NJ Water/Wastewater Operator cheat sheet

A source water assessment identifies the susceptibility of each public water system intake or well to potential contaminant sources within its delineated area.

Groundwater under the direct influence of surface water (GUDI) is subject to surface water treatment rules because it can contain surface-water pathogens.

Specific capacity is pumping rate divided by drawdown, expressed as gallons per minute per foot of drawdown, and indicates well yield efficiency.

A well's safe yield is the maximum sustained pumping rate that does not cause excessive drawdown, interference, or water-quality deterioration.

Thermal stratification in a reservoir creates a warm upper layer and cold lower layer; turnover mixes the layers and can change raw-water turbidity, iron, manganese, and taste-and-odor compounds.

Wellhead protection areas are delineated zones around a well where contaminant sources can reach the well within a specified time of travel.

Surface water intakes are sited to avoid immediate pollution sources and to provide reliable withdrawal during low-flow conditions.

Raw-water quality parameters monitored at a surface intake include turbidity, pH, temperature, alkalinity, and bacterial indicators.

Primary maximum contaminant levels (MCLs) are enforceable health-based limits; secondary MCLs address aesthetic qualities such as taste, odor, color, and corrosivity.

The lead action level is 0.015 mg/L and the copper action level is 1.3 mg/L, evaluated at the 90th percentile of samples.

The nitrate MCL is 10 mg/L as nitrogen; the nitrite MCL is 1 mg/L as nitrogen.

The arsenic MCL for public water systems is 0.010 mg/L.

The Stage 2 Disinfectