2780 Memorandum, James Lawrence Carney and Town of Lexington, supplementary conditions, September 19, 1902

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'The sub-grade of these driveways is to be eight inches below the finished grade and the road bed is to be worked to an even surface parallel Lo the finished surface . The finished surface will be rounded or crow-tied four inches . After the sub-grade has been formed, the road bld is to be thoroughly rolled with a .heavy horse ring-roller, or, if the highway superintendent so allows ,the ,.own n tetra roller, before any ' 4y material is placed upon it , and all soft places are to be dug out and the spaces refilled with suitable material to line of sub-grade and the surfaces again rolled until they become hard and compact . Upon this s tib-grade place a layer of crushed field stone, five inches deep . No stone in this layer is to exceed three inches in any dimensions . Care is to be taker, to preserve the crown and this foundation la;;er is to be yell compacted by rolling with a heavy roller, and is to be kept In good condition until the pavement is put upon it . A middle layer, of crashed field stone , is to be placed evenly over the foundation layer, no stone in this Layer is to exceed two inches in any dimensions . care is to be taken to preserve the cravat and the whole is to be watered and thorouglil.y rolled again with a heavy ring-roller until the layer is hard and compact , and the surface one inch below the f'iniLihed grade of drive . Upon this middle layer after it is thoroughly con- solidated there is to be spread a finishing layer, at least one inch deep after compacting, of fine crushed field stone aCreeazings, composed of stones averagixag one half inch in —11i.s layer is to be watered, raked and rolled until thoroughly compacted and hard, and formed to a smooth even surface, and when finished to have a perfect crown of four inches .