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Indian River County Public Works Department Proposed North County Regional Part: June 15 , 2000 the footing grade should be a minimum of 95 % density. If the bottom of the footing has been ' loosened during excavation, the footing area should be compacted with a heavy plate vibratory compactor. Sufficient compactive effort should be applied to achieve the 95 % density. ' Pool Decks The earth walls of the pool excavation usually extend out a few feet from the pool walls into the deck area. It is essential the entire depth of the backfill placed in this area is compacted to 95 % density per ASTM D- 1557 . Groundxlater Heavy rainfall and/or a high water table may occur before the earthwork commences, or during the iearthwork operation. When these conditions occur and the site preparation cannot be achieved as specified. an evaluation of the existing conditions should be conducted and the specifications revised accordingly. On-Site Inspection We recommend that the site preparation and subsequent earthwork be monitored by a qualified soils technician. The soils technician should be responsible to observe the compaction of the building and pavement areas, determine the suitability of the fill and backfill, and take representative density tests on the prepared surface, fill, backfill, and footing excavations. PAVEMENT AREA PREPARATION RECOMMENDATIONS Pavement Area Preparation and Earthwork The pavement areas should be cleared of all trees, roots, surface vegetation, and any other deleterious matter to 3 feet outside of the proposed paved areas. After clearing, the area should be graded to an even grade and then compacted with a self-propelled steel drum vibratory roller having a minimum total applied force of 10 tons . Sufficient compactive effort should be applied to obtain a minimum ' of 95 % density per ASTM D- 1557 for a depth of 2 feet . The vibratory roller should make a minimum of 6 overlapping passes, 3 in one direction, and 3 in a direction at right angles over the ' entire cleared area. Soil density tests should be taken in the upper 2 feet prior to fill placement . If any unstable soil conditions or soft areas are encountered during compaction operations, the project engineer, geotechnical consultant or other responsible professional should be informed, the matter ' investigated and a resolution determined. ' 4 Fraser Engineering and Testing, Inc .