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<br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br />) <br /> <br />DANIEL SPECTOR, P,G" LEP <br /> <br />Duo Hallandale RAR, Hallandale, Florida - Mr. Spector managed a reasonable assurance investigation at a residential devel- <br />opment as part of the permit process for stormwater drainage wells. Mr. Spector designed the investigation, which included <br />logging a 97-ft-deep test hole using geophysical techniques (induction conductivity, neutron, and gamma-gamma). His evalua- <br />tion of the geophysical data and of geotechnical data from a nearby site indicated that reasonable assurance would be satis- <br />fied below 94 ft bls. The well driller indicated that production was poor below 100 ft bls. Mr, Spector recommended collecting <br />additional water quality data (total dissolved solids and chloride) above 100 ft bls to correlate with the geophysical data. The <br />additional data allowed Langan to recommend a shallower minimum casing depth for stormwater drainage wells. FDEP ap- <br />proved the minimum casing depth of 80 ft bls, which allowed the well driller to take advantage of the capacity of the interval be- <br />tween 80 ft bls andJ OOJt.bls, <br /> <br />Construction Dewatering Design and Groundwater Monitoring, Miami Beach, Florida - Mr. Spector helped manage the de- <br />sign, permitting and groundwater monitoring for a large construction project at the historic Fontainebleau Hotel on Miami <br />Beach. Langan had identified a plume of contaminated ground water under the building, and the client asked Langan to design <br />and permit a dewatering plan that would allow construction to proceed without causing the plume to migrate into the excava- <br />tions. The project required extensive groundwater monitoring and regulatory agency interaction. <br /> <br />Temporary Drill Shaft Permitting for Construction Dewatering, Miami, Florida - A developer of a high-rise condominium in down- <br />town Miami needed to dewater a large excavation during several weeks of construction. The expected volume of groundwater ex- <br />ceeded the capacity of the municipal storm sewer. Because contaminated sites were identified within one-quarter mile of the <br />project site, Mr. Spector worked with Langan's groundwater modelers to demonstrate that, based on conservative assumptions of <br />aquifer properties, the radius of influence of the dewatering would not draw offsite contaminants onto the project site. Mr. Spector <br />worked with the UIC section of FDEP and gained approval for the developer to use a 140-ft drill shaft as a temporary construction <br />dewatering well. Mr, Spector's working relationship with the UIC section resulted in FDEP approval of the project in three weeks, <br />which resulted in substantial savings in cost and time for the developer. <br /> <br />Hydrogeological Services, City of Sunny Isles Beach, Florida - Mr, Spector managed the investigation of the hydrogeology <br />and water quality in Sunny Isles Beach to support the redesign of the city's stormwater drainage system. The investigation in- <br />cluded three test holes to 100 ft, analysis of geological samples, field measurement of total dissolved solids, and step- <br />drawdown specific capacity tests in carbonate sand and coralline limestone. The investigation concluded that the city's civil <br />engineer could design the deep injection wells with capacities ranging from 400 gallons per minute per foot of drawdown <br />(gpm/ft) to 700 gpm/ft. <br /> <br />Reasonable Assurance Investigation and Infiltration Rate Investigation, Hollywood, Florida - Mr. Spector managed the rea- <br />sonable assurance investigation as part of the permit process for stormwater drainage wells at a 1 O-acre residential develop- <br />ment. The investigation determined that the conditions for reasonable assurance - a semiconfining layer, and a 8-111 aquifer- <br />were not present until 21 0 ft below land surface (bls). The UIC Section of the FDEP approved a minimum well casing depth of <br />210ft, but the lack of a good production zone and the presence of running sand led to the conclusion that deep injection was <br />not feasible. At Langan's suggestion, the owner redesigned the development plans to include subsurface storage of stormwa- <br />ter runoff. The owner asked Langan to evaluate the shallow infiltration rate to determine whether the expected volume of runoff <br />would infiltrate within 72 hrs of a storm event, per county regulations. Mr. Spector recommended and designed infiltration tests <br />using a double-ring infiltrometer, which demonstrated that the infiltration rate of the vadose-zone soil exceeded the design infil- <br />tration rate for the subsurface storage area, <br /> <br />Page 3127 <br />