the PREMIUM WATER APPLICATION P E T R A T E C H

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1 the PREMIUM WATER APPLICATION E A R T H D A M S S H O R E L I N E S L O C A L S C O U R C O N S T R I C T I O N S C O U R C A N A L S C H A N N E L S W A T E R C O N T R O L S P I L L W A Y S R I V E R S & S T R E A M S D I K E S & L E V E E S B O A T L A U N C H G O L F C O U R S E S P E T R A T E C H

2 P E T R A T E C H Our products G E O L I N K P E T R A F L E X OUR VIEW To our customers and the people of our operating communities: Since 1978, Petratech has been managing hard armor water and land protection products. We plan to remain in this business for the long term. Our future success is tied to the health of the natural environment and the resources on which we depend. This is one of the reasons environmental responsibility is a day to day part of our business. This brochure provides an overview of how we approach the environmental responsibilities that are integral to our business. We manage our process and focus on efficient and clean design applications. We prevent pollution by applying products that combat erosion and promote natural vegetation that filters impurities from our waterways. We hope this brochure will prove our commitment to these responsibilities, every day, in everything we do. Geolink is a perfect solution to the imperfect problem of soil erosion.

3 Geolink s premium design inhibits the transport of soil during the erosion process and helps keep our waterways free from silt and hazardous pollutants. Open cells within the block support and maintain vegetative growth enhancing water CONTENTS quality through a natural cleansing process by t h e B E N E F I T S Page THREE W A T E R Soil transported by water as a result of erosion is the leading cause of pollution to our waterways. Q U A L I T Y filtering out contaminants. Geolink s superior methods of erosion control prevention promotes a natural and aesthetically pleasing environment. The Geolink units are designed to create positive unit-to-unit interlock. This enables the installation to act as a system rather than a series of individual units, providing a greater factor of safety and superior performance. The solid performance of Geolink has been supported through rigorous testing at the University of Minnesota s St. Anthony Falls Laboratory. Geolink s hydraulic capacity makes it an ideal choice for even the most challenging sites. High strength, hand placed, concrete units over a properly prepared foundation, virtually eliminates the need for heavy equipment. Thus, making Geolink an ideal solution for hard to get to sites. The use of smaller equipment during construction reduces disturbances on-site and in adjacent areas. Petratech is a company committed to providing premium site solutions. Our experienced field personnel are available to assist you with every step of your project from start to finish. Our in-house engineering staff is available to provide technical assistance from preliminary drawings and CADD details to final design. Let us help you with your storm water management needs. Water Quality and Soil Erosion t h e D E S I G N Page FOUR Our Design Philosophy Design and Research o u r P R O C E S S Page SIX Geolink Installation Placement Techniques o u r P R O D U C T Page EIGHT Completed Project

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5 t h e B E N E F I T S WATER QUALITY Soil erosion has been an issue plaguing engineers for AND SOIL EROSION decades. It is a well-known fact that the single biggest impact on water quality is a direct result of the soil erosion process. As a result of new federal and local regulations mandating the control of silt runoff, the engineering community must now use innovative measures to control the erosion process. When flow velocities and shear stresses exceed the limits of natural vegetation, protective measures need to be implemented to prevent erosion. Historically, riprap and concrete paving have been used to control this process. These solutions unfortunately, do not support vegetation, which is a natural filter. Moreover, they create greater runoff volumes, which increasingly contribute to flooding. Over the past several years, a variety of innovative products have been developed offering significant advantages over traditional methods of controlling erosion. Geolink provides the benefits of conventional methods yet offers the additional benefits of: supporting vegetation P a g e T H R E E facilitating groundwater recharge reducing runoff velocities and volumes enhancing water quality The Performance Pyramid represents solutions to erosion control as flow velocities and shear stresses increase. Articulated concrete units (Geolink) offer the highest level of performance and erosion protection and still have the ability to support vegetative growth. Once the hydraulic requirements exceed the capacity of articulated concrete blocks, hard armor solutions are required, and no longer support vegetative growth and water quality. HARD ARMOR CONCRETE PAVING P E R F O R M A N C E P Y R A M I D CONCRETE PAVING does not support vegetation ARTICULATED CONCRETE BLOCKS supports vegetative growth TIER ONE limits of natural vegetation

6 t h e D E S I G N A well-balanced, properly designed revetment system is OUR DESIGN PHILOSOPHY mandatory to ensure that your project will serve its intended purpose. The primary design considerations for typical applications are the hydraulic capabilities of the product as compared to the hydraulic requirements of the project. Also, drainage, separation, foundation and anchorage issues need to be considered and addressed during the design process. G E O L I N K Unit Specifications product number height width length gross coverage per ft 2 weight weight per sq ft open area % PL PL DESIGN PLATFORM Geolink units with vegetation soil filled units engineering fabric layer drainage media (optional) prepared subgrade foundation APPLICATION GRASSY PAVER Geolink has the ability to be used as a grassy paver. This aesthetically pleasing look will withstand heavy equipment.

