Page 566 - trc_centennial_deir201705

5.4 Water Quality

TABLE 5.4-2
2007 GROUNDWATER MONITORING DATA FOR THE PROJECT AREA

MCL or
Other Harris Well TRC-98
Parameter Units Threshold DWR-32 TRC-98 (MW-5D) (DUP 1)
Metals
Arsenic mg/L 0.010 ND 0.0119 0.0157 0.0116
a
Barium mg/L 1.0 0.0394 0.0548 0.0532 0.0532
a
Molybdenum mg/L 0. 04 0.00618 0.00806 ND 0.00722
b
Vanadium mg/L 0.036 ND 0.00558 ND 0.0054
c
Iron mg/L 0.3 ND ND 0.317 ND
d
Manganese mg/L 0.05 ND ND 0.00785 ND
d
Boron mg/L 1 0.148 0.255 0.546 0.247
c
Zinc mg/L 5 0.13 0.0309 0.455 0.0205
c
a
Chromium VI mg/L 0.01 ND ND ND ND
General Chemistry
Chloride mg/L 250 22 16 14 16
d
Sulfate mg/L 250 83 55 88 56
d
Perchlorate µg/L 6 ND ND ND ND
a
Color Color unit 15 d 5 5 5 5
Turbidity N T U 5 d 1.2 0.090 3.1 0.070
Odor TON 3 ND ND ND ND
d
Specific
Conductance µS/cm 900 600 470 570 470
d
TDS mg/L 500 394 318 402 322
d
pH pH units 6.5–8.5 7.33 7.49 7.42 7.47
e
a
Cyanide mg/L 0.15 ND ND ND ND
Fluoride mg/L 2 0.74 0.62 0.38 0.62
a
Nitrite mg/L 1 ND ND ND ND
Nitrate mg/L 10 f 2.9 2.8 1.6 3
MBAS mg/L 0.5 ND ND ND ND
d
MCL: Maximum Contaminant Level; mg/L: milligrams per liter; ND: Not Detected; µg/L: micrograms per liter; NTU:
Nephelometric Turbidity Units, a measurement of turbidity; TON: Threshold Odor Numbers, a measurement dilutions
needed to achieve odor free water; µS/cm: microSiemens per centimeter, or a measurement of the rate of electrical flow
through a solution; pH: hydrogen potential; CCR: California Code of Regulations; USEPA: U.S. Environmental Protection
Agency
a California Department of Public Health Primary Drinking Water MCL (22 CCR, Table 64431-A and Table 64444-A).
b USEPA Health Advisory
c California Department of Public Health Notification Level 1
d California Department of Public Health Secondary Drinking Water MCL (22 CCR, Table 64449-A and Table 64449-B).
e USEPA Secondary MCL
f USEPA Primary MCL
Source: Geosyntec Consultants 2016b.

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Draft EIR