Page 117 - Beaumont Basin Watermaster

Section 4
Water Quality Conditions

ug/L. This concentration is significantly below the state primary MCL of 1,300 ug/L. This is
consistent with previous reporting periods.

Zinc. There were 31 water samples collected and tested for zinc during the reporting period. Zinc
concentration in all wells was below 50 ug/L (ppb), which is significantly lower than the current
secondary MCL of 50 mg/l (ppm).

4.2.3 Organic Compounds

There were over 2,200 lab results for 143 organic compounds during the reporting period.
Concentrations of these compounds in most cases were below the detection limit for purpose
of reporting or just above it. Organics of special concern include the following:

9 TCE – Trichloroethylene (TCE) – 25 samples collected all reported below detection
limit of 0.5 ug/L. Current MCL is 5 ug/L.

9 Tetrachloroethylene (PCE) - 25 samples collected all reported below detection limit of
0.5 ug/L. Current MCL is 5 ug/L.

9 Dibromo-chloropropane (DBCP) - 18 samples collected with most below the detection
limit of 0.01 ug/L; just two samples above this limit at BCVWD Well No. 23 at 0.044
ug/L (Dec 2018) and at 0.028 ug/L (Dec 2015). These concentrations are significantly
below the current MCL of 0.2 ug/L.

4.2.4 pH

There are two secondary standards for pH, a lower limit of 6.5 and an upper limit of 8.5. There
were two wells exceeding the upper MCL for pH during the reporting period, SMWC Well No. 4
at 8.8 (April 2016) and YVWD Well 48 at 8.7 (Jul 17) In addition, there are several wells with
pH in the 8.0 to 8.4 range including Sharondale Mesa HOA Well No. 1 at 8.4, BCVWD Wells
No. 23, 25, and 26 and Sharondale Mesa HOA Well No. 2 at 8.3, BCVWD Wells No. 21 and
29 and the City of Banning Well M-3 at 8.2. The lowest pH was reported from BCVWD Well
No. 22 at 7.4. Four wells in the basin exceeded the upper limit for pH during the FY 2004-08
reporting period.

4.2.5 Turbidity

Turbidity is a measure of the cloudiness of water and is used to indicate water quality and
filtration effectiveness. All production wells in the Basin were tested for turbidity and none
exceeded the primary federal and state MCL of 5 NTU.

Beaumont Basin Watermaster 2018 Annual Report – DRAFT - February 2019 4-11