Base Rock    

Dutra’s rock quarry supplies aggregate and building materials to complete a variety of projects, from improving a sports field or business parking lot, to larger projects like shoreline restoration or highway repair.

Dutra Materials’ water-side barge-loading equipment makes it the most cost-effective transporter of quality aggregate in the region.

From levee repair projects along the Sacramento Delta, to sporting fields and playgrounds for Bay Area schools, our clients range from civil contractors to small water districts and individual home owners.


Cl II AB (San Rafael Only)

Meets all specifications of Section 26 of the 2006 CA Department of Transportation Standard Specifications. As required by Section 26-1.02A, the material shall be free from organic matter and other deleterious substances. This material is 100% crushed virgin rock and contains no recycled material.

Sieve Size Percent Passing Specification
1" (25mm) 100 100
3/4" (19mm) 100 90-100
No. 4 (4.75mm) 50 35-60
No. 30 (600um) 24 10-30
No. 200 (75um) 8 2-9
Sand Equivalent (CTM 217) 29 22 minimum
Durability (CTM 229) 42 35 minimum
R-Value (CTM 301) 83 78 minimum

Cl II AB Rec (Richmond Only)

Meets all specifications of Section 26 of the 2006 CA Department of Transportation Standard Specifications. As required by Section 26-1.02A, the material shall be free from organic matter and other deleterious substances. Aggregates are 100% recycled materials.

Sieve Size Percent Passing Specification
1" (25mm) 100 100
3/4" (19mm) 95 90-100
No. 4 (4.75mm) 52 35-60
No. 30 (600um) 19 10-30
No. 200 (75um) 5.4 2-9
Sand Equivalent (CTM 217) 59 25 minimum
Durability (CTM 229) 51 35 minimum
R-Value (CTM 301) 86 78 minimum

NOTE: All third-party sampling of aggregate for the purpose of specification compliance shall be performed in accordance with California Test Method 125. Testing of these materials for compliance purposes shall be done in accordance with applicable California Department of Transportation test methods and practices.