Interstate 405 Sepulveda Pass Northbound Carpool Lane
Los Angeles, CA
The I-405 Sepulveda Pass northbound carpool lane and widening project was an eight-mile freeway improvement project spanning from Interstate 10 to the State Route 101 and Interstate 405 interchange in Los Angeles California. DLCE’s staff took a major role in the preparation of design drawings for construction. This included completing highway geometric design and cross-section details for the modification of street crossings. Design work also included the modification of on and off ramps along with local streets and roads redesign. DLCE staff used the latest design software (Microstation, Inroads) to provide innovative design solutions in line with Caltrans standards.
I-405 Improvements Project (OCTA)
Orange County, CA
The California Department of Transportation (Caltrans) is widening the San Diego Freeway (I-405) between State Route 73 (SR-73) and Interstate 605 (I-605). The project spans 16 miles and will involve making improvements to freeway entrances, exits, and bridges as well as adding one regular lane in each direction between Euclid Street and I-605. Additionally, the project will add 405 Express Lanes, incorporating the existing carpool lanes and a new lane in each direction between SR-73 and I-605.
Our firm is currently providing construction engineering support services for major bridge overcrossing and undercrossings, structural retaining walls, and Mechanical Stabilization Embankment (MSE) walls. Our engineering analysis will also include work on bridge structures, cost estimating, quantities, design reviews, and analysis. We work closely with our clients, carrying out design checks for compliance with local and national design standards, using the latest engineering structural and design tools plus providing CADD support services.
State Route 710 South Environmental Freeway Improvements
Los Angeles, CA
The SR-710 Improvement study project is an MTA funded project. The project studies involved the analysis of a number of alternatives starting at the north end of the SR-710 to connect the SR-210 (Pasadena). A number of alternatives were evaluated, including a highway and/or transit tunnel, bus rapid transit (“BRT”), highways, street improvements, light, and underground heavy rail systems.
The objective of the study is to help alleviate traffic congestion within the area and the Los Angeles basin. DLCE’s staff was responsible for the preparation of a number of technical reports. DLCE prepared numerous electronic drawings which include the identification of conflicts of the existing utilities with respect to the new proposed facilities as well as reviewed and evaluated a number of track alignments.
Interstate 605 Freeway Corridor “Hot Spots”
Los Angeles, CA
This project encompasses the preparation of a corridor analysis report and drawings for MTA & Caltrans for the future reconstruction of I-605 interchanges and freeway facilities in Los Angeles County. The corridor analysis identified chronic traffic congestion areas, potential capacity, and operational improvements, and considered adjacent development and right-of-way limitations, also referred to as “Hot Spots”.
The freeway corridors evaluated include SR-91 from I-710 to the Orange County line, I-605 from SR-60 to I-405 freeway, and I-405 from Lakewood Boulevard to just south of the I-605 interchange. They also include areas along the I-105 from I-710 to I-605 and SR-60 east and west of I-605. DLCE staff prepared detailed documents for the identification of aboveground and underground utilities along the I-605 corridor. DLCE prepared all documentation with the latest design and CAD software (Microstation).
State Route 125 – San Diego Council of Governments, Caltrans District 11
San Diego, CA
The South Bay Expressway 125 South toll road is a 9.2-mile, privately-developed southern extension of SR 125, extending from San Miguel Road in Bonita, CA near the Sweetwater Reservoir to SR 905 in Otay Mesa, near the International Border. The project connects the only commercial port of entry in San Diego to the regional freeway network.
DLCE was involved in the preparation of the environmental planning study and provided design support to the design-build concessionaire. This included highway and local streets and roads geometric design, grading, estimating, and utility identification/relocation. Also played a major role in the preparation of the final plan, specifications, and estimates (PS&E) for existing local roads at Fanita Road, Santee Avenue to South of Navajo Bridge. DLCE staff prepared a hydrologic and hydraulic report, located existing underground and above ground utilities, identified conflicts, and the proposed relocation of utility lines. Additionally, we delivered a utility matrix that identified all major utilities and prepared quantities for final estimates that were within the project’s constraints.
State Route 94 – San Diego Council of Governments/Caltrans District 11
San Diego, CA
SR-94 is a two-lane rural highway that provides vehicular and truck access from the San Diego urban area to the southeastern communities of the county to the International Port of Entry at Tecate. DLCE prepared Advance Planning Studies for several bridges along this 20 mile corridor. Also, DLCE prepared designs for a number of bridge widenings and retrofits in accordance to Caltrans design specifications.
SR-57/60 Interchange Improvement Project
Diamond Bar, CA
The SR-57/SR-60 Interchange Improvements will stretch from just south of the northbound SR-57/SR-60 merge to eastbound SR-60 and south of the Golden Springs Drive overpass and along a portion of Grand Avenue from the City of Industry to the City of Diamond Bar. This is a Caltrans District 7/Los Angeles County Metropolitan Transportation Authority (Metro) sponsored project.
DLCE is currently providing engineering services in preparation of Plans,
Specifications and Estimate (PS&E). Our engineers are providing civil engineering support services including cost estimating, quantities, civil engineering plan production support, and CADD design support. We make sure all of our work is in accordance with state and federal standards and requirements.
I-605/SR-60 Interchange & Ramp Upgrades
Whittier/South El Monte/City of Industry, CA
The I-605 serves as one of the few major north-south interstate freeways in the greater Los Angeles Area of Southern California and the operational conditions along the project corridor are deteriorating. In order to improve local circulation and connectivity to interstate commerce, I-605 improvements are necessary.
D’Leon provided geometric engineering design support for the interchange and ramp improvements along the I-605 and State Route 60 Freeways. This is a Caltrans District 7/Los Angeles County Metropolitan Transportation Authority (Metro) sponsored project. Our engineers provided engineering support which included the preparation of the project’s Project Approval/Environmental Document and used Caltrans Design Manuals and Specifications for all design-related documents. Our firm provided CADD design support using the latest engineering software to produce accurate and quality solutions.
I-605/I-5 Interchange & Auxiliary Lanes
Downey/Sant Fe Springs, CA
This alternative is part of the I-605 Improvement project which will add auxiliary lanes as needed between on- and off-ramps, add new HOV lane to northbound and southbound direction from Florence Av to Rio Hondo Channel. It also includes a safety improvement which will increase inside shoulder and lane widths to full standard.
DLCE provided civil engineering services including geometric design, utility
design, drainage, and CADD design support for major interchange improvement project for Caltrans District 7/the Los Angeles County Metropolitan Transportation Authority. Our engineers worked closely with local cities in third-party coordination related tasks. Our firm provided CADD design support using the latest engineering software to ensure quality and accurate services.
