Section Env-Ws 381.31 - Collection Procedures and Analytical Methods(a) Sample collection shall be conducted using the sample preservation type, container type, and maximum holding time procedures specified in Table 381-4 below: Table 381-4
Sampling Protocol for Corrosion Byproducts & Other Water Quality Factors
| Contaminant | Volume (ml) | Condition | Plastic or Glass | Hold Time |
| Copper | 1000 | HNO3 to lt pH 2 | Plastic or Glass | 6 months |
| Lead | 1000 | HNO3 to lt pH 2 | Plastic or Glass | 6 months |
| Calcium | 500 | HNO3 to lt pH 2 | Plastic or Glass | 6 months |
| pH | 25 | None | Plastic or Glass | Immediately |
| Alkalinity | 100 | Cool to 4°C | Plastic or Glass | 14 days |
| Orthophosphate | 50 | Cool to 4°C | Plastic or Glass | 48 hours |
| Specific Conductance | 100 | Cool to 4°C | Plastic or Glass | 28 days |
| TDS | 100 | Cool to 4°C | Plastic or Glass | 7 days |
| Silica | 50 | Cool to 4°C | Plastic or Glass | 28 days |
| Temperature | -- | -- | -- | Immediately |
(b) Laboratory analyses for lead, copper, pH, conductivity, calcium, alkalinity, orthophosphate, silica, and temperature shall be conducted using the laboratory analytical methods specified in 40 CFR 141.23(k)(1).(c) Analyses for lead and copper shall only be conducted by laboratories that have been certified or accredited by the department as set forth in Env-C 300 or by the EPA.(d) To obtain certification to conduct analyses for lead and copper, laboratories shall conduct analyses for lead and copper in accordance with the criteria set forth in 40 CFR 141.89(a)(1).(e) The department shall use previously collected monitoring data for purposes of monitoring, if the data were collected and analyzed in accordance with the requirements of this section.(f) All lead and copper levels measured between the PQL and the method detection limit (MDL) shall be either reported as measured or shall be reported as0.025 mg/L which is one-half the PQL.(g) A sample result that is below the lead and copper MDL shall be reported as zero.(h) All laboratory data shall be reported using the concentrations and equivalent values as shown in Table 381-5 below: Table 381-5
Reporting Concentrations and Use of Equivalent Values
| Chemical | Concentration |
| Calcium | mg/L as CaCo3 |
| Hardness | mg/L as CaCo3 |
| Alkalinity | mg/L as CaCo3 |
| Phosphate | mg/L as PO4 |
| Silica | mg/L as SiO2 |
N.H. Code Admin. R. Env-Ws 381.31
(See Revision Note at chapter heading for Env-Ws 300) #6521, eff 6-4-97, ss by #7734, eff 8-2-02; amd by #8351, eff 5-14-05