Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 722
s main-tenance and in June, 1920, it was con-sidered to be in good condition. The Pacific Electric Railway securesits supply of this type of pavementfrom asphalt contract plants. It ismixed at the plant under the railwaycompanys specifications and is pur-chased in terms of boxes, the approxi-mate… … Type of Base BITUJlINOrS BASEtat Composition. Bituminous base shall lie omposed of asphalt cement,broken stone and sand in the following proportions byweight: Per CentAsphalt cement ihi to 6 Stone and sand: Passing lO-mesh screen 20 to 30 Passing H-in. screen, retained on 10-mesh 6 to 20 Passing…
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