Figure 1. Map showing location of Cattlemans detention basin with respect to Lake Tahoe and California.

Figure 1. Map showing location of Cattlemans detention basin with respect to Lake Tahoe and California.

Figure 2. Map showing location of Cattlemans detention basin in relation to Cold Creek, Pioneer Trail, and Cattlemans Court, South Lake Tahoe, California. Well identification numbers are abbreviated by omitting the “cc” designation preceding each number.

Figure 3. Distribution of sediments beneath Cattlemans detention basin between wells 3 and well 14, South Lake Tahoe, California.

Cement grout1.5 to 3 feet thick

Native material1 to 6 feet thick

Silica flour1 to 3 feet thick

Coarse silica sand2 to 3 feet thick

Sealed and lockablePVC cap

1-foot long screen

Schedule 40PVC casing

Hole diameter 4 to 7 inches

Figure 4. Schematic showing construction of wells near Cattlemans detention basin, South Lake Tahoe, California.

Figure 5. Map showing the distribution of hydraulic conductivity near Cattlemans detention basin, South Lake Tahoe, California.

3

2

9 9

4

0

1

2

3

4

5

6

7

8

9

10

0.3 - 1 >1 - 3 >3 - 10 >10 - 30 >30 - 100

OC

CU

RR

EN

CE

S

HYDRAULIC CONDUCTIVITY, IN FEET PER DAY

Average = 18 feet per dayMedian = 10 feet per dayStandard deviation = 16 feet per day1-percentile = 0.63 feet per day25-percentile = 10 feet per day75-percentile = 20 feet per day99-percentile = 62 feet per day

Figure 6. Bar graph showing the occurrences in hydraulic conductivity in all tested wells near Cattlemans detention basin, South Lake Tahoe, California.