Hart Crowser Hawai‘i Office He‘eia Work Day

He‘eia Stream Estuary

The Hart Crowser Hawai‘i team working at He‘eia Stream Estuary. In the area in the right half of this photo we’ve removed the invasive knot grass. The remaining akulikuli is looking a bit trampled, but will recover quickly and thrive.

On Wednesday, June 27, the Honolulu staff each dedicated a vacation day to volunteer with Hui Ko‘olaupoko (HOK) at He‘eia, O‘ahu. HOK is a non-profit watershed management group established in 2007 to work with communities to improve water quality through ecosystem restoration and storm water management, focusing specifically in the Ko‘olaupoko region on windward O‘ahu. HOK’s mission is to protect ocean health by restoring the ‘āina: mauka to makai (land: mountain to sea).

HOK implements innovative projects that effectively manage and protect water quality and natural resources. Projects have included storm water low-impact development projects such as rain gardens, and other watershed focused projects.

The He‘eia estuary restoration project is a collaboration with several other non-profits to restore the ecosystem of He‘eia Stream. This project is aimed at improving water quality and increasing habitat for native aquatic animal species by removing invasive plants and replanting native Hawaiian species. In the past 3 years, about 4 acres of mangrove have been cleared and native species planted. Our work for the day consisted of removing invasive “knot grass” from the estuary flats where it was overwhelming the native vegetation that was planted following removal of the mangrove.

For the plant nerds among us, the predominant native vegetation we protected in the estuary flats were:

  • Akulikuli (Sesuvium portulacastrum), an indigenous coastal succulent ground cover that has been very successful in the estuary
  • Mau‘u‘aki‘aki (Fimbristylis cymosa), a sedge that forms short, rounded tufts of light green narrow, stiff, erect blades
  • Ahuawa (Mariscus javanicus), a greenish blue rush with beautiful brown spiky umbrella flowers/seed pods

We also got to see many native and rare species that have been planted along the stream bank, including Ilima with its tiny flowers that need about 500 to make a lei!); Lama; Ohai; and Mao hau hele. All of these plants have interesting cultural uses and significance, well explained at these website links by our friends at Hui Kū Maoli Ola, an amazing native plant nursery in upper He‘eia.

One of the delights of working on this project was getting to visit the adjacent He‘eia Fishpond. Paepae o Heeia, another non-profit, has been restoring the 88-acre, 800-year-old fishpond since 2001. He’eia Fishpond was likely constructed by hundreds, if not thousands, of Hawaiians who passed and stacked rocks and coral for approximately 2-3 years to complete the 1.3-mile wall. Fishponds helped Hawaiians practice sustainable aquaculture long before western contact. There are only a few fishponds remaining of the approximately 100 that are known to have existed on O‘ahu, as most have been destroyed by development. Restoration of remaining fishponds has been a big part of the Hawaiian cultural renaissance over the past 25 years. While we didn’t work on the fishpond itself, we were able to cross the stream to walk on the fishpond walls (which are dry stacked!), to view the functioning sluice gates, and to learn more about fishponds.

We had a fun team-building day that successfully cleared invasive species from a large area, and learned a bit more about native plants and Hawaiian culture around fishponds. Thanks to HOK for hosting us, and kudos to our Hawai‘i team for being adventurous and volunteering their own time to take on this project!

Ko‘olau mountains

The beautiful Ko‘olau mountains in the distant background, a portion of the fishpond wall and sluice hale in the midground, and our team working hard in the foreground.

Walking on Fishpond Wall

Walking on the fishpond wall after a long day of work; the enclosed fishpond is to the left, with the open waters of Kāne‘ohe Bay to the right.

Hawaii team

Our Hawaii team is all smiles visiting He‘eia Fishpond after a long day of work helping to restore He‘eia Estuary.

Sluice gates

The working mākāhā (sluice gates) of He‘eia Fishpond.

Ilima,official flower of O‘ahu

The beautiful native Ilima, the official flower of O‘ahu. The little flowers are treasured for lei – it takes more than 500 of these flowers to make a delicate and special lei.

 

You Shall Not Pass

Chinook Salmon

Removing Fish Barriers

In 1969, a burning river helped draw attention to the polluted state of many United States waterways. Since then, much progress has been made to clean them up, allowing wildlife to thrive in habitats that were once dead. It’s only more recently that attention has migrated (pun intended) to fish passage problems.

According to NOAA, In the United States, more than 2 million dams and barriers block fish from migrating upstream to spawning and rearing habitat. The Washington State Department of Transportation (WSDOT) says that a little under two thousand culverts block fish passage along Washington highways. As of last year, WSDOT completed 319 fish passage projects, but there is still much to accomplish.
Read on for an example of a recent project, what services are needed to clear the way, and information about Washington, Oregon, Hawaii, and Alaska organizations that are trying to make a difference.

Example of a Fish Passage Project—Rue Creek

Before construction

Rue Creek before construction.

After construction

Rue Creek after construction.

The Pacific Conservation District received a Washington Coastal Restoration Initiative grant from the Washington State Recreation and Conservation Office. Hart Crowser supported the Pacific Conservation District with design and development of two culvert replacements on Rue Road in Pacific County.

Fish passage and flow conveyance capacity were restored by removing the existing culverts and overlying fill, and installing a 50-foot bridge that met design requirements in the Washington Department of Fish and Wildlife’s Water Crossing Design Guidelines and Washington State Department of Transportation’s Standard Specifications for Road, Bridge and Municipal Construction and Design Manual. Staff then used the stream simulation approach (one of the methods to size and design culverts that is an option in the Washington Department of Fish and Wildlife’s Water Crossing Design Guidelines) to design the pattern, dimensions, and other features of the stream channel at the crossing, which would enable safe passage of juvenile and adult salmonids both upstream and downstream. An added benefit was that the replacement should prevent the creek from flooding Rue Creek Road and nearby residences.

Services Needed for Fish Passage Projects

These projects can require:

  • Hydraulic engineering
  • Geotechnical engineering
  • Stream reach assessment
  • Wetland delineation
  • Permit applications to comply with Section 404 of the Clean Water Act, Section 7 of the Endangered Species Act, and other federal, state, and local permit requirements. For the Rue Creek example above, this included preparation of a JARPA, SEPA checklist, ESA Section 7 Biological Assessment, Essential Fish Habitat assessment, and Stewardship Plan.

Action on the Local Level

Washington

In 2014, the Washington State Legislature created the Fish Passage Barrier Removal Board to develop a coordinated barrier removal strategy and provide the framework for a fish barrier grant program. Its stated mission is to “identify and expedite the removal of human-made or caused impediments to anadromous fish passage in the most efficient manner practical through the development of a coordinated approach and schedule that identifies and prioritizes the projects necessary to eliminate fish passage barriers caused by state and local roads and highways and barriers owned by private parties.”
The board has monthly meetings; agenda and meeting handouts are available on its website. It advanced its first project list to the legislature, which has been funded.

Oregon

The Oregon Department of Fish and Wildlife has a nine-member Fish Passage Task Force, which “advises the Oregon Department of Fish and Wildlife and the Fish and Wildlife Commission on matters related to fish passage. These matters include, but are not limited to, rulemaking to implement statutes, funding and special conditions for passage projects, and exemptions and waivers.” The most recent agendas and minutes are at the link above; older ones are here.

Hawaii

The Pacific Islands Fish and Wildlife Office of The US Fish and Wildlife Service says that the Hawaii Fish Habitat Partnership “is composed of a diverse group of partners that have the capacity to plan and implement a technically sound statewide aquatic habitat restoration program. The partnership is committed to implementing aquatic habitat restoration in the appropriate landscape scale to achieve conservation benefits.”

They list “instream structures and barriers including stream diversions, dams, channel alteration, and road crossings” as one of eight key threats to freshwater species and habitat.
See the Pacific Islands Fish & Wildlife Office annual report for fiscal year 2017 for more information.

Alaska

The Alaska Department of Fish and Game has a fish passage inventory database with information about 2,500 stream crossings. They have partnered with other organizations to complete at least 33 culvert replacements.

You Shall Pass

A blocked river isn’t as dramatic as a burning river, which makes it harder to draw attention to the plight of the remaining blocked fish. But the hope is that continued effort will forward the progress that is already being made.

Stream Restoration Certification Program Fills Pressing Need

Case Study Presentation

Brad Hermanson and Timmie Mandish present a stream restoration case study.

Fish habitat across the country has been seriously impacted from years of human activity.  There is considerable effort now being made to repair the damage done and improve the chance for fish survival. There is a pressing need for professionals trained and certified in stream restoration.

To meet the need, Portland State University (PSU), in concert with several resource agencies, created a stream restoration certification program.  The one-year program, with five core and a number of elective courses, is the only one of its type in the country.  Started in 2006, the stream restoration program has certified over 160 students in advanced concepts of stream restoration.

Brad Hermanson, Hart Crowser’s Manager of Environmental Sciences and Engineering, co-leads the three-day core course “EPP 225 – Restoration Project Management” with Timmie Mandish of USDA-Natural Resources Conservation Service.  EPP 225 covers topics ranging from fundamentals of project management and project risk management, to contracting strategies, regulatory permitting, construction options, and real-life case studies. Besides co-leading the course, Brad teaches the first half-day kickoff portion, introducing the students to concepts on project management and project risk management.

This year’s EPP 225 course was offered at PSU December 5-7.  There were 32 students, most employed by state and federal natural resource agencies, but also several independent consultants and contractors.  Review comments from the students were very positive.  One student noted “Definitely exceeded my expectations. I’m a scientist.  I tend to underestimate how essential project management is.  The class gave me crucial skills that will probably be serving me in the future.  I learned a ton!  Thank you so much.”  Another stated “…was great to combine project management with the river restoration lens.  I have a PM background and this helped to hone those skills – reminders and tools to communicate, evaluate risk, prepare for unique (project) changes – all are very useful and will strengthen me in my career.”

Course participants

32 students, including state and federal natural resource agency employees, attended the 2017 course.

STEM for Future Generations

Jessica teaching about salmon

Science, Technology, Engineering, and Mathematics (STEM) schools in our area and across the country are working to improve the way our students learn in these subject areas. These STEM-focused schools offer a more hands-on approach to teaching, from using objects students can physically manipulate to working with resources and companies in the area to bring in experts to teach the students more about these fields.

This is why Jessica Blanchette, a marine biologist at Hart Crowser, volunteered her time to educate the 4th graders of Odyssey Elementary on the life cycle of salmon, a crucial element of the ecological community of the Pacific Northwest.

Using multiple instructional strategies, including hands-on activities and colorful presentation materials, Jessica captivated Mukilteo School District students with her knowledge of fry, parr, and smolt—the salmon life cycle. Students had many questions and Jessica had plenty of answers!

Jessica led a thoughtful discussion about the human relationship with salmon, our impacts on them, and ways in which we can promote a successful co-existence. There was excitement in the classroom as the lesson wrapped up: not only because of the activities and new knowledge, but also because the students were beginning to see that one day they, too, can be scientists.

When scientists like Jessica share their time to promote STEM, it has a positive and lasting impact in the community. Hopefully, with more endeavors such as this, local scientists will make a positive difference in our world and for future generations.

Salmon Life Cycle

Mussels Reveal Impact of Puget Sound Stormwater

Bay Mussels

Native mussels (Mytilus trossulus) like these were used to evaluate the degree of contamination in Puget Sound nearshore habitats. Photo: Brewbooks

The mission of the Washington Department of Fish and Wildlife (WDFW) is to preserve, protect and perpetuate fish, wildlife and ecosystems while providing sustainable fish and wildlife recreational and commercial opportunities. An important initiative is evaluating the impacts to nearshore aquatic areas from stormwater discharges. Mussels sieve the water as they feed, and their tissues absorb and retain chemicals and pathogens, so the WDFW led a study using mussels as an indicator organism. They got help from so many organizations and volunteers, the list fills nearly an entire page. It includes the Snohomish County Marine Resources Council (Mike Ehlebracht, Hart Crowser geochemist, volunteers for the MRC), the Washington State Department of Ecology, other governmental agencies, native American tribes, and various non-governmental organizations. The work was funded under the new Stormwater Action Monitoring (SAM) program that is paid for by municipal stormwater permit holders.

How Was the Study Done?

