Each Thursday morning, for the last seven weeks, a group of four to six Friends of San Ramon Creek (FSRC) volunteers met in the Whitegate/Cameo area of Danville to remove four stands of Arundo from the Green Valley Creek watershed. Two of the four stands were quite large and very dense. It was hard work but the Arundo has been removed, the rhizomes treated with an herbicide and the rhizome area covered with a geotextile to kill the rhizomes by solarizing (baking) them.
There are over 100 stands of Arundo in the San Ramon Creek subwatershed; most of them are on private property. FSRC is working to develop ways to work with property owners to remove these stands. This particular group of stands was chosen because iit provided an opportunity to test an approach to working with property owners and their neighbors and because is one of the furthest upstream stands.
Working With Private Property Owners
The project started with visits by a volunteer to get permission from the property owners to remove the Arundo. In this case, there were four properties with Arundo; one owned by a Homeowners Association and three owned by homeowners. One of the volunteers met with each of the property owners and explained the issue with Arundo in the creek and described the process to remove it. It took several visits with each property owner to get agreement to the plan for removal, treatment and maintenance. The volunteer then visited with all surrounding property owners to let them know what was happening so they were not surprised. One of the homeowners was insistent that we not use glyphosate.
Small Group of Workers Can Socially Distance
On July 31 the volunteers started attacking the stands one by one. With these large stands it was possible to keep five or six volunteers working and still stay socially distant. In each case a chain saw was used to quickly cut the stalks. The stalks were moved out of the way and piled into large, orderly, piles nearby. We tried not to use bucket brigades to move the canes but depended on a contractor to haul large piles up the hill and to the dumpster.
De-duffing Needed To Treat Stumps
When the stalks from a stand had been removed the team went back and de-duffed the stand. The volunteers used small rakes and hands to remove the leaves, dead stalks and other material that covered the ground between the stumps. The goal was to see the ground between the stalks. This effort was significant. It took about ⅓ of the time that it took to remove the stalks just to de-duff it. The duff was piled up near the stand and left to compost in place.
Treated Stumps With Weedslayer
After de-duffing, the stumps were recut with a chainsaw as close to the ground as practical. Then a volunteer painted each of the cut stumps with a highly concentrated herbicide (50% water, 50% Weedslayer or Roundup custom).
Weedslayer Seems To Work On Stumps
Since the stands were treated over a period of six weeks or so and with different herbicides we were able to see the different impact of the herbicides.
The final part of the treatment was another experiment by FSRC. A geotextile material was cut and laid over the exposed rhizomes and was attached to the ground with long staples. It is hoped that the black material will absorb heat and kill the rhizomes. We are unsure if this technique will work, how long it will take and whether aggressive growth will damage the geotextile. We anticipate leaving the geotextile in place for a year to maximize the effect.
Contractor Hauled Stalks and Chipped Into Dumpster
The piles of stalks were huge, maybe six feet around. They would have filled several dumpsters if we had put them in unchipped. In order to minimize the number of dumpsters required FSRC hired a contractor to haul the stalks to a dumpster and chip them into the dumpster. This seemed to reduce the volume needed to be hauled by ¾ or more. The contractor was able to save a lot of labor by dragging the bundles from the staging area near the stand to the dumpster. A rope was cinched around the bundle of stalks; the other end of the rope was tied to a truck and the truck pulled the pile up next to the chipper.
For more information about this Arundo removal project contact Mike Anciaux at firstname.lastname@example.org.
2020 Arundo Removal Planning is Underway
There are over 110 patches of Arundo in the San Ramon Creek Watershed. In 2019 Friends of San Ramon Creek started treating about 10 of the patches and hope to work on another 10 or more in 2020. We are in the process of selecting the candidates for 2020 efforts using the following criteria
Join The Restoration Trust, Friends of San Ramon Creek, and the Contra Costa Resource Conservation District for a CA native planting event in Danville! We will be planting native plant plugs along a portion of San Ramon Creek in Hap Magee Park. Re-vegetating the creek with native plants makes it more difficult for non-native invasive plants to establish themselves, and it provides habitat and food for wildlife.
For this event, we are limiting registration to 30 volunteers, so sign up at https://tinyurl.com/danvilleplantingevent ASAP. We hope you'll join us!
Date: Saturday, December 14, 2019
Time: 9:30 AM - 11:30 AM
Location: 1025 La Gonda Way, Danville, CA 94526 (just north of the sand volleyball court)
More Important Details:
Abolishing Arundo: The Dreaded Creek Invader
Monday, October 28 | 6:30 - 7:30 p.m
Part of the Nature Series at the Danville Library
Volunteers are eradicating Arundo throughout the San Ramon and Walnut Creek Watersheds. Arundo invades our streams and creates erosion and flooding problems. Get informed and sign up to help efforts to get rid of this invasive, fast growing plant and replace it with natives.
San Ramon Creek: Care and Maintenance
Monday, September 23 | 6:30 - 7:30 p.m
Part of the Nature Series at the Danville Library
Speakers from Contra Costa County Public Works will provide a program for creek owners on the care and maintenance of their creek property. The San Ramon Creek watershed covers 54 square miles and includes San Catanio, Sycamore, Green Valley, Rutherford and Stone Valley Creeks. It is part of the large Walnut Creek watershed.