Page 102 - Beaumont Basin Watermaster

The maximum TDS concentrations for domestic wells within the basin ranged from 190 to 370
mg/L and averaged 248 mg/L; this average value is 22 mg/L lower than the average maximum
TDS concentration reported in the 2008-11 Engineering Report indicating that TDS
concentrations have been fairly stable in the last 10 years.

In the Singleton Basin / Edgar Canyon area, the maximum TDS concentration ranged from
190 to 550 mg/L and averaged 286 mg/L. The average TDS concentration for all samples in
this area was 276 mg/L.

In the South Beaumont Basin, the maximum TDS concentration ranged from 220 to 780 mg/L
and averaged 510 mg/L. The average TDS concentration for all samples in this area was 475
mg/L.

Average and maximum TDS concentrations for all sampled wells within the basin are as
follows:

Average Avg Max
Well Classification Count Samples
Concentration Concentration
Beaumont Groundwater Basin

Appropriators 15 34 226 247
Overlyiers 5 7 270 274
Other 7 8 244 244
Total 27 49

Singleton Basin / Edgar Canyon Area

All Wells 17 22 276 286

South Beaumont Basin
All Wells 10 32 475 510

Of the 20 potable wells, 7 wells had a maximum concentration below the anti-degradation
objective of 230 mg/L, 12 wells were between the anti-degradation and maximum benefit
objective of 330 mg/L, and one exceeded the maximum benefit objective for the BMZ. None of
the production wells samples exceeded the secondary federal or state drinking water standard
for TDS (500 mg/L). BCVWD wells along Edgar Canyon were not included in the analysis of
domestic wells.

In the Singleton Basin / Edgar Canyon area, five wells had a maximum concentration below
the anti-degradation objective, seven wells were between the anti-degradation and maximum
benefit objective of 330 mg/L, and the remaining four wells exceeded the maximum objective
with one well also exceeding the secondary drinking standard.

In the South Beaumont Basin, one well had a maximum TDS concentration below the anti-
degradation objective, one well was between this and the maximum objective, and the
remaining eight wells exceeded the maximum objective. Most of the wells with the highest

Beaumont Basin Watermaster 2017 Annual Report – DRAFT – February 2018 4-2