As part of this study, the WDFW and volunteers placed “clean” caged mussels at over seventy locations across Puget Sound, including highly industrial areas (such as Smith Cove and Salmon Bay), urban areas like the Edmonds waterfront, and rural areas (such as the San Juan Islands). They left the caged mussels in the water for several months, then retrieved them, often in the dark, in cold and blustery weather. They tested them for stormwater-related contaminants including PAHs (produced by burning coal, fossil fuels, wood, and garbage), PCBs (used in electrical apparatuses, surface coatings, and paints; banned in the US in 1979), metals, PBDEs (used in flame retardants), DDTs (insecticides; banned in the US since 1972), and others.

And the Results…

The study showed that stormwater discharges continue to impact the nearshore aquatic environment, particularly in industrial and highly urbanized (paved) areas. PAHs and PCBs were the most ubiquitous, problematic chemicals detected in the mussels, with some of the highest concentrations found in Elliott Bay (particularly Smith Cove).

Puget Sound is a large, complex, and diverse estuary. This data will be critical in determining best management practices and providing recommendations for environmental remediation. The next round of sampling will occur this fall, with updated data available in another year or two.

Download a copy of the Stormwater Action Monitoring 2015/16 Mussel Monitoring Survey: Final Report.

Questions? Contact Mike Ehlebracht.

Placing caged mussels

Snohomish County Marine Resources Council volunteers and staff place caged mussels.

There’s a Volcano on our Project Site

Water is the life blood of any city, but its systems are not always pretty. So the two-million-gallon Forest Park Low Tank was embedded into the hillside to preserve the natural character of the area and leave unfettered views. However, this presented engineering challenges. Overcoming those challenges helped us win a 2017 Grand Award from the American Council of Engineering Companies (ACEC).

Wait—What’s Down There?

The subsurface conditions were quite unusual. Maps showed them as hard volcanic rock, but our geotechnical explorations discovered a new volcanic vent, as yet unmapped. Although of great interest to geologists, volcanic vents are rarely built on. A search of case histories did not find any information to guide the process. We embarked upon an exploration and laboratory testing program to determine if the 100-foot plus pile of cinders would support the tank. We determined that the cinders were fairly uniform across the area, resulting in uniform support for the tank. Our testing further determined the magnitude of loading the cinders could support. With this information we were able to design a foundation that did not require expensive subgrade improvements or pile foundations.

Our high-tech analyses confirmed a low-tech approach would work.

Burying Infrastructure to Preserve the Natural Beauty

In many places, water tanks are constructed within large cuts that many may view as eyesores and which permanently remove natural habitat. This has been accepted over decades as a necessary compromise to provide a robust water supply to our cities. However, this compromise does not need to be accepted. Much like the trend of burying power, communications, and other utilities that were once also overhead, the Forest Park Low Tank demonstrates that water infrastructure can be adapted similarly.

Making the Water Supply Safe

Water is a critical resource in any disaster that disrupts our infrastructure. It’s common knowledge that we cannot survive for more than three days without water. During any natural disaster, it is imperative that our water remain safe and accessible. We completed a site specific seismic hazard (SSSH) as part of our work, so the tank and appurtenant facilities will withstand the next “Big One.”

Defining Ingenuity

Sometimes ingenuity is not devising something new, but applying simple methods to solve a problem. We used performance-based results to guide changes in shoring design, and confirmed landslide mitigation approaches during construction. We avoided designing expensive foundation alternatives, installing bulletproof (and expensive) secant shoring walls, and over-analyzing slope stability prior to construction. And then we buried our best work.

The one thing to remember about this project is that we did not blow our top over an unexpected volcanic vent; instead, we persevered and worked with the design and construction teams to build a successful project…and then buried it out of “site.”Finished project

Preserving Eelgrass While Remediating Legacy Contamination

Eelgrass

What do you do when the State requires you to take action, yet prohibits that action? It’s a conundrum that takes imagination and determination.

The Setup

For over 100 years, several companies used the nearshore at the former Custom Plywood site for processing and manufacturing wood-related materials that would be used nationwide. They filled the tideland with wood, ash, bricks, metal, and sediment. They left a tug, boiler ash, scrap metal, barrels and drums, aluminum cans, scrap wood, paper, sawdust and creosote-treated pilings. As if that wasn’t enough, in 1992 a fire destroyed the mill, adding dioxin (a carcinogen) to the sediment.

