strength requirements of Table 1 as outlined in AASHTO M 288 for separation applications. All seams shall be subject to the approval of the E ngineer.
d.Damage Repair . Damaged geotextiles, as identified by the Engineer, shall be repaired immediately. Any geotextile filter which is ripped or torn during the construction process shall be replaced or repaired with a patch which extends 3 feet {1 m} beyond the perimeter of the tear or damage.
604.04 Method of Measurement.
The geotextile will be measured by the square yard {square meter} computed from the width (from pavement edge drain to pavement edge drain) and the length as shown on the plans , or established in writing by the Engineer. This excludes seam overlaps.
604.05 Basis of Payment.
a.General . The accepted quantities of geotextiles will be paid for at the contract unit price per square yard {square meter} in place.
b.Payment will be made under Item No .: 604-A Separative Geotextile - per square yard {square meter} SECTION 605 PAVEMENT AND SPECIAL UNDERDRAIN
605.01 Description.
This Section shall cover the work of constructing pavement and special underdrain. Pavement underdrain shall be drain lines in the median and at the edges of pavement, and shall include collection pipes, and outlets. Edge drains and median drains shall be aggregate filled underdrains. The details of the special underd rain will be shown on the plans. Shoulder drainage plane layers shall be constructed in accordance with the requirements given in Section 315. Geotextile filter fabric shall be placed to reduce the movement of soil into the drains. Pipes shall be installed to collect and provide outlets for the drainage.
605.02 Materials.
a.Geotextile Filter . The geotextile filter for aggregate filled underdrain shall be a non -woven material meeting the requirements of AASHTO M 288 for C lass 2 Subsurface Drainage Geotextile and Section 810 of these specifications. The geotextile shall be selected from List II -3, of the Department's manual titled "Materials, Sources, and Devices With Special Acceptance Requirements". Information concerning this list is given in Subarticle 106.01(f) and ALDOT -355.
b.Pipe. The required types and sizes of pipes will be shown on the plans. The pipe may be of any of the non -corrugated pipe underdrain or smooth lined corrugated pipe underdrain noted in Section 852, perforated or non -perforated as required. Pipe fittings shall be of the same material as the pipe or of a compatible material providing a crush strength equal to, or greater than, that of the type pipe being used.
c.Aggregate Filler . Aggregate filler shall meet the requirements for Coarse Aggregate, Section 801, for ALDOT size #4, #5, or #57 and the additional requirement that no more that 1% of the aggregate passes the No. 200 {75 µm} sieve.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 477–477 of 934.