VSSI also hired a engineering firm to perform and implement the quality control. It's the contractors responsibility to perform the quality control, as the agency does the quality assurance.
Among the duties of the quality control manager is verifying the preparation of the surface of the roadway, that the surface is clean, free of loose material, that thermoplastic has been removed to allow bonding, and the weather is suitable and within the range of the specification.
During construction, the quality control manager has the responsibility of sampling and testing the gradation of the aggregate for the micro surfacing. Test results need to be turned around and reports submitted within 24 hours.
Also, the manager verifies compaction testing for the asphalt repairs, and verifying the depth of patches prior to replacing with asphalt concrete. Daily reports are required to be submitted to verify the notes and acceptance from the FHWA.
There were specific timing requirements for closures on routes. VSSI worked with FHWA and the park service to minimize the impact to traveling public. One-way impact was minimized was a 48-hour complete closure of Conzelman Road East and McCullough Road, which are the most heavily traveled roads within the park.
Message boards were placed by VSSI two weeks in advance of the closure and a press release was sent out by the park service to inform the public of the upcoming closures. It was crucial to complete this section of Conzelman Road and McCullough Road in this 48-hour period to ensure a second notification to the public -- and the inconvenience to the park -- would be avoided.
As part of the contract, Conzelman West was also a complete closure, which included a winding three-mile, one-lane road running along the Pacific Ocean shoreline that has an 18 percent grade. This section proved to be another challenge.
To complete this section of road the crew needed to be confident, cautious, experienced, and equipped with VSS Macropavers to complete this difficult section of roadway. VSSI’s expeditious implementation of resurfacing on some of the parking lots at Muir Beach was remarkable due to the amount of tedious handwork involved, and the need to have the parking open to the public the same day.
Weather on the Marin Headlands can create its own clouds when moist, warm Pacific Ocean breezes are pushed into higher, colder air, causing condensation, fog, fog drip, and perhaps rain.
The crew needed to be flexible with the schedule and start work in areas that were suitable to place micro surfacing and wait for the morning fog to dissipate in the afternoon sun. This was a cause of concern, with a mandatory shut down for Fleet Week, which is an event in San Francisco that draws many tourists to the Golden Gate National Recreation Area.
Overall, VSSI showed tremendous ability to deliver the job on time in that climatically challenging location.
VSSI completed 15 miles of roadway, along with several parking lots, utilizing 2,200 tons of aggregate and 350 tons of micro surfacing emulsion. Black aggregate supplied from George Reed Table Mountain provided the final surface with a dark appearance, rendering the roads aesthetically pleasing for years to come.
VSSI accommodated park service needs throughout the life of the project by providing them flaggers on weekends for their major events.
With the abundance of bicycle traffic VSSI provided delineators on Conzelman East while a drawing was being completed for the reconfiguration of the permanent striping. This was done to create a temporary lane for bikes and mimic the new configuration from bidirectional road to one-way traffic.
Due to the bicyclists' use of the road, post-sweeping needed to be completed to insure the safety of public on the steep down hill roads. VSSI continued to post-sweep throughout Fleet Week in insure the safety of the traveling public.
Once Fleet Week was wrapped up, VSSI completed the remaining items on the contract and the job was accepted by the National Park Service.
The cooperation between VSSI, the FHWA and the NPS, the overall product, safety of the crews and traveling public was a great success, providing a scenic roadway that all visitors will enjoy for years.