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Zone 7 Water Agency – Tennis Park Test Well Summary <br />and Production Well Design Recommendations <br /> <br /> <br /> 2 Zone 7 Water Agency <br />December 2025 <br /> <br />encountered in the test hole. The lithology encountered in the test hole and the geophysical logs are <br />detailed on the attached test well as-built profile (Figure 3). Multiple coarse-grained intervals were <br />identified in the borehole that could be targeted in a future production well between 195 feet and <br />760 feet bgs. Coarse-grained intervals above 195 feet bgs were not considered potential target zones in a <br />new well due to anticipated poor water quality. <br />LSCE submitted a preliminary test well profile (Figure 3) to Zone 7 for approval. The test well design <br />included multiple intermediate bentonite seals to isolate each coarse-grained zone and a cement annular <br />seal to a depth of 185 feet bgs. Test well design features are included in Table 1. <br />Table 1. Tennis Park Test Well Construction Information <br />Depth of Borehole (ft bgs) 820 <br />Borehole Diameter Diameter (in.) 14.75-Inch (0-780 ft bgs) <br />8.75-Inch (780-820 ft bgs) <br />Depth of Well (ft bgs) 770 <br />Blank Casing <br />Depth (ft bgs) <br />0-195, 215-220, 240-300, 320- <br />380, 420-470, 520-560, 600-700, <br />730-740, 760-770 <br />Diameter (in) 8.625 O.D.* <br />Wall Thickness (in) 0.250 <br />Material Type Mild Steel <br />Screened Interval <br />Depth (ft bgs) <br />195-215, 220-240, 300-320, <br />380-420, 470-520, 560-600, <br />700-730, 740-760 <br />Screen Type Louvered (Ful-Flo) <br />Slot Size (inches) 0.060 <br />Screen Material Type Mild Steel <br />Gravel Envelope Depth (ft bgs) 187-255, 295-340, 375-525, <br />555-610, 680-780 <br />(type/size) SRI #8 <br />Transition Seal Depth (ft bgs) 185-187 <br />Seal Material Type Fine Sand <br />Intermediate Seal Depth (ft bgs) 255-295, 340-375, 525-555, <br />610-680, 780-820 <br />Seal Material Type Bentonite Chips <br />Annular Seal Depth (ft bgs) 0-185 <br />Seal Material Type 10.3 Sack Sand/Cement Grout <br />*Outside Diameter <br /> <br />After receiving approval of the test well design by Zone 7, the test hole was then reamed from ground <br />surface to a depth of 780 feet at a diameter of 14.75 inches. Borehole reaming operations began on