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Addendum # 13 3/22/2007 Page 2 of 7 4. Existing Stormwater Structure Evaluation: Using as-built information recently provided by the County, we will evaluate existing stormwater management pipes on the North County Regional Park and Sebastian Middle School sites. The original stormwater report for the CR 512 project proposed culverts for the Pond B discharge and outfall to a then existing drainage ditch. The completion of the North County Park site directly north of Pond B piped a portion of said ditch including the point at which Pond B' s outfall was to connect. Since the size and length of North County Park project pipes as constructed differ from that included in the original model, we will revise the model to include the as-built pipe data. The model will then be run to determine whether the existing structures will accommodate the discharge flows from CR-512 's Pond B, the North County Regional Park and the Sebastian Middle School. As part of this task we will discuss the model results with the County Engineer and make recommendations for any required remedial design. We propose to perform the Scope of Services outlined under Task A for the following lump sum fee : $ 22,515.00 Task B — Threatened and Endaneered Species Survey and Wetland Functional Analysis An environmental assessment was performed for the entire CR-512 Roadway Improvements project in 1998 by our Sub-consultant, Environmental Services, Inc. (ESI). Since that time, the Phase IV alignment has been revised to the south of the existing roadway and will pass through and adjacent to environmentally sensitive areas. In order to address environmental concerns prior to the commencement of construction the County has requested that an updated Threatened and Endangered Species Survey and Wetland Functional Analysis be conducted. We shall provide the following scope of services under this task: 1 . Threatened and Endangered Species Survey ESI will conduct pedestrian transects through the various vegetative habitats within the proposed roadway expansion corridor and stormwater management ponds A, B and C pursuant to the methodologies of the Florida Fish and Wildlife Conservation Commission (FFWCC), to observe evidence of any local state or federally protected plant or animal species, specifically any evidence of gopher tortoise (Gopherus polyphemus). A brief letter report will document the results of the survey. Note: The limits of the roadway corridor and stormwater management ponds A, B and C will be staked in the field by others prior to the commencement of the surveys. This task only assumes one ( 1 ) survey for gopher tortoise. If the survey is conducted more than 90 days before land disturbance, an updated survey will be required and is not part of this proposal. ESI will map the locations and status of gopher tortoise burrows to determine the extent of the on-site gopher tortoise population. If observed, ESI will hang flags on the vegetation adjacent to a burrow and a map will be prepared indicating the location of the burrow. This task does not include any gopher tortoise permitting.