7 Elevations (ft) RESEARCH Full scale laboratory testing has been conducted on Geolink to determine its & DESIGN limiting shear stress and maximum velocity. These results can be compared to the actual shear stress and velocity requirements with an appropriate factor of safety for each specific site. The Geolink units are to be placed on a properly designed foundation. Depending on the site logistics and the soil type involved, global stability should be evaluated. The foundation must be stable and designed to prevent excessive and differential settlement. A drainage media may need to be incorporated into the design depending on the porosity of the foundation soils in order to prevent uplift of the Geolink units. An engineering fabric is always required at the base of the units to prevent the loss of foundation soils during hydraulic events. If an open graded rock is used for drainage, an engineering fabric should be used between the subgrade and the drainage system to prevent clogging. The engineering fabric needs to be designed to prevent the loss of soil fines under various hydraulic conditions and dissipate excessive pore pressure. The revetment system should be entrenched at the edges and toe of the system to prevent scour. GRAPH of LABORATORY TEST** 3' Overtopping Flow - Discharge of 144 cfs. Block Surface Water Surface Mean Velocity Mean Velocity (fps) University of Minnesota, hydraulic analysis performed in P a g e F I V E Distance along Test Section (ft) CHANNEL CROSS SECTION buried units for stabilization vegetation water level units fabric *Published design values were derived from Geolink tested with a drainage media in place.

8 o u r P R O C E S S INSTALLATION The installation procedure for Geolink is quite simple, however, OF GEOLINK proper techniques must be followed to ensure the system s long-term performance. Prepare the site for installation by creating a smooth soil base, free of debris and rock. This will ensure contact between the base of the Geolink unit and the foundation. An approved geotextile fabric should be placed directly on the prepared foundation free of wrinkles. In some cases, "U" shaped staples may be required to hold the fabric in place. The centerline of the system should be established and marked to ensure proper alignment of the Geolink units. Begin placing units parallel along the marked centerline. There is little flexibility of units side to side, therefore, making them unable to be laid on a radius. If the soil grade is greater than 4:1, it is best to begin placing units at the toe of the slope. Each edge of the system must be entrenched as detailed on the plans, to prevent the migration of water and keep the system from sliding. Depending on the geometric layout of the site, additional anchors may be required. Finally, if vegetation is desired, the system should be soil filled. Note: Additional steps may be required depending on project specifications. P a g e S I X INSTALLATION START Base Preparation Prepare a smooth foundation to the proper geometric of the site. Geotextile Installation Place the geotextile fabric on a prepared base surface. Geolink Unit Placement Start at the centerline and work outward by interlocking the units together.

9 Placement Sequence = { C L } Centerlines INSTALLATION Use a string line to establish the TECHNIQUES centerline of the channel. Place the units along the centerline, however, it is not recommended to place more than twelve units longitudinally before moving outward. To accommodate horizontal curves, place the units as shown in figures one and two (figure one applies to a compact radius ; figure two applies to a gradual radius). From time to time, units may need to be field cut in order to provide a proper fit along the miter. The areas directly adjacent to the miter must be field grouted to tie the two sections together. Figure one: Compact Radius Figure two: Gradual Radius P a g e S E V E N INSTALLATION COMPLETION Additional Units Placed Continue unit placement by working towards the edge of the site. Covering units with soil will promote vegetative growth. Notes for Installation Keep units parallel to centerline. Units cannot negotiate horizontal curves by manipulating unit-to-unit contact. V egetative Growth Factor Geolink is designed with a 20% open area. This allows vegetation to establish and act as a natural filter.

10 o u r P R O D U C T

11 OUR PLAN Petratech is a subsidiary of Keystone Retaining Walls and CONTECH Construction Products Inc. Like Keystone and CONTECH, Petratech is committed to providing the construction industry with innovative site solutions. In order for us to keep the leading edge, our goals center on continued product improvements and new product development. Our company is committed to providing the best quality products and services. Quality control programs and procedures are strictly enforced. As a result, site problems are drastically reduced. Petratech conducts regular training sessions to ensure that our employees are the most qualified representatives in the industry. We regularly attend trade shows and independent continuing education programs. We listen to our customer s needs and work to resolve their issues. You can rest assured that everyone at Petratech is looking for new ways and products Petraflex is another erosion control product offered by Petratech. to address the water quality issues we are faced with today.

12 P E T R A T E C H 4444 West 78th Street Minneapolis MN fax