Nathan A. Burton

Senior Special Inspector

Mr. Burton has 18 years of experience performing concrete, masonry, soils, asphalt concrete, reinforcing steel and aggregate materials testing and inspection. He started as a Laboratory Technician performing various ASTM and Caltrans test methods before moving out into the field. His project experience includes roads/highways, schools, business parks, shopping centers, underground pipelines, residential developments, bridges, and airports. Mr. Burton is celebrating his 5th Anniversary with LACO this year.

Areas of Expertise

  • Construction Materials Testing
  • ASTM Testing
  • Caltrans Testing

Education

Santa Rosa Junior College, Santa Rosa, CA

Registrations and Certifications

  • ACI Field Testing Technician Grade 1 – License No. 00099291, Exp. 6/23/2017
  • Caltrans CTM 125 AC/AGG, 375, 518, 539, 556, 231, 504, 533, 540, 557
  • ICC Reinforced Concrete Special Inspector – License No. 5111161-49, Exp9/2/2019
  • ICC Structural Masonry Special Inspector – License No. 5111161-84, Exp. 9/2/2019
  • Nuclear Gauge Operator – License No. 36891

Professional Memberships

International Code Council – Member

Select Project Experience

Fort Bragg Coastal Trail Phase I – Fort Bragg, California.
Phase I included 4.5 miles of trail on 82 acres of the old Georgia-Pacific mill site, 30+ acres of industrial land restored to its former natural beauty, three restrooms, two parking lots, 14 interpretive signs, two welcome plazas. Mr. Burton provided the following services: observe compaction procedures and perform density tests at representative locations; collected sample of fill, backfill, and aggregate base materials for laboratory testing; observe reinforcing steel placement; performed field density testing; and check foundations.

Santa Rosa Junior College Petaluma Campus Expansion – Petaluma, California.
Project included a $50M expansion to the existing campus. Materials observation and testing services included batch plant inspection, foundation and slab-on-grade concrete and shop/field steel fabrication inspection. Special Inspection Services included: Batch plant inspection; Laboratory rebar tensile and bend testing; Special inspection during placement of concrete; Compressive strength testing of concrete; Shop and field welding inspections; Load-testing of post-installation of epoxy anchor.

Ukiah Valley Medical Center – Ukiah, California.
LACO’s Ukiah office and laboratory provided special inspection and materials testing services as requested by the Owner or designated others. Mr. Crump provided special inspection services in accordance with project documents and ACI, AWS and ASTM standards. LACO’s certified welding inspectors verified and documented compliance of structural steel elements at the fabricator’s facility prior to delivery to the project site. During shop and field welding procedures, Mr. Crump verified welder qualifications, observes procedures, and performed non-destructive verification testing for comparison with project specifications. Concrete batch plant inspections were performed for each day’s pour. Mr. Crump observed batching procedures for the first truck to check that materials and proportions are in accordance with approved mix designs. During placement of concrete, Mr. Crump observed procedures, performed slump and temperature tests, and prepared specimens for curing and laboratory compressive strength testing. Similarly, he prepared samples of high-strength grout placed under column base plates for laboratory compressive strength testing. Floor flatness testing was performed within 72 hours of casting the building expansion slabs, and submitted to the project Contractor and Architect, as required by the project specifications.

Casa Grande High School Special ED Modular Building – Petaluma, California.
LACO provided special inspection and materials testing services for a recently installed modular building at Casa Grande High School. The stage addition included reinforced concrete foundations with slab-on-grade and a welded steel moment frame. The modular units were supported on steel reinforced concrete foundations with concrete porches. We provided the following services: Batch plant inspection; Laboratory rebar tensile and bend testing; Special inspection during placement of concrete; Compressive strength testing of concrete; Torque testing of post-installed anchors.

Marin County Office of Education Community School Relocation – Marin, California.
LACO provided special inspection and materials testing services for the Marin County Office of Education Community School Relocation project located in San Rafael, California. The project consisted of the construction of four new buildings, a shade structure, retaining walls, and concrete walkways. The buildings varied in plan footprint between 960 and 2,560 square feet and were constructed on steel-reinforced concrete foundations with slabs-on-grade and welded steel column-and-beam framing. We provided the following services: Batch plant inspection; Laboratory rebar tensile and bend testing; Special inspection during placement of concrete; Compressive strength testing of concrete; Shop and field welding inspections; High strength bolt torque-testing; Load testing post-installation of epoxy anchors.

