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GROUNDWATER GRADIENT <br /> s <br /> The objective of this task is to determine the direction and <br /> J gradient of the <br /> water table. This task will be accomplished by detailed measurement of the <br /> groundwater table on two separate occasions after the water levels have stabi- <br /> lized. In addition, we will obtain any available -water level data from adjacent <br /> :1 sites in order to gain further control on the groundwater contours. Water <br /> levels will be obtained from at least the following wells: <br /> o All observation wells to be installed during this program; <br /> o MW-1, installed by Kennedy/Jenks/Chilton in Oak Court (Plate 2); <br /> o The three remaining wells at the Renown Enterprises Tennis Villa site <br /> to the east of the Alden Park area, if accessible. <br /> s. Oil thickness (if present) and water levels will be measured to the 0.01 foot <br /> #� usinga Marine Moisture Control (MMC) electronic interface <br /> probe. These <br /> measurements will be checked in each well at the same time using gasoline and <br /> water indicator pastes. Direct observation of the thickness of floating product <br /> will also be attempted using a clear acrylic bailer. If free oil is present, a <br /> correction will be made for the buoyant effects of a column of oil resting on a <br /> column of water. Water level data will be used to construct a groundwater table <br /> contour map for the site vicinity. <br /> RESIDENTIAL OIL AND GREASE SAMPLES <br /> Although not required by the RW CB we include abri € description of work <br /> to be performed under this task. The objective of this task is to identify <br /> whether residential properties in the vicinity of Alden Park are underlain by <br /> oily soils. To accomplish this objective, we propose to follow a drilling, <br /> sampling and analytical program as described in the following sections. <br /> Drilling and Sampling <br /> Borings would be advanced in approximately 100 residential backyards using a <br /> modification of the technique described in the Probing Program, by our sub- <br /> contractor, HanDriven Sampling Company, under the supervision of-a Dames & Moore <br /> 4� <br /> Y JED2/H -13- <br />