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from a passive-use county park to the south . Although less than the established 350-ft program optimum, <br /> these setbacks provide adequate separation, given the intended uses of the adjacent properties . <br /> Third , basin construction must minimally impact sensitive on -site habitats, most notably the wetlands <br /> that comprise most of the site ' s eastern one-half. As shown in Figure 2 .2, the containment dike ' s outside toe <br /> lies a minimum of 50 ft from the nearest wetland edge along the basin ' s eastern side and at its northeast <br /> corner. However, establishing a similar setback was impossible in the central portion of the basin ' s western <br /> side where construction will impact up to 0. 10 acres of disturbed wetland . Classified as a mixed <br /> wetland/Brazilian pepper community, this former hammock area now qualifies as predominantly wetland, <br /> based on hydric soils and periodic standing water. However, the dominant vegetation does not support this <br /> classification as previous clearing has promoted a dense regrowth of Brazilian pepper. Within the disturbed <br /> wetland, a formal wetland delineation would likely classify some isolated areas as upland. Avoiding this area <br /> and providing an appropriate dike setback would unduly constrain the basin ' s total area. Notably, the <br /> extensive mangrove impoundments within the site' s eastern one- half offer ample opportunity for on- site <br /> mitigation . <br /> Fourth , because of low upland elevations, the likelihood of a seasonally high water table, and the <br /> possibility of a shallow limestone strata in portions of the site, basin construction must minimize the <br /> excavation depth necessary to obtain the required dike material . Qualitative information presented in the <br /> county soil survey (Wettstein et al . , 1987) provides the only available data describing soil and groundwater <br /> conditions on site. Native soils include ( in order of decreasing areal coverage) McKee mucky clay loam , <br /> Riomar clay loam , Jupiter fine sand, Chobee loamy fine sand, and Perrin Variant loamy fine sand . <br /> Characteristic of mangrove islands and swamps and thus confined to the wetlands within the site' s eastern <br /> one-half, the McKee mucky clay loam and the Riomar clay loam soils avoid all construction impacts. The <br /> site 's western one-half, predominantly upland and includingthose areas historically planted in citrus, contain <br /> the remaining three soil associations . Typical of low, broad flats, depressions, or poorly-defined drainways, <br /> all three upland soils are characterized as nearly level and poorly- drained to very poorly-drained . All three <br /> soils typically maintain a water table within 10 in. of the soil surface from four to more than six months each <br /> year. Because of the poorly-drained conditions, these soils become suitable for citrus production only if a <br /> water control system (e . g., ditching and bedding) maintains the water table at a depth of 4 ft or greater. Relic <br /> evidence of such water control methods remains in portions of the former grove areas of Site 1R- 14 . Notably, <br /> 7 <br />