Okaloosa County BOCC — December 18, 2012 — Request for Bids — reading text

centers for Option 1 and 18- inch centers for Option 2. Planting units in each row shall be staggered mid-way (in the shore-parallel direction) between planting units in the adjacent rows. The Contractor may modify the spacing requirements (+/- 4 inches for Option 1 and +/- 6 inches for Option 2) for up to 25% of the plants to achieve a more natural look. Planting units out of compliance with this specification will be planted solely at the Contractor’s risk and will be subject to all of the survival criteria and warranty provisions detailed below in Section 3.6 SUCCESS CRITERIA AND REPLANTING. C. Installation The Contractor shall install planting units by hand labor and tools (e.g., spades, shovels, hand-held augers, etc.). The Contractor shall install planting units to fully cover the planting areas shown in the Drawings. Planting units shall be installed up to existing vegetation, existing structures (e.g., dune walkovers) or access paths. D. Final Dressing The Contractor shall smooth the planting area to remove any large depressions, mounds, or footprints from the finished grade surface. Filling around plants to provide sufficient burial will not be permitted. 3.5 SOIL AMENDMENTS A. Hydrating Gel and Fertilizer The Contractor shall utilize a hydrating gel such as Stockabsorb, Terra-sorb, or similar product with all planting units. The Contractor shall fully hydrate the gel according to the manufacturer’s specifications prior to use. Approximately one-half teaspoon of slow release (90-day) pelletized Osmocote fertilizer, or Engineered-approved substitute, with an N:P:K ratio of 18-6-12, plus trace elements shall be added to the hydrating gel material for each 2-inch planting unit. The amount of fertilizer added to 4-inch planting units shall depend on the plant species and manufacturer’s recommendations. The Contractor shall place a minimum of one-half cup of the hydrated gel/fertilizer mixture at the bottom of the hole beneath the root zone of each planting unit during installation. The plants shall be installed such that the root ball is in contact with the hydrated gel/fertilizer mixture. Dipping the rootball in the hydrating gel/fertilizer mixture prior to installation will not be permitted. The fertilizer shall conform to the applicable State of Florida fertilizer laws. Last Revised – 01/09/2013 Page 62  Fertilizer requirements may vary for the different plant species. The Contractor shall place fertilizer in accordance with standard industry practice for each varying species and size of plant, subject to the approval of the Owner and Engineer. The Contractor’s work plan shall detail the brand name and manufacturer of the proposed hydrating gel and fertilizer and proposed ratios for both 2-inch and 4-inch planting units. The Contractor shall include the cost of the hydrating gel and fertilizer within the installed planting unit bid price. B. Initial and Maintenance Irrigation The Contractor will be allowed to “water in” (initially irrigate) and maintenance-irrigate all newly installed planting units such that the root zone of all newly installed planting units is thoroughly saturated. The irrigation must be performed in accordance with a Contractor-prepared and Engineer-approved irrigation schedule within the submitted watering plan. The watering plan shall detail the proposed number of irrigation events, irrigation methodology, the equipment, water source, labor, required time, notifications, and the physical condition(s) of the planting units which signal the need for maintenance irrigation. The Contractor shall notify the Engineer at least 72 hours prior to the application of initial or maintenance irrigation. The Contractor shall apply irrigation to the planting areas utilizing a non-destructive, non-scouring methodology. The Contractor will be responsible for all aspects of the irrigation, including but not limited to, compliance with all environmental permits, local beach access regulations, and any damages arising from initial or maintenance irrigation. The cost of the initial and/or maintenance irrigation shall be included within the installed planting unit bid price. C. Irrigation Water The Contractor will be responsible for obtaining and applying all irrigation water required. All water shall be fresh and free from injurious amount of oil, acid, alkali salts or other materials harmful to the growth of the plants. The Contractor shall comply with all applicable permits and ordinances. No temporary or piped irrigation systems will be allowed. The Contractor will be responsible for coordinating with local agencies if the use of local hydrants is proposed. D. Maintenance Fertilization The Contractor, if approved by the Engineer, may undertake maintenance fertilizer during the warranty period at their discretion. The Contractor shall notify the Engineer at least 72 hours prior to the application of maintenance fertilizer. The Contractor shall not apply maintenance fertilization within 60 days of the end of the 180-day warranty period. The Contractor shall include the cost of any maintenance fertilization in the unit cost schedule that accompanies the Contractor’s bid documents. The Contractor shall undertake maintenance fertilization, if employed, in a manner that complies with all environmental permits applicable to the project site. E. Vehicle Access Last Revised – 01/09/2013 Page 63  In developing irrigation plans, the Contractor is advised that vehicle access to the beach and in the dune area is restricted and/or prohibited as outlined in Section 2.2.C and Section 7.6. 