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§ 5-126 SAN MARCOS CODE § 5-126 thoroughly tamped by approved methods before commencing em- bankment construction. The surface of the ground, including plowed loosened ground or surface roughened by small washes or other- wise shall be restored by blading or other methods, and, where indicated on plans or required by the engineer, the ground sur- face thus prepared shall be compacted by sprinkling and roIling. Where indicated on plans or directed by the engineer, the surface of hillsides to receive embankment shall be loosened by scarifying or plowing to a depth of not less than four (4) inches, or cut into steps before embankment materials are placed. The em. bankment shall then be placed in layers, as hereinafter specified, beginning at the low side in part width layers and increasing the widths as the embankment is raised. The material which has been loosened shall be recompacted simultaneously with the em. bankment material placed at the same elevation. Except as otherwise required by the plans, all parking lots shall be constructed in layers approximately parallel to the fin- ished grade of the roadbed and unless otherwise specified each layer shall be so constructed as to provide a uniform slope of one-fourth (*) inch per foot. (c) Earth fill. Earth fùl shall be defined as that composed prin- cipally of material other than rock, and shall be constituted of accepted material from approved sources. Except as otherwise specified, earth embankment filling shall be constructed in successive layers for the full width of the indi- vidual parking lot cross-section and in such lengths as are best suited to the sprinkling and compaction methods utilized. Layers of embankment may be formed by utilizing equipment which will spread the material as it is dumped, or they may be formed by being spread by blading or other acceptable methods from piles or windrows dumped from excavating or hauling equip- ment in such amounts that materials is evenly distributed. Each layer or earth fiU shall be uniform as to material, density and moisture content before beginning compaction. Where layers of unlike materials abut each other, each layer shall be featheredged for at least one hundred (100) feet or the material shall be so mixed as to prevent abrupt changes in the soil. No material places in the embankment by dumping in a pile or windrow shall Supp. No. 22 250.20