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Data from U.S. Geological Survey Water-Resources Investigations Report 03-4208

Drilling, Well Completion, Core Analysis, and Geophysical Logging Nearly all of the 50 test coreholes were drilled following GPR data acquisition (table 1 and fig. 2). Test coreholes were located along the GPR profile tracts where they would be most useful for verification of GPR attributes. Collection of continuous 3.4- or 4-in. diameter cores was preferred to the normal rotary method, which produces small cutting samples collected over relatively wide depth intervals. The test coreholes were drilled by either Amdrill Inc., employing a wireline coring method, or by U.S. Drilling Inc., using a conventional coring method (table 1). Borehole geophysical logs were collected by the USGS in 45 of the 50 test coreholes drilled during this study and included induction resistivity, natural gamma ray, spontaneous potential, single-point resistivity, caliper, and digital borehole image logs (app. I). Borehole geophysical logs were not collected at the G-3694 and G-3697 test coreholes (fig. 2) due to problems with locating the well or destruction of the well after drilling. The borehole geophysical-logging tools were run in boreholes filled with clear freshwater. Each borehole was cased with 3.5- or 5-in. solid polyvinyl chlorinated (PVC) surface casing set to a depth between 4 and 19 ft below land surface (app. I). Data were acquired in digital format and archived in the USGS National Water Information System (NWIS) database. The digital borehole image logs were acquired using an RaaX BIPS digital optical logging tool. A Mount Sopris Model HFP-2293 heat-pulse flowmeter was used to assess borehole fluid movement in the G-3710 test corehole. A technique described by Paillet (2000) to estimate vertical groundwater borehole flow was utilized with the flowmeter measurements collected in the G-3710 test corehole. This method has been previously applied to southern Florida aquifers (Paillet and Reese, 2000). Most geophysical logs collected as part of this study are provided in appendix I. Core samples were described using a 10-power hand lens and binocular microscope to determine vertical patterns of microfacies, sedimentary structures, and lithostratigraphic boundaries, to characterize porosity, and to estimate “relative” permeability. Limestones were classified by combining the schemes of Dunham (1962), Embry and Klovan (1971), and Lucia (1995). The rock color of dry core samples was recorded by comparison to a Munsell rock-color chart (Geological Society of America, 1991). Core-sample descriptions were classified as rock-fabric facies and are presented graphically in appendix I and on plates 1 to 5. Horizontal and vertical permeability of 71 whole-core samples, horizontal permeability of 36 core-plug samples, and porosity and grain density of all 107 samples were measured at Core Laboratories, Inc. (app. II). At the time of this writing (2003), all continuous cores collected in this study were archived at the USGS office in Miami. Numerous (318) core-sample thin sections were examined using standard transmitted- light petrography to characterize and interpret rock properties and small-scale porosity.
Map showing location of test corehole location and number. [larger version]

