| HRHolliday Rock Co., INC. | Rialto | — | ◇ UNVERIFIED |
| HRHolliday Rock Colton Plant 4 | Bloomington | — | ◇ UNVERIFIED |
| HRHolliday Rock Company, INC | Littlerock | — | ◇ UNVERIFIED |
| HRHolliday Rock Company - Mountain View | Upland | — | ◇ UNVERIFIED |
| HRHolliday Rock Company - Van Nuys | Van Nuys | — | ◇ UNVERIFIED |
| HRHolliday Rock - Irvine | Irvine | — | ◇ UNVERIFIED |
| HRHolliday Rock San Bernardino 29 | San Bernardino | — | ◇ UNVERIFIED |
| HRHolliday Rock - San Bernardino Facility | San Bernardino | — | ◇ UNVERIFIED |
| HRHolliday Rock Santa Ana 25 | Santa Ana | — | ◇ UNVERIFIED |
| HRHolliday Rock Ventura 27 | Ventura | — | ◇ UNVERIFIED |
| HRHolliday Rock Westminster 20 | Westminster | — | ◇ UNVERIFIED |
| HCHoya Corporation USA | Fremont | — | ◇ UNVERIFIED |
| IMIndustrial Minerals CO | Sacramento | — | ◇ UNVERIFIED |
| ICInland Concrete Products INC | Fontana | — | ◇ UNVERIFIED |
| IIIsolatek International INC | San Bernardino | — | ◇ UNVERIFIED |
 Jensen Enterprises INC Dba Jensen Precast | Ontario | — | ◇ UNVERIFIED |
| JIJifco INC | Livermore | — | ◇ UNVERIFIED |
 Johns Manville CORP | Corona | — | ◇ UNVERIFIED |
| JRJ & R Concrete Products INC | Perris | — | ◇ UNVERIFIED |
| KSK Source INC. | Compton | — | ◇ UNVERIFIED |
| LALas Animas Concrete & Bldg Su | Santa Cruz | — | ◇ UNVERIFIED |
| LGLibbey Glass INC | Industry | — | ◇ UNVERIFIED |
| LCLivingston's Concrete Service INC | Olivehurst | — | ◇ UNVERIFIED |
| LALos Angeles Plant 15 | Los Angeles | — | ◇ UNVERIFIED |
| LSLucas Site | La Puente | — | ◇ UNVERIFIED |
| LSLundberg Studios | Davenport | — | ◇ UNVERIFIED |
| MAMagnum Abrasives INC | San Bernardino | — | ◇ UNVERIFIED |
| MPMar-con Products INC | San Marcos | — | ◇ UNVERIFIED |
| MEMartin Enterprises Dba Tj Composites | Nuevo | — | ◇ UNVERIFIED |
| MPMiramar Plant 33 | San Diego | — | ◇ UNVERIFIED |
| MPModerno Porcelain San Diego LLC | Santee | — | ◇ UNVERIFIED |
| MGMountain Gate Quarry | Redding | — | ◇ UNVERIFIED |
| NRNational Ready Mix Concrete | Van Nuys | — | ◇ UNVERIFIED |
| NRNational Ready Mix Concrete CO | Santa Clarita | — | ◇ UNVERIFIED |
| NRNational Ready Mix Concrete CO | Irvine | — | ◇ UNVERIFIED |
| NRNational Ready Mix Concrete CO. | Los Angeles | — | ◇ UNVERIFIED |
| NRNational Ready Mixed Concrete CO | Irwindale | — | ◇ UNVERIFIED |
| NRNational Ready Mixed Concrete CO | Canoga Park | — | ◇ UNVERIFIED |
| NRNational Ready Mixed Concrete CO | Artesia | — | ◇ UNVERIFIED |
| NINewport Industrial Glass INC | Stanton | — | ◇ UNVERIFIED |
| NUNewport-mesa Uni Sch Dist | Costa Mesa | — | ◇ UNVERIFIED |
| NRNor-cal Rock INC | Hayward | — | ◇ UNVERIFIED |
| NANorth American Recycling and Crushing LLC | Anaheim | — | ◇ UNVERIFIED |
| NSNorth Star Water Treatment Facility | Grass Valley | — | ◇ UNVERIFIED |
| OROceanside Rmc Plant | Oceanside | — | ◇ UNVERIFIED |
| OIO'keeffe's INC. | Merced | — | ◇ UNVERIFIED |
| OOldcastle | Morgan Hill | — | ◇ UNVERIFIED |
| OIOldcastle Infastructure | Stockton | — | ◇ UNVERIFIED |
| OPOldcastle Precast | Lakeside | — | ◇ UNVERIFIED |
| OPOlson Precast CO | Rialto | — | ◇ UNVERIFIED |
