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ATTACHMENT A
<br />GRANT WORK PLAN
<br />Project Title: Egret Marsh Stormwater Park Harvest Rake Replacement
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<br />Project Location: 7295 4TH Street, Vero Beach, Indian River County, Florida 32968. Egret Marsh Stormwater Park
<br />treats water contributed by a 9,000 -acre agricultural drainage basin, a part of the approximately 50,000 acre Indian
<br />River Farms Water Control District, which discharges into the Indian River Lagoon. The Hydrologic Unit Code for
<br />the Indian River Lagoon is 03080203.
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<br />Project Background: This project will replace the existing algae Harvest Rake at Egret Marsh Stormwater Park
<br />(Egret Marsh). Egret Marsh is a regional stormwater treatment facility that uses algae to remove dissolved nitrogen
<br />and phosphorus from water in the Indian River Farms Water Control District's (IRFWCD) Lateral D Canal, serving
<br />an approximate 9,000 acre watershed that discharges into the Indian River Lagoon. Periodically, algae growing on
<br />Egret Marsh's flow way must be harvested to remove captured nutrients from the system and to facilitate growth of
<br />new algae for further nutrient uptake. The harvested algae is collected by the Harvest Rake and deposited onto a
<br />concrete pad for further processing. Since the original Harvest Rake was installed, the manufacturer, Duperon
<br />Corporation, has developed a new Harvest Rake design based on recommendations from County staffs experienced
<br />with the original design. The original Harvest Rake is very prone to clogging due to its rotation - it rotates against the
<br />algae flow into it rather than with it. Because of resultant algae wrapping and clogging, significant staff time is
<br />required to babysit the Harvest Rake during harvest events. The rake frequently becomes clogged and when this
<br />occurs, significant amounts of algae bypass the Harvest Water Basin and flow into the Polishing Pond System. The
<br />cumulative Polishing Pond volume is slowly being compromised by the unnecessary algal flow into it. Duperon's
<br />new Harvest Rake design works with, not against the flow of algae into it, and the new design is expected to
<br />significantly reduce the possibility of clogging. This means that nearly all algae bypass issues will be eliminated,
<br />which will allow the Polishing Ponds to function as intended for a much longer period and also improve the wildlife
<br />habitat potential in and around the ponds due to a lowered pollutant load to them. Because algal removal rates will
<br />increase during harvest events with the implementation of the new Harvest Rake design, the Indian River Lagoon
<br />(IRL) will ultimately benefit since all water treated at Egret Marsh flows into the IRL.
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<br />Project Description: The new Harvest Rake will replace an existing Harvest Rake that to collects harvested algae
<br />from Egret Marsh Stormwater Park's algal turf scrubber. The existing Harvest Rake will be removed from the harvest
<br />tank by a large crane and the new Harvest Rake will be installed in the same location using the same crane. The new
<br />Harvest Rake will be operated using the existing control system.
<br />TASK 1: Procurement of new Harvest Rake by Indian River County.
<br />Deliverable: Color photograph(s) of the Harvest Rake upon delivery.
<br />Timeline for Completion: 6 months from the date the County orders the new Harvest Rake from Duperon
<br />Corporation.
<br />Equipment Cost: $175,000 (DEP Funding)
<br />Performance Standard: The Department's Grant Manager will review the photograph(s) to ensure the Harvest
<br />Rake was purchased and received.
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<br />Revised 6/13
<br />DEP Agreement S0733, Attachment A, Page 1 of 1
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