Arizona Rock Products Association Presentation

Written by Alyssa Burley.

On Wednesday, June 8, 2016, the Arizona Rock Products Association held its convention at San Diego's historic Hotel Del Coronado. 

At the event, Project Cornerstone's executive director, Crystal Howard, along with Hanson Aggregates' Terry Tyson, spoke to the audience about community relations and Project Cornerstone's successful educational and outreach programs.

The crowd asked great questions following the presentation and were highly supportive of Project Cornerstone's mission to educate the public about the importance of local construction aggregates (i.e., sand, gravel and crushed stone) through hands-on learning in Science, Technology, Engineering and Mathematics (STEM).

Contact us to schedule a presentation at your convention, group meeting or event.

17th Annual Mira Mesa Street Fair

Written by Alyssa Burley.

On Saturday, September 19, 2015, Project Cornerstone participated in the Mira Mesa Street Fair

The community fair is an annual event that draws community organizations, businesses, crafters, elected officials, military and law enforcement agencies to mingle with the community.

Project Cornerstone's booth drew a steady stream of people throughout the day.  Around 150 adults and children made concrete stars while learning about the importance of the local construction aggregates industry in their community. 


Hanson Aggregates, an event sponsor and local construction aggregate quarry operator, displayed a loader for visitors to tour, handed out soil and seeds, and free canvas bags. 


Thank you, Hanson Aggregates, for inviting Project Cornerstone to participate in this event and kindly including us on the canvas bag give-a-ways.

Field Trips with Students from Cajon Valley Middle School

Eric Inouye explaining the different sizes of materials at the quarry.

Eric Inouye explaining the different sizes of materials at the quarry.

Written by Alyssa Burley.

On February 19th, March 10th, 19th and 24th, Project Cornerstone conducted four of five scheduled field trips to Hanson Aggregates' Santee Rock Quarry at the Sycamore Landfill in Santee, CA.  The final field trip for the 2014-2015 school year will take place on Monday, April 20, 2015.

On each field trip, Eric Inouye from Hanson Aggregates and Gabe Gonzales from Republic Services led sixty sixth-grade students from Cajon Valley Middle School, on a tour of the landfill and rock quarry site.

Nick Qualin and Eddie Chapman performing a gradation analysis using a mechanical sieve.

Nick Qualin and Eddie Chapman performing a gradation analysis using a mechanical sieve.

Shane Hancock, Nick Qualin, Eddie Chapman, John Portlock and Trisha Moore from Hanson Aggregates, and Crystal Howard, Alyssa Burley and James DeCarolis from Project Cornerstone, assisted with the field trip.  They guided students as they rotated through three stations where they learned how to perform a gradation analysis on sample materials, made concrete, and learned about the heavy equipment used to mine rocks at the quarry.

Using a mechanical sieve to separate the rocks into various sizes, the student were able to evaluate the data, calculate percentages, and determine if the sample met the material specifications.

Students making concrete.

Students making concrete.

Students learned about the materials needed to make concrete (i.e., sand, gravel, cement and water), where quarries are located relative to their school, and then they made small batches of concrete.  The students poured their concrete mixtures into silicone molds of footballs, trucks, butterflies, flowers and other fun shapes.  Once the concrete was cured, they were returned to the students to take home.

Each student was able to sit in the cabs of loaders and a concrete truck.  They asked questions about how the equipment worked and had their individual photos taken.  After the field trip, students were given the photos to take home.

Students touring the inside of a loader.

Students touring the inside of a loader.

A few students asking Eddie Chapman questions about the hillside.

A few students asking Eddie Chapman questions about the hillside.

Students' photos from the field trip.

Students' photos from the field trip.

Sycamore Landfill and Rock Quarry. Photo courtesy of Republic Services.

Sycamore Landfill and Rock Quarry. Photo courtesy of Republic Services.

Sycamore Landfill and Rock Quarry
Hanson Aggregates is the quarry operator who extracts and crushes the stone from the Sycamore Landfill quarry site.  The crushed stone is then used to make construction materials that build and maintain the community’s infrastructure (e.g., roads, bridges, schools and homes).

