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Project No. 9929.G Geotechnical Investigation/Vineyard Avenue, Pleasanton 8 August 2003 <br />GUIDE SPECIFICATIONS FOR ROCK UNDER FLOOR SLABS <br />Definition <br />Graded gravel or crushed rock for use under slabs-on-grade shall consist of a minimum thickness <br />of mineral aggregate placed in accordance with these specifications and in conformance with the <br />dimensions shown on the plans. The minimum thickness is specified in the accompanying <br />report. <br />Material <br />The mineral aggregate shall consist of broken stone, crushed or uncrushed gravel, quarry waste, <br />or a combination thereof. The aggregate shall be free from deleterious substances. It shall be of <br />such quality that the absorption of water in a saturated dry condition does not exceed 3% of the <br />oven dry weight of the sample. <br />Gradation <br />The mineral aggregate shall be of such size that the percentage composition by dry weight, as <br />determined by laboratory sieves (iJ.S. Sieves) will conform to the following gradation: <br />'Sieve Size - ' x > , ' ~ Percentage Passing:' <br />3/4" 90-100 <br />No. 4 25-40 <br />No. 8 18-33 <br />No. 200 0-3 <br />Placing <br />Subgrade, upon which gravel or crushed rock is to be placed, shall be prepared as outlined in the <br />accompanying soil report. <br />TERRASEARCH, inc. Page 53 of 53 <br />