7-14 Type B material shall conform to the following table: Sieve Designation Percentage by Weight Passing Square Mesh Sieves 1 inch 95-100 ½ inch 75-100 No. 4 50-100 No. 20 15-80 No. 50 0-15 No. 200 0-5.0 Type C material shall conform to the following table: Sieve Designation Percentage by Weight Passing Square Mesh Sieves 1 inch 100 ¾ inch 90-100 ⅜ inch 0-75 No. 4 0-25 No. 10 0-5
703.24 Stone for French Drains Stones for French drains shall consist of hard,
durable rock and shall conform to the following table: Sieve Designation Percentage by Weight Passing Square Mesh Sieves 6 inch 90-100 1½ inch 0-40 No. 4 0-5
703.25 Stone Fill Stones for stone fill shall consist of hard , sound, durable rock that
will not disintegrate by exposure to water or weather. Stone f or stone fill shall be angular and rough. Rounded, subrounded, or long thin stones will not b e allowed. Stone for stone fill may be obtained from quarries or by screening oversized ro ck from earth borrow pits. The maximum allowable length to thickness ratio will be 3:1. T he minimum stone size (10 lbs) shall have an average dimension of 5 inches. The maximum stone size (500 lbs) shall have a maximum dimension of approximately 36 inches. Larger st ones may be used if approved by the Resident. Fifty percent of the stones by volum e shall have an average dimension greater than 12 inches (200 lbs). 7-15
703.26 Plain and Hand Laid Riprap Stone for riprap shall cons ist of hard, sound
durable rock that will not disintegrate by exposure to water or weather. Stone for riprap shall be angular and rough. Rounded, subrounded or long thin s tones will not be allowed. The maximum allowable length to width ratio will be 3:1. Stone for riprap may be obtained from quarries or by screening oversized rock from earth borrow pits. The minimum stone size (10 lbs) shall have an average dimension of 5 inches. The maximum stone size (200 lbs) shall have an average dimension of approximately 12 inches . Larger stones may be used if approved by the Resident . Fifty percent of the stones by volume shall have an average dimension greater than 9 inches (50 lbs).
703.27 Stone Blanket Stones for stone blanket shall consist o f sound durable rock that
will not disintegrate by exposure to water or weather. Stone f or stone blanket shall be angular and rough. Rounded or subrounded stones will not be al lowed. Stones may be obtained from quarries or by screening oversized rock from eart h borrow pits. The minimum stone size (300 lbs) shall have minimum dimension of 14 inches, and the maximum stone size (3000 lbs) shall have a maximum dimension of approximately 66 inches. Fifty percent of the stones by volume shall have aver age dimension greater than 24 inches (1000 lbs).
703.28 Heavy Riprap Stone for heavy riprap shall consist of h ard, sound, durable rock
that will not disintegrate by expos ure to water or weather. St one for heavy riprap shall be angular and rough. Rounded, subrounded, or thin, flat stones w ill not be allowed. The maximum allowable length to width ratio will be 3:1. Stone for heavy riprap may be obtained from quarries or by screening oversized rock from eart h borrow pits. The minimum stone size (500 lbs) shall have minimum dimension of 15 inches, and at least fifty percent of the stones by volume shall have an average dimension greater than 24 inches (1000 lbs)
703.29 Stone Ditch Protection Rock used for ditch protection shall consist of sound,
durable rock that will not disintegrate by exposure to water or weather. Fieldstone, rough quarry stone, blasted ledge rock or tailings may be used. The rock shall be graded within the following limits or as otherwise approved Sieve Designation Percentage by Weight Passing Square Mesh Sieves 12 inch 90-100 4 inch 0-15 The size of any stone shall not exceed 18 inches when measured along its longest axis.
703.31 Crushed Stone 2-Inch Crushed stone shall be obtained fr om rock of uniform
quality and shall consist of clean, angular fragments of quarri ed rock, free from soft disintegrated pieces or other objectionable matter. 7-16 The stone, which shall be similar to railroad ballast, shall m eet the following gradation requirements: Sieve Designation Percentage by Weight Passing Square Mesh Sieves 2½ inch 100 2 inch 95-100 1 inch 0-30 ¾ inch 0-5
703.32 Definitions (ASTM D 2488, Table 1).
Angular: Particles have sharp edges and relatively plane side s with unpolished surfaces Subrounded: Particles have nearly plane sides but have well-ro unded corners and edges Rounded: Particles have smoothly curved sides and no edges
703.33 Stone Ballast Aggregate for stone ballast shall b e clean and graded crushed
stone aggregate with a hard, dense angular particle structure p roviding sharp corners and cubicle fragments with prime c onsideration for drainage efficie ncy. The material retained on the ⅜ inch sieve shall contain n ot more than 5 percent, by weight of flat and elongated particles when performed in accord ance with test method ASTM D 4791, Flat Particles, Elongated Particles, or Flat and E longated Particles in Coarse Aggregate, using a dimensional ratio of 1:5. The material shall have an absorption no greater than 1.5 percent by weight and a bulk specific gravity of 2.60 or greater as determined in accor dance with AASHTO T 85 modified for weight of sample. The material shall not exceed 30 percent loss on ASTM C53 5, Resistance to Degradation of Large-Size Coar se Aggregate by Abrasion and Impa ct in the Los Angeles Machine. The material shall meet the grading requirements of the f ollowing table: Sieve Designation Percentage by Weight Passing Square Mesh Sieves Type 4 Type 4A 2 ½ inch 100 2 inch 100 90-100 1 ½ inch 90-100 60-90