La Habra-Brea Management Area
Depth to Groundwater - Well 3/10-9G1
60
50
40
30
20
10
0
Figure 3-8: Recent Depth to Groundwater.
3.2.4 Groundwater Storage Data
According to the DWR Bulletin 45 (1934), the storage capacity of the historical La Habra Groundwater Basin is approximately 153,000 acre-feet. Approximately 57 percent of the historical La Habra Groundwater Basin is in the eastern portion of the basin which is now designated within Basin 8-1. The Cities of La Habra and Brea overlie approximately 60 percent of the eastern portion of the historical La Habra Groundwater Basin (Stetson, 2014). Accordingly, the storage capacity of the current La Habra Groundwater Basin is approximately 55,000 acre-feet.
3.2.5 Groundwater Quality Conditions
Previous investigations of water quality within the La Habra Basin determined that the quality is extremely variable. It was shown that shallow regions within the central portion of the basin as well as areas recharged by surface water along the basin boundary are of a bicarbonate and chloride character. Sulfate concentration increased with depth in the La Habra and San Pedro water-bearing zones. The historical data also shows that total dissolved solids (TDS) concentrations have remained relatively stable (Montgomery, 1977). The most recent 10-year average TDS concentrations in the La Bonita, Portola, and Idaho wells are 1,052 mg/l, 750 mg/l, and 802 mg/l, respectively. Overall, groundwater from the San Pedro Aquifer is considered to be of fair to good quality (Montgomery, 1979). However, groundwater produced from the La Habra Groundwater Basin is not currently used directly for potable purposes due to water quality concerns that predate SGMA legislation. Water from the La Bonita and Portola Wells is chlorinated and then blended
2017 BASIN 8-1 ALTERNATIVE
3-10
Appendix F - 27
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