Laserfiche WebLink
TABLE 1 <br /> APPARENT FREE-PHASE PRODUCT THICKNESS <br /> 1766 MONTE DIABLO, STOCKTON, CALIFORNIA <br /> DATE DTP DTW APT <br /> August 16, 1993 21.64 24.98 3.34 <br /> August 19, 1993 21.87 21.96 0.09 <br /> September 2, 1993 21.84 21.94 0.10 <br /> All measurements given in feet <br /> DTP - Depth to Product <br /> DTW - Depth to Water <br /> APT = Apparent Product Thickness <br /> Following the removal of approximately 20 gal of liquid (5 to 6 gal of product) from the well <br /> during a period of approximately 75 minutes, the depth to water was recorded at 28.45 ft (�4 ft <br /> of drawdown). Recharge rate was calculated to be approximately 0.27 ft/min or approximately <br /> 0.43 gal/minute. A bailer lowered slowly through the air/water interface after the static water <br /> level had recovered to ?90% indicated the presence of approximately 0.2 in of free-phase product <br /> remaining on the surface of the water. <br /> TEST II <br /> WALSH returned to the site on August 19, 1993 to conduct a second bail down test. Depth to <br /> product was measured at 21.87 ft below the top of the well casing, while depth to water was <br /> measured at 21.96 ft (Table 1). The apparent product thickness was 0.09 ft or 1.1 inches. <br /> Retrieval of the first bailer indicated the presence of approximately 0.20 in of free-phase product <br /> floating on the groundwater surface. After withdrawing approximately 5 gal of liquid from the <br /> well, depth to water was 25.74 ft (N3.8 ft of drawdown). Recharge rate was calculated at 0.31 <br /> ft/min or approximately 0.5 gal/minute. Three additional gallons were removed from the well <br /> and no floating product was observed in any of the twelve columns of water. <br /> TEST III <br /> Two weeks late on September 2, 1993, WALSH returned to the site a third time to perform a <br /> visual inspection and final bail down test. Depth to product was measured at 21.84 ft below the <br /> top of the well casing, while depth to water was 21.94 ft (Table 1). The apparent product <br /> thickness was 0.10 ft or 1.2 inches. Retrieval of the first bailer indicated the presence of <br /> approximately 0.19 in of free-phase product floating on the groundwater surface. Approximately <br /> 10 to 11 gal of liquid was removed from the well during a period of 23 minutes. The water level <br /> at that time was 27.86 ft (;z�6.2 ft of drawdown). The recharge rate was calculated at 0.33 ft/min <br /> XV 9117193 1685-020.prr <br /> . 2>.,.. <br /> & Associatt� , ]nc. <br /> F,i1Vir4n113Cntad scientists and F.ngrincers <br />