WAC 246-291-330   Inorganic chemical and physical.  (1) Monitoring.

     (a) A complete inorganic chemical and physical analysis shall consist of the primary and secondary chemical and physical standards.

     (i) Primary chemical and physical standards are antimony, arsenic, barium, beryllium, cadmium, chromium, cyanide, fluoride, mercury, nickel, nitrate (as N), nitrite (as N), selenium, sodium, thallium, and turbidity.

     (ii) Secondary chemical and physical standards are chloride, color, hardness, iron, manganese, silver, specific conductivity, sulfate*, total dissolved solids*, and zinc.

     *Required only when specific conductivity exceeds seven hundred micromhos/centimeter.

     (b) Samples taken for inorganic chemical analyses shall be collected at the source before treatment.

     (c) Owners shall ensure submittal of at least one initial complete analysis from each source or well field;

     (d) After the initial complete analysis, owners shall ensure submittal to the department of results of at least one nitrate sample analyzed from each source or well field every thirty-six months; and

     (e) When treatment is provided for one or more inorganic chemical or physical contaminants, samples shall be taken for the specific contaminant or contaminants before and after treatment. The department shall determine the frequency of sampling.

     (2) Follow-up. When an initial analysis of a substance exceeds the MCL, the owner shall ensure that at least one additional sample is immediately taken from the same sampling point and analyzed for any substance which exceeded the MCL. If the average of the samples exceeds the MCL, a violation is confirmed.

     (3) MCLs. The primary and secondary MCLs are listed in Tables 1 and 2

Table 1

INORGANIC CHEMICAL CHARACTERISTICS

Substance Primary MCLs (mg/L)

Antimony
0.006
Arsenic 0.05
Barium 2.0
Beryllium 0.004
Cadmium 0.005
Chromium 0.1
Cyanide 0.2
Fluoride 4.0
Mercury 0.002
Nickel 0.1
Nitrate (as N) 10.0
Nitrite (as N) 1.0
Selenium (Se) 0.05
Sodium (Na) *
Thallium 0.002

Substance
Secondary MCLs (mg/L)

Chloride (Cl)
250.0
Fluoride (F) 2.0
Iron (Fe) 0.3
Manganese (Mn) 0.05
Silver (Ag) 0.1
Sulfate (SO4) 250.0
Zinc (Zn) 5.0

Note: Although the state board of health has not established an MCL for sodium, there is enough public health significance connected with sodium levels to require inclusion in inorganic chemical and physical monitoring.

Table 2

PHYSICAL CHARACTERISTICS

Substance Primary MCL

Turbidity
1-0 NTU

Substance
Secondary MCLs


Color 15 Color Units
Hardness None established
Specific Conductivity 700 umhos/cm
Total Dissolved Solids (TDS) 500 mg/L




[Statutory Authority: RCW 43.20.050. 94-14-002, § 246-291-330, filed 6/22/94, effective 7/23/94.]