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optimum moisture and neither dry or saturated, and tamp to the extent directed by the Engineer. The Department may require that the backfilling be done with poured concrete . Install spread footings which support sign structures overhanging the roadway as required in 455 -25 through 455 - 37 . 7004 . 1 .2 Mixing and Placing Concrete : For batching and mixing of concrete for footings , meet the requirements of Section 346 , except that the Engineer will allow hand mixing by approved methods where the quantity to be mixed does not exceed 1 /2 yd3 . Use cast- in-place or precast concrete for the footings . Obtain precast concrete footings from a plant that is currently on the list of Producers with Accepted Quality Control Programs . Producers seeking inclusion on the list shall meet the requirements of 105 - 3 . 700-7. 1 .3 Forms : The Engineer will not require forms when the ground is sufficiently firm, in which case, sufficiently moisten the adjacent earth to prevent it from absorbing the moisture from the concrete . Where forms are required and the soil is not moist, place sufficient water, as directed by the Engineer, in the hole , and pour the concrete as soon as the water has been absorbed. Place at least 4 inches of loose earth, free from clods or gravel, over the top of the footing to effect curing. 7004. 1 .4 Finishing Concrete : Trowel the top of the concrete to a smooth finish . 7004 . 2 Drilled Shafts : Meet the requirements of Section 455 . 700-8 Erection of Signs and Sign Supports . Do not erect overhead sign supports until the concrete strength in the support footing is at least 2 , 500 psi . Determine concrete strength from tests on a minimum of two test cylinders sampled and tested in accordance with ASTM C 31 and ASTM C 39 and verifying test results have been provided to the Engineer. Erect the signs and sip structures in accordance with the details shown in the plans . The Contractor may fabricate the structural steel sign trusses in sections that will fit into available galvanizing vats . Prior to galvanizing, weld the joints as specified in 460 -6 and in accordance with the details shown in the plans . Re- galvanize damaged parts as specified in Section 562 . Weld aluminum structures in accordance with 965 -3 . Attach electronic display signs to the supporting structure in accordance with the manufacturer ' s recommendations using the mounting hardware provided by the manufacturer. 700.9 Removal or Relocation of Signs . Relocation of signs shall consist of removing the existing sign assembly and installing the sign on a new foundation . When the plans call for existing ground-mounted signs to be relocated or removed, immediately remove supports and footings that project more than 6 inches above the ground surface after removing the sign panel from the assembly. Remove existing footings to a depth at least 12 inches below the ground surface . The costs will be included in the Contract unit price of the item to which it is incidental . Notify the Engineer a minimum of 30 days prior to removal of existing Logo sign structures . 70040 Overlay Existing Sign Panels . Use 0 . 040 inch thick aluminum sheeting for overlays larger than 3 square feet placed on a sign panel . Replace hex head bolts on the sign surface using stainless steel flat head machine screws with nuts and lock washers to give a flat surface for the overlay panel . Install the overlay - 189 - FPID ( S ) : 423186 - 1 - 58 -01