• The Point Reyes Beach as viewed from the Point Reyes Headlands

    Point Reyes

    National Seashore California

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  • 2014 Harbor Seal Pupping Season Closures

    From March 1 through June 30, the park implements closures of certain Tomales Bay beaches and Drakes Estero to water-based recreation to protect harbor seals during the pupping season. Please avoid disturbing seals to ensure a successful pupping season. More »

  • 2014 Winter Shuttle Bus Operations Have Ended

    March 30, 2014, was the last day for the 2014 Winter Shuttle Bus System. Sir Francis Drake Blvd. is open daily from now through late December 2014. More »

  • Operational Changes Took Effect on May 1, 2013

    The Lighthouse Visitor Center is now only open Fridays through Mondays; closed Tuesdays through Thursdays, including Thanksgiving. The Kenneth C. Patrick Visitor Center is open on weekends and holidays when shuttles are operating. More »

Giacomini Wetland Restoration Project: Summary of Construction Under Phase I and II: Where Did Excavated Soils From Phase I and II Go?

 

Unlike most of the wetland restoration projects in San Francisco Bay where there is a deficit of sediment, this restoration project had to contend with the fact that the Giacomini Ranch had an excess of sediment and is topographically higher in elevation than it was historically. Therefore, sediment had to be excavated in order to achieve some of the restoration goals. In the EIS/EIR, total excavation was estimated at 257,000 cubic yards (CY) of soil and more than 1,000 CY of concrete, pipe, and other non-soil materials. On-site disposal was originally estimated to be 76,000 CY, with off-site disposal closer to 170,000 CY for soil and 1,000 CY for non-soil materials.

Throughout the planning for Phase I and II, the Park Service, PRNSA, and its consultants strived very hard to minimize the amount of off-hauling of sediment from the project site by re-using soils on-site. Much of the soils retained on-site were used for final grading of the Park Service-owned portions of the Dairy Mesa, filling of the manure ponds, filling of drainage ditches, and creation of special status species habitat.

 
Hauling trucks lining up to receive soils for hauling to the quarries during Phase I

Hauling trucks lining up to receive soils for hauling to the quarries during Phase I.

During Phase I, approximately 40,000 CY of soil was excavated, with approximately 32,300 CY reused on-site for restoration of the Dairy Mesa and creation of a berm around the Tomasini Triangle Marsh. Approximately 7,500 CY was hauled from the East Pasture to the Evans I Quarry on Tomales Point for restoration, with an additional 6,750 CY hauled from Olema Marsh after creation of the two Olema Creek Frog Ponds. During Phase II, approximately 119,000 CY was excavated, with approximately 91,103 CY re-used on-site for restoration of the Dairy Mesa, filling of drainage ditches, creation of special status species habitat, and sidecasting of soils on-site (Olema Marsh). The remainder, 27,897 CY, was hauled to the quarries.

For both phases, then, restoration resulted in excavation of 159,000 CY, a drop of 38 percent in total excavation relative to that estimated in the EIS/EIR. The amount off-hauled totaled approximately 42,147 CY, which was 75 percent less than was originally estimated in the EIS/EIR.

 
One of the quarries slated for restoration prior to construction.

One of the quarries slated for restoration prior to construction.

Despite these tremendous strides in reusing more soils on site, some soils still needed to be hauled off-site during construction. These soils were hauled to quarries on the Tomales Point portion of the Point Reyes Peninsula. The Park Service administratively closed quarries in the Seashore in 1991. Since then, the Seashore has been interested in restoring the quarries to a more natural appearance characteristic of this coastal prairie landscape, but the soils needed to restore the natural contours of this hillside quarries have not been available. The Giacomini project provides some soils to be used as a base for restoring the hillslope. A native topsoil layer will be placed on top of the imported soils to maintain ecological integrity and allow for appropriate native plant restoration over the next few years.

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Did You Know?

Harbor Seal Pup, © Sue Van Der Wal

Harbor seals (Phoca vitulina) are present in the waters of Point Reyes year round. Every spring, approximately 7,000 harbor seals, or 20% of the mainland California breeding population, haul out on the beaches of Point Reyes. Look for them in the esteros and in Tomales Bay and Bolinas Lagoon. More...