Republic Services operates the landfill.  The voids left from the stone extraction are filled with the community’s refuse.

By-products from the quarry (i.e., dirt, aka yellow fill) are used to cover the refuse in the landfill.

It’s a perfect partnership - the crushed stone is removed from the site to build and maintain our infrastructure, while making room to dispose of our community’s refuse.

Photos by Alyssa Burley.

Updated 3/31/2015.

Ancient Building Material Is Still Used In Downtown San Diego Construction

Written by Alyssa Burley.

In November, Hanson Aggregates trucks were lined up to pour concrete in Downtown San Diego.  Concrete is an ancient building material that is still used in many construction projects around the world.

Did you know:

  • The ancient Romans were the first civilization to use concrete as a building material.  Built by the Romans between 118 - 128 AD, the Pantheon's dome is the largest unreinforced concrete dome in the world.  And, we still use concrete in nearly all building projects today!
  • Concrete is used to build highways, bridges, retaining walls, sidewalks, roads, high-rise building, foundations, and even kitchen counter tops!
  • Concrete is the number one building material in the world.  It is used twice as much as all other building materials combined. (ECOSMART)
Photo by Crystal Howard.

Photo by Crystal Howard.

Pantheon.  Photo courtesy of

Pantheon. Photo courtesy of

More fun facts about concrete may be found at and

Send us your pictures of construction aggregates being used around San Diego County.

Hanson's Truck Makes Appearance In SANDAG September Newsletter

Written by Alyssa Burley.

The San Diego Association of Governments' (SANDAG) September newsletter was released September 30, 2014.

In the latest issue, an article about transportation bonds pictured a Hanson Aggregates truck to illustrate the transportation improvements made by the sale of $350 million in tax-exempt, fixed-rate bonds.

Photo courtesy of  SANDAG

Photo courtesy of SANDAG

The local San Diego construction aggregates industry plays a vital role in maintaining  our transportation infrastructure. 

Construction aggregates are sand, gravel and crushed stone used to make common building materials like concrete and asphalt, among many other applications. 

While local supplies of construction aggregates are key to keeping transportation project costs low, the County is facing a shortage.  This means the cost to ship the needed materials to San Diego will raise the cost of every project.

San Diego County has plenty of material to satisfy demand, though.  Production is slowed by the lack of new mine site permits.

Permitting of new construction aggregate sites is essential to maintain local transportation infrastructure at a reasonable cost to tax payers.

Project Cornerstone Member Contributes to Local East County Posse Project

Written by Alyssa Burley.

Project Cornerstone member, Hanson Aggregates, is well versed in philanthropic endeavors.  The company recently contributed materials to a project organized by the East County Posse, a local non-profit charity dedicated to helping fellow East San Diego County residents in need.

The East County Posse is in the process of building a room addition for the Lim family in Lakeside, CA.  The family has a severely disabled child that is unable to navigate the stairs to access the bedrooms located on the second floor.  As a result, one of the parents has had to sleep in the living room with the child to ensure its safety at night.  The family has done everything within their capabilities to satisfy the needs of their child, and is coping with their situation as best as they can.

The Posse is addressing the family’s needs by building a bedroom on the ground floor of their home.  The room addition is built at no cost to the family and is supported by Posse member donations and the generous donations from several sponsors outside of the organization.

Photos courtesy of East County Posse.

A San Diego company, Hanson Aggregates, contributed the concrete for building the room addition’s foundation.

"Thank you for the opportunity to assist with this worthwhile community project,” said Ralph Reagan, Hanson's Senior Outside Sales Rep.  

The company operates six ready mixed concrete plants throughout San Diego County and has been active in the community.

The East County Posse has nearly 100 members with many of them working in the construction industry.  Their skills and networks are often used in building projects in the East County.  To learn more about the organization, visit

For more information about Hanson Aggregates, visit