Petaluma Old Adobe Union School District Expansion and Modernization Projects – Petaluma, California.
LACO provided special inspection and materials testing services during expansion of the 800-square-foot multi-use Old Adobe Elementary School that included a stage addition. The stage addition included reinforced concrete foundations with slab-on-grade, and a welded steel moment frame. LACO also provided special inspection and materials testing services for modernization projects at Loma Vista Elementary and Miwok Valley Elementary Schools. Modernization activities included expansion to the existing administration building, new concrete ramps and walkways, and restroom facility upgrades. We provided the following services: ; Batch plant inspection; Laboratory rebar tensile and bend testing; Special inspection during placement of concrete; Compressive strength testing of concrete; Shop and field welding inspections; Non-destructive testing of completed welds (UT scope).

Roseland Charter High School – Santa Rosa, California.
LACO was present at the rebar fabrication facility to sample and tag individual bundles for laboratory tensile and bend testing. Prior to placement of concrete in foundations and slabs, Mr. Crump performed batch plant inspections to verify that materials and quantities conformed to project specifications. During placement of concrete, Mr. Crump observed procedures, performed temperature and slump tests, and prepared cylinders for laboratory compressive strength testing. During construction of CMU walls, he provided full time inspection, as required by the DSA. During placement of grout in test prisms and CMU walls, Mr. Crump observed procedures and prepared samples for laboratory compressive strength testing. In addition, as required, he obtained 2 core samples of the cured CMU walls for laboratory compressive strength testing.  Mr. Crump performed load testing of post-installed anchors and torque tested high-strength bolts, as required. 

Wade Thomas Elementary School Modular Classrooms – San Anselmo, California.
LACO provided special inspection and materials testing services for this Ross Valley Unified School District project located in San Rafael, California. The project consisted of the construction of two new modular buildings. The building footprints were 1,280 and 1,920 square feet and were constructed on steel-reinforced concrete foundations with slabs-on-grade. We provided the following services: Batch plant inspection; Laboratory rebar tensile and bend testing; Special inspection during placement of concrete; Compressive strength testing of concrete; Field bolting inspections.

Matanzas Creek Elementary School Modernizations – Santa Rosa, California.
LACO provided special inspection and materials testing services during construction activities associated with modernization at the Matanzas Creek Elementary School We provided the following services: Batch plant inspection; Laboratory rebar tensile and bend testing; Special inspection during placement of concrete; Compressive strength testing of concrete; Shop and and field welding inspections; Load-testing of post-installed anchors.

Rincon Union School District Improvements – Santa Rosa, California.
LACO provided special inspection and materials testing services during construction activities associated with a new 60-foot by 40-foot modular Music and Childcare building at the District office, the Spring Creek Elementary School 40-foot by 48-foot modular Classroom structure, and the Matanzas Creek Elementary School Entry Pavilion. The modular units were supported on steel reinforced concrete foundations with concrete porches. The entry pavilion included steel-reinforced concrete foundations with concrete slabs-on-grade and welded columns supporting glue-laminated beams. We provided the following services: Batch plant inspection; Laboratory rebar tensile and bend testing; Special inspection during placement of concrete; Compressive strength testing of concrete; Shop and and field welding inspections; Load-testing of post-installed anchors.

American Canyon High School – American Canyon, California.
Project consisted of a new $125M campus. Materials observation and testing services included batch plant inspection, foundation and slab-on-grade concrete, shop/field steel fabrication inspection and observation during construction of CMU block walls. Special Inspection Services included: Batch plant inspection; Laboratory rebar tensile and bend testing; Special inspection during placement of concrete; Compressive strength testing of concrete; Shop and field welding inspections; Load-testing of post-installation of epoxy anchor.

Diamond Gym Renovation – Marin, California.
Mr. Crump provided all Special Inspection services for this $15 million renovation of the existing gymnasium. Materials testing services included reinforced concrete, CMU block walls, and welding for the pole-mounted solar parking array. Materials observation and testing services included reinforcing steel inspection, foundation and slab-on-grade concrete, shop/field steel fabrication inspection and observation during construction of CMU block walls.

Santa Rosa Charter School for the Arts – Santa Rosa, California.
The project consists of three new one- and two-story structures. All buildings include concrete slab-on-grade floors supported on reinforced concrete foundations.  Construction elements requiring special inspection will include foundation and slab concrete, welded beams and columns, high-strength bolting and glue-laminated beams. We are currently providing the following services: Batch plant inspection; Laboratory rebar tensile and bend testing; Special inspection during placement of concrete; Compressive strength testing of concrete; Shop and field welding inspections; High strength bolt torque-testing; Load testing post-installation of epoxy anchors.

  • Eureka, CA

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