Table 1. List of all test coreholes drilled during this study

[Well locations are shown in figure 2; all wells are located in Miami-Dade County, Florida; Wells G-3671 to G-3697 were drilled by Amdrill, Inc., using wireline-core drilling method and 3.5-inch solid polyvinyl chloride construction material, unless otherwise noted. Wells G-3710 to 3734 were drilled by U.S. Drilling, Inc., using conventional-core drilling method and 5.5-inch solid polyvinyl chloride construction material, unless otherwise noted. Latitudes and longitudes referenced to North American Datum of 1983. Altitude of measuring point is land surface referenced to the National Geodetic Vertical Datum of 1929 (NGVD of 1929); NA, not available]
Local  well
identifier 		USGS site
identification number 		Land net location Latitude Longitude Altitude of measuring
point 		Total depth drilled
(feet) 		Depth of  
bottom of casing (feet) 		End date of construction
G-3671 254456080295301 SESE SEC11 T54S R38E 254456 802953 12 150 NA 8-7-98
G-3672   254822080290201 SENE SEC25 T53S R38E 254822 802902 20 45 18 8-8-98
G-3673 254822080290202 SENE SEC25 T53S R38E 254822 802902 20 160 18 8-10-98
G-3674 255529080251101 NWNW SEC14 T52S R39E   255529 802511  8 160 NA 8-16-98
G-3675 255723080261301 SESNE SEC27 T50S R39E 255723 802613 8 90 NA 8-21-98
G-3678 254050080295401 NW SEC1 T55S R38E 254050 802954 12 35 10 5-22-99
G-3679 254129080294301 SE SEC35 T54S R38E 254129 802943 10.5 40 10 5-23-99
G-3680   254252080294601 NW SEC25 T54S R38E 254252   802946 11 40 10 5-23-99
G-3681 254349080294901 NW SEC24 T54S R38E 254349 802949 9.5 45 10 5-23-99
G-3682   253937080295001 SWNW SEC12 T55S R38E 253937 802950 13.5 30 10 5-24-99
G-3683 253940080282601 SENE SEC7 T55S R39E 253940 802826 12 35 10 5-24-99
G-3684   253943080272201  SE SEC8 T55S R39E 253943 802722 11.5 35 10 5-24-99
G-3685 254543080305501 SE SEC3 T54S R38E 254543 803055 14 30 10 5-25-99
G-3686   254541080294301 SW SEC1 T54S R38E 254541 802943 11 30   10 5-25-99
G-3687 254542080284401 SW SEC6 T54S R39E 254542 802844 12.5 30 10 5-25-99
G-3688 254542080270001 SE SEC5 T54S R39E 254542 802700 9.5 30 10 5-26-99
G-3689 254542080259001 SE SEC3 T54S R39E 254542 802590 9 30 10 5-26-99
G-3690 254635080285801 SE SEC1 T54S R38E 254635 802858 11.5 30 10 5-26-99
G-3691 254542080315301 SE SEC4 T54S R38E 254542 803153 14 35 10 5-27-99
G-3692   254541080260001 SE SEC4 T54S R39E 254541 802600 9 30 NA 5-27-99
G-3693 254224080284701 SE SEC25 T54S R38E 254224 802847 11.5 35 NA 6-2-99
G-3694   254336080284401 NWNW SEC19 T54S R39E 254336 802844 11 35 10 6-2-99
G-3695 254339080272401 NW SEC20 T54S R39E 254339 802724 10.5 35 10 6-3-99
G-3696   254341080261101 NW SEC21 T54S R39E 254341 802611 11 35 10 6-3-99
G-3697 254429080265401 NENE SEC17 T54S R39E 254429 802654 9 30 NA 6-3-99
G-3710   254310080284801 SESE SEC24 T54S R38E 254310 802848 10 33 8 4-20-00
G-3711 254300080284701 SESE SEC24 T54S R38E 254300 802847 10 37 8 4-20-00
G-3712   254250080284601 SESE SEC24 T54S R38E 254250 802846 10 28 7 5-1-00
G-3713 254245080284501 SESE SEC24 T54S R38E 254245 802845 10 32.5 7 5-2-00
G-3714   253937080292901 SENW SEC12 T55S R38E 253937 802929 13 23 8 5-3-00
G-3715 253938080292301 SENW SEC12 T55S R38E 253938 802923 13 23 8 5-3-00
G-3716 253943080272301 SE SEC8 T55S R39E 253943 802723 9 28 8 5-4-00
G-3717 255039080290101 SESE SEC12 T53S R38E 255039 802901 9 43 7.75 5-8-00
G-3718   255220080290301 SESE SEC36 T52S R38E 255220 802903 9 30 6.3 5-9-00
G-3719 255355080284301 NENW SEC30 T52S R39E 255355 802843 9 30 6.5 5-10-00
G-3720   255530080271301 NWNW SEC16 T52S R39E 255530 802713 9 31 5 5-11-00
G-3721 255424080271201 NESE SEC20 T52S R39E 255424 802712 10 30 9 5-12-00
G-3722   255326080270901 NESE SEC29 T52S R39E 255326 802709 10 32 7.75 5-12-00
G-3723 255328080251201 NESE SEC27 T52S R39E 255328 802512 8 45 7 5-15-00
G-3724   254942080285801 NENE SEC24 T53S R38E 254942 802858 9 30 7 5-16-00
G-3725 254655080231201 NENE SEC1 T53S R39E 254655 802312 6 31.5 6.5 5-17-00
G-3726 254825080231201 NENE SEC25 T53S R39E  254825 802312 7 33 10 5-18-00
G-3727 255033080231301 SWSW SEC7 T53S R40E
255033
802313
9
43
8.5
5-30-00
G-3728   255154080231301 NWNW SEC6 T53S R40E
255154
802313
8
38
6
5-31-00
G-3729 254843080261101 SWSESE SEC21 T53S R39E
254843
802611
6
36
6
6-1-00
G-3730 254842080250801 SESESE SEC22 T53S R39E
254842  
802508
6
40
7
6-2-00
G-3731 255408080231801 NWSWSW SEC19 T52S R40E
255408
802318
11
43
7.5
6-5-00
G-3732 255724080235401 NENENW SEC01 T52S R39E
255724
802354
7  
48
5
8-21-00
G-3733 255724080213401 NWNWNW SEC04 T52S R40E
255724
802134
5
43
7
9-8-00
G-3734 255540080222501 NWNENE SEC18 T52S R40E
255540
802225
8
33
7
9-8-00


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