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Indian River County Page 2 Improvements to 53"rSireet cK Old Dixie Higlrivay Project No, .PSL- 08-2558 (BG 11.4) The following items will also be incorporated into the design of the roadway improvements : + One wet pond is planned between Old Dixie Highway and U .S . Highway 1 at the southern end of the Old Dixie improvements , • Two dry retention areas are planned at the eastern end of the 53 `d Street improvements . • Mast arms will be installed for signalization at the intersections of 53rd Street with Old Dixie Highway, U. S . Highway 1 ,, the Pc blix access Road, and Indian River Boulevard. SCOPE OF STUDY Our geotechnical study will be conducted to characterize the subsoil and groundwater conditions along the roadway alignment, and at the stormwater treatment .and mast aim locations. Our geotechnical work for this project will consist of the following components : Document Review 1 . Review of S . C.S. maps . for native shallow soils types within the project alignment, 2. Review of historical aerial photographs to look .far features and/or tonal reflections that may be indicative of pits, ponds, sloughs and other such areas considered to be geotechnical concerns. The review will .also attempt to identify the sequencing of the ununproved roadway and lake formation . Field Exploration Roadwgy Soil Survey 1 . Exploration of the shallow subsurface conditions along the roadway alignment with soil borings using a truck-mounted drilling rig or hand-turned augeiing equipment . We will perform 6 foot deep auger borings at about 200400t centers along the roadway following an alternating roadside pattern. 2. In the stretch of unimproved roadway between the two :lakes, the auger borings will be substituted with 204bot deep Standard Penetration Test (SPT) borings drilled at approximately 1.00400t centers. The SPT borings provide more detailed data on soil composition and, density, mid also allow for-assessment of voids through drilling fluid return. 3 . Ground Penetrating Radar (CrPR)' survey of the unimproved roadway between the I akes may be utilized to fiirther assess the existing embankment fill, depending on the SPT boring findings. 4. Excavation of test pits into the existing embankment fill may be utilized to further assess the existing embankment fill, depending on the finding of the SPT borings: Dunkelberger