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CITY OF SANTA &NA, CALIFORNIA STANDARD SPECIFICATION NUMBER 11. Sand, Broken Stone and Gravel. Sand. SECTION 1. All sand shall be clean, hard, durable, uncoated stone particIes free from organic matter and lumps of clay. (a) CONCRETE SAND. Sand for all cement and concrete work shall contain, not more than three (3) per cent, by weight, of mica; not more than four (4) per cent, by weight. removable by the elutriatlon test; not more than six (6) per cent, by weight, shall pass a sieve having one hundred (100) meshes per linear inch; not less than ninety-five (95) per cent, b~ weight, shall pass a screen having four (4) meshes per linear inch; at least fifty (50) per cent, but not more than eighty-five (85) per cent, by weight, shall be retained on a sieve having thirty (30) meshes per linear inch. When the sand is mixed with Portland Cement in the proportion of one (1) part of cement to three (3) parts of sand, by weight, according to the standard methods of making 1:3 mortar briquettes, the resulting briquettes at the ages of both seven (7) and twenty- eight (28) days, when compared with briquettes mixed at the same time in the same pro- portions and consistently using the same cement, but with Standard Ottawa Testing Sand, shall show a tensile strength ratio of one hundred (100) per cent. Sand showing a tensile strength of less than one hundred (100) per cent, but not less than eighty-five (85) per cent, will be accepted for use subject to the use of additional cement. The additional prol~rtion of cement required shall be determined by laboratory tests and shall be the percentage required to increase the strength ratio to one hundred (100) per cent. In the absence of the above laboratory tests, and at the option of the Superiutendent of Streets only, a field test may be made a, follo~vs: Pill an ordinary glass fruit jar two-thirds (2-3) full of the sample of sand, then add sufficient water to thoroughly wash the sand by vigorous shaking; the shaking to be done for three (3) minutes, and by holding the jar in a vertical position, after which it shall be allowed to settle. The indicated sediment appearing on the top of the well defined minute grains of sand shall not measure more than ten (10) per cent of the total after settling for one (1) hour, nor more than five (5) per cent after settling for a period of twenty-four (24) hours. (b) BITUMINOUS PAVEMENT SAND. Sand for use in all bituminous pavement mixtures shall contain not more than two (2) per cent, by weight, of mica, shall all pass a sieve having ten (10) meshes per linear inch, and shall contain not more than four (4) per cent by weight, passing a sieve having two hundred (200) meshes per linear inch. (c) CUSHION SAND. Sand for cushion under concrete work on adobe and other swelling soils, shall contain not more than ten (10) per cent, by weight, of clay and silt and shall all pass a screen having one-half (¼) inch round openings. Broken Stone. SECTION 2, Broken stone shall be quarried rock, free from loam, clay and organic matter, and shall have a specific gravity of not less than two and sixty.five hundredths (2.65). It shall be uniform in quality, shall contain not more than five (5) per cent, by weight, of pieces