The Conundrum

The Washington State Department of Ecology and Hart Crowser removed most of the contamination from the property and tidelands. Despite this, there are many acres of tidelands that are still peripherally contaminated with dioxins, much of which contains healthy eelgrass habitat. The eelgrass is not affected by the dioxin contamination; the problem is that it serves as a potential pathway for human exposure (i.e., shellfish consumption). By State mandate eelgrass must be protected. (See our earlier post about the importance of eelgrass). This means that the State requires that something be done about the contamination but not at the expense of the valuable eelgrass habitat. Our current options for dealing with dioxin contamination are to either dig up the contaminated material, or immobilize/cover it to prevent the exposure to the benthic community. Either action would potentially destroy the eelgrass. What to do?

The New Approach

The solution? Remediate the sediment in place by covering the eelgrass habitat, but not burying it. Eelgrass, unlike other species of seagrass, can only tolerate a very small level of burial. We needed to determine if the eelgrass at the former Custom Plywood site could withstand deposition of very fine layers of sand that would act as a barrier (cap) to the contamination in order to protect the benthic community and the habitat overall. Our team conducted a two-year pilot study to see whether the eelgrass could tolerate a four- or eight-inch layer of sand (applied two inches at a time), rather than a single layer application that would ordinarily be used for remediation. As part of this study, our team also investigated if adding a layer of carbon could increase the cap performance so that the cap could be as thin as possible.

Diver

Diver with eelgrass/sediment sample. Photo courtesy of Research Support Services.

The Result

The data clearly showed that eelgrass at the former Custom Plywood site can survive a four-inch cap if implemented in multiple thin layers. This means that the preferred alternative for cleaning up the residual contamination is potentially feasible. The next step is to design a large scale application using the information and data gathered from the pilot study. Eventually we hope to finally cleanup the former Custom Plywood site while leaving the existing eelgrass habitat in place and functioning.

 

Volunteering with the Children of the Night

Guatemala

Nick Galvin, Hart Crowser environmental scientist, is in Guatemala with his family to volunteer for the Xeroderma Pigmentosum Project.

A bumpy two hours from the nearest “town” of Santa Cruz Barillas, a padlocked chain stretches across the one-lane dirt road. The volunteer team’s diesel Land Cruiser rumbles to a halt. Another Guatemalan road toll. The chain falls and they continue on their way. The small village in the mountainous Huehuetenango department comes into view; the rusting corrugated-steel rooftops of the small village sprawl on the steep mountainsides. The scent of cardamom wafts through the air. Along with maize, cardamom is the local cash-crop.

The volunteer team consists of four. Milo and Dalila, who grew up there and have family in the area, plus Nick Galvin and his wife Bree. Dalila has worked as an un-trained nurse with these families for over fifteen years and Milo is the driver. They serve as translators from Spanish to Canjobal—the native Mayan dialect. Many there know only a few words of Spanish or none at all.

They park on a ridge between two deteriorating wooden school houses. The kids peer between the cracks to get a better look at the two extranjeros (foreigners). They don’t know it yet, but the road to this house will be impassable in two weeks from the incoming rains. From there they walk 15 minutes through hillsides of cardamom, meeting one of the program’s oldest children.

Cardamom fields

Bree en route through the cardamom fields.

At 16 years old, she is hardly a child. But after losing her eyesight and numerous surgeries to remove cancerous growths, she is completely dependent on her family for care. The disease has wracked her body and she suffers daily, but greets the team warmly. Her family’s house consists of two rooms: a smoky cooking area, where an open fire heats a listing metal cooktop surrounded by a couple of plastic chairs; and a sleeping area, where the entire family sleeps on uneven wooden-board beds. The floors are dirt and slope gently with the hillside. There is no electricity, toilet, or running water.

For a little over a month now, the team has been working with several families in this community suffering from Xeroderma pigmentosum or XP. XP is an unimaginably debilitating disease. Those suffering from XP are unable to repair damage from UV-radiation (i.e., the sun). This in turn leads to aggressive skin cancers and extreme photosensitivity, often at a very young age.

XP is an autosomal recessive genetic disease. Think back to freshman-year biology with Punnett Squares and Mendel’s Peas. A person suffering from the condition must have two affected alleles – one from each parent. The inheritance pattern is similar to red hair, blue eyes, or green peas, but with a much more drastic outcome. A person with only one affected allele (a portador, or carrier) can lead a normal life, with no adverse effects.