3.6 SUCCESS CRITERIA AND REPLANTING A. Planting Unit Success Criteria The Engineer will assess the success of the planting effort approximately 180 days after completion of the planting unit installation (for the entire project) using three criteria: whole-site survival rate, planting unit survival pattern, and planting unit root penetration. The Engineer will consider the planting effort a success and acceptable if all three of the described criteria (Criteria 1 – 3 below) are met at the 80% level. The Engineer will assess these criteria across the approximately 1,500 to 2,000-feet acceptance sections documented in the Drawings for the purpose of warranty and payment. B. Whole-Site Survival Rate (Criteria 1) A minimum survival rate of 80% of all planting units installed over the site as a whole shall be achieved. The Engineer will consider plants as surviving if they show clearly vigorous rhizome and white, turgid roots, even in the absence of vital above ground growth. C. Planting Unit Survival Pattern (Criteria 2) A minimum of 80% of the planting width perpendicular to the shoreline shall be occupied by surviving planting units at all locations. This survival criterion is needed to minimize the risk of dune over wash during storm events. The Engineer may waive this success criterion in areas where plant survival has been adversely impacted by unexpected pedestrian traffic, erosion, overwash or inundation. D. Planting Unit Root Penetration (Criteria 3) A minimum of 24 out of 30 (80%) randomly selected plants within each acceptance section shall have achieved root penetration of nine inches or greater, as measured from the top of the root ball down. The Contractor and Engineer, immediately following plant installation, shall tag the 30 randomly selected plants used to determine this measure of success. The Engineer may waive this success criterion if lesser root penetration is otherwise determined to be acceptable or if the lesser penetration was caused by factors outside the control of the Contractor (e.g., excessive natural rainfall). E. Replanting of Units If any of the above success criteria are not met, as determined by the Engineer, the Contractor shall replant the unsuccessful planting units with viable within-specification planting units of the same type originally installed. The Contractor will assume sole responsibility for the replanting of planting units and will complete the replanting at no cost to the Owner. All warranty and survival provisions and requirements will apply to replanted planting units. The Contractor will be responsible for properly disposing of all rejected planting units. F. Initial Planting Unit Survival Last Revised – 01/09/2013 Page 64  The Engineer will reject and not consider eligible for payment all planting units that do not survive for a minimum of 10 days after installation. Within 5 days of notification by the Engineer that an area of initial planting units did not survive for 10 days, the Contractor shall install new, within-specification planting units in areas identified by the Engineer. The Contractor shall assume sole responsibility for installing the new replacement planting units at no cost to the Owner. The Engineer will consider the replacement planting units eligible for payment as “original” planting units only after they have survived a minimum of 10 days after installation. The Contractor will be responsible for properly disposing of all rejected planting units. PART 4 - SAND FENCE and POST & ROPE INSTALLATION 4.1 MATERIALS A. The Drawings specify acceptable sand fencing, post and rope materials. 4.2 INSTALLATION A. The Contractor shall install sand fence along the seaward toe of the existing dune (seaward planting area limit) as shown in the Drawings. Prior to installation, the Contractor shall demonstrate the installation technique to be applied for installing the sand fencing, maintaining proper spacing and attaching the rope. The Contractor, at the discretion of the Engineer, may be allowed to vary sand fence length and/or spacing requirements in transition areas (e.g., areas adjacent to dune walkovers, accesses, etc.). Following sand fencing installation, the Contractor shall attach a single strand of rope to the seaward sand fencing post as shown in the Drawings to create a uniform barrier for the dune area. The rope connection shall be threaded through a hole drilled 3 inches from the top of the post and looped around the post. The rope shall be stapled or nailed on the landward side to inhibit tampering. The Contractor shall allow for uniform sag of approximately 12 inches in the rope between sand fence sections. Where the sand fence terminates at an existing dune walkover, the rope shall be tied and secured to the walkover at an area and elevation