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DRAINAGE MATERIAL <br />Alternative 1 <br />Class 2 Permeable Material <br />(Caltrans Standard Specs. latest edition) <br />Material shall consist of clean . coarse sand and <br />gravel or crushed stone. conforming to the <br />following gradation requirements : <br />Alternative 2 <br />Sieve Size <br />1" <br />3/4" <br />3/8" <br />#4 <br />#8 <br />#30 <br />#50 <br />#200 <br />% Passing Sieve <br />100 <br />90-100 <br />40-100 <br />25-40 <br />18-33 <br />5-15 <br />0-7 <br />0-3 <br />½-to 3/4-inch Clean Crushed Rock or <br />Gravel Wrapped in Filter Fabric <br />All non-woven filter fabric shall meet the following <br />minimum average roll values unless otherwise specified <br />by Cornerstone Earth Group <br />Grab Strength (ASTM D-4632): <br />Mass Per Unit Area (ASTM D-4751): <br />Apparent Opening Size (ASTM D-4751 ): <br />Flow Rate (ASTM D-4491 ): <br />Puncture Strength (ASTM D-4833): <br />Notes: <br />180 lbs. <br />5 oz/yd <br />70-100 U .S. std . sieve <br />80 gal/min/ft <br />80 lbs . <br />1. 1 % fall (minimum) along all keyways. benches and subdrain lines . <br />2. All perforated pipe placed perforations down. <br />3 . All pipe joints shall be glued . <br />Drainage material <br />Base of keyway or J <br />bench sloped at least <br />2% toward hillside <br />4 . All subdrains should be discharged to a free draining outlet approved by the Civil Engineer. <br />5 . Subdrain pipe (perforated or solid connector) should consist of SDR-35 PVC pipe when <br />placed in fills less than 30 feet deep. SDR-23.5 PVC pipe should be used when fill is greater <br />than 30 feet deep. <br />I 2-6" <br />i-24"min.- <br />36"min. <br />6" perforated pipe . such as . SDR35 <br />or approved equivalent (see Note 5) <br />Not to scale <br />Typical Keyway and Bench Subdrain Detail Project Number <br />132-8-2 CORNERSTONE <br />EARTH GROUP <br />Lester-Shriner Parcels <br />Pleasanton, CA <br />Figure Number <br />Figure 7 <br />Date Drawn By <br />October 2014 RRN