Punnett Square

Punnett Square showing regular distribution of “regular” (Y) and “affected” (y) alleles and outcome for a recessive trait – green peas. Photo courtesy of Quizlet

The majority of children in Santa Cruz Barillas are not well protected from sun exposure. Often, diagnosis occurs when the child begins to develop hyperpigmentation (darker spots) on the most exposed areas of their body; their face, neck, and arms. Many of these will become skin cancer. Shortly after, if still unprotected, the child will begin to lose his eyesight and exposure to bright light will become extremely painful.

Battling this horrific disease is beyond difficult. The only real “treatment” for those suffering from XP is an early-age diagnosis and vigilant sun protection—avoiding all exposure to sunlight. The only true way to achieve this is to stay indoors in a closed room during all daylight hours. This can have drastic psychological effects. Many houses don’t have electricity or artificial light sources, so this leads to a life sequestered inside, alone and in the dark.

In this village, generations have lived and intermarried, spreading the XP gene throughout the population. However, this is only one reason this disease is so rampant. Many still reject outside aid and chose to believe in archaic explanations; curses, spiritual intervention, or a divine form of punishment. Lack of education about the disease allows these ideas to perpetuate. Some families choose to hide (or worse, abandon) affected children. However, many do not and there is a growing contingent working to eradicate the disease.

Village center

Village center and an omnipresent Land Cruiser shuttle.

In reality, the only true method of prevention is selective reproduction. By knowing who the carriers in the community are, carriers can avoid marrying one another. This slowly dilutes and removes the affected gene from the population. Working with the community, this is a project that their organization has been heavily involved with. Through genetic testing, they have identified the families with the gene and carriers in the village. They have encouraged open communication between the carriers, families, and community, and provided scholarships for carriers to attend college outside of the area. This both elevates the family economically and provides them with an opportunity to find a partner outside of the village. They hope that this information, combined with genetic counselling and education, will allow the village to move closer to eradicating XP from their community.

Other ongoing projects focus on improving the health and quality of life of individuals living with XP. Many of the children have parasitic infections from questionable drinking water sources. Many don’t have sufficient clothing or shoes. All of the children are malnourished. A typical diet consists only of maize tortillas, beans, and the occasional vegetable or fruit. One project the team has spearheaded since they arrived is vegetable gardens. By providing the materials for gardens and classes in fertilizing, composting, and maintenance, they can provide access to a sustainable, healthier diet for the families and children.

Without a doubt, it has been an incredible experience. Staying in the village and working in the families’ homes is a sobering view into their lifestyles and the unimaginable conditions many have to endure. There is an imposing amount of work that could be done to improve the living conditions and quality of life for many of these families. For Nick and his family knowing that they were able to help—even just a small amount—is incredibly rewarding.

Due to the sensitive nature of this disease and the volunteers’ agreement with the community, they could not provide photos of the families or children.

More information about XP

Sources: Up-to-Date, Medscape

Diving In – The Promise of Social Marketing for Storm Water Education

 

Kapalua Bay on Maui

Kapalua Bay on Maui. The West Maui Kumuwai campaign uses social marketing to protect a sensitive watershed.

Individuals have a direct influence on storm water quality in their communities, and regulators strongly emphasize public education and involvement campaigns in municipal storm water management programs. But how can leaders convince residents to pick up after pets, reduce lawn pesticide use, and wash cars without getting soapy water in storm drains? And how can they discourage commercial and industrial workers from dumping contaminated liquids down storm drains behind shops, and to use drip pans to keep oil off pavement? These behavior changes would have a direct positive effect on the coastal and inland water resources we enjoy.

In traditional environmental education campaigns, the message is often delivered through newsletters, brochures, public service announcements, and social media. Some effort may be made to reach a specific audience, but the focus is producing a good quality educational tool. The hope is that having a good message and delivering it well will make people listen, learn and act.

But experience in educational campaign history indicates otherwise. Simply handing someone a pamphlet does not mean that a person will act on that information.

Enter social marketing. Social marketing integrates marketing concepts and tools from social psychology to influence behaviors that benefit individuals and communities for the greater social good.  While social marketing campaigns sometimes employ social media, the two are not the same. Social marketing can use a variety of tools to influence behaviors. First used in the public health realm, the practice focuses on a specific community. Research and surveys identify real or perceived barriers to change, and campaigns are designed to overcome those barriers and reward desired behaviors.

A great example of social marketing in action is the West Maui Kumuwai (WMK) campaign in a sensitive watershed on Maui. WMK is a non-profit that shines a spotlight on the actions of everyday people to promote ocean health. Through community surveys, WMK identified landscaping activities as a community concern relative to storm water pollution. WMK’s Reef-Friendly Landscaper campaign invites landscapers and gardeners to “Take the Pledge” by agreeing to a set of ocean-friendly landscaping activities. WMK then promotes those companies on its website and through social media, to keep these companies engaged and committed.

If you’ve heard of other successful social marketing campaigns related to storm water education, please let us know with a comment.

For more information about storm water services for municipalities, construction, and industry, contact Janice Marsters at janice.marsters@hartcrowser.com.

Anchoring the World’s Longest Floating Bridge

SR520 Bridge

Photo: WSDOT

You’re at the bottom of Lake Washington, 200 feet underwater. It’s flat as a pancake here, but the first 50 feet of soil is diatomaceous silt and clay, which is unspeakably unstable. Think microscopic glass Christmas tree ornaments with the consistency of chocolate mousse. Below that is 50 feet of very-soft clay (zero blowcount, to those in-the-know).

Try, just try, to anchor the new SR 520 Bridge in this chocolate mousse (remember, it’s a floating bridge that can’t be left to drift off to Renton or points unknown). And just for good measure, make each of the 58 anchors able to resist a horizontal load of 600 tons—four times what was needed for the old bridge.

Figure out that you’ll need three types of anchors. In areas along the side slopes, where the water is shallower and has competent soil, use a gravity anchor, but call it a box of rocks amongst your workmates.  Build it like a heavily reinforced concrete egg carton with only four compartments. Joke about the kind of eggs that would fit into a 40 foot by 40 foot by 23 foot carton.  Build them on a barge at the concrete plant in Kenmore at the north end of the lake.  Make them so heavy that that the only derrick large enough to lift one is too big to fit through the Ballard Locks. Tow the gravity anchors through the Ballard locks, though they barely fit, while the public looks on in astonishment.

Gravity anchor

Gravity Anchor on its way to the SR 520 Bridge site. Photo: Kiewit

Flood the 440-ton floating boxes with water to make them sink. Lower them to the lake-bottom and place them on a leveled-out gravel pad. Fill each of them with 1,700 tons of rock to make them heavy enough for lateral frictional resistance, or so they won’t budge.

Don’t stop there. Use a second type of anchor, a drilled shaft, along the shoreline where the lake is shallow enough that the box of rocks would have caused havoc as a navigational hazard. Make them ten feet in diameter and 100 feet tall, not as tall as the original Godzilla, but close enough.

Drilled Shaft

Ten-story-deep drilled shaft anchor. Image: KPFF Consulting Engineers

Then, use fluke anchors, the most technically challenging anchor, for the majority of the project. Make these fluke anchors from reinforced concrete plates three feet by 35 feet wide by 26 feet tall. Cast a steel tetrapod into the side so that the anchor cables can be attached to the I-bar at the end of the tetrapod. Explain that a “tetrapod” is a four-sided shape with triangular faces (not to be confused with a four-limbed vertebrate).

Fluke Anchor

Fluke anchor being jetted into the bottom of Lake Washington. Image: KPFF Consulting Engineers

Place the fluke anchors in a steel frame equipped with water jet tubes to drive them into the mud. Because the mud is chocolate mousse, place mounds of rock above and beside the fluke anchors. And then more rock. And then more rock. Good, that’s enough.

Now, celebrate. The Washington State Department of Transportation’s grand opening of the longest floating bridge in the world will be April 2 and 3, 2016. You can run, bike, or possibly meander across the bridge. Hopefully there will be food. You’re hungry after all that work.

Hart Crowser was the geotechnical engineer-of-record for the anchors for the new SR 520 Bridge. The design-build contractor was a joint venture of Kiewit/General/Manson. The structural engineer was KPFF Consulting Engineers.

Need more detail? Read the technical paper Geotechnical Design: Deep Water Pontoon Mooring Anchors or contact Garry Horvitz, PE, LEG, at garry.horvitz@hartcrowser.com

Fluke anchors on barge

Fluke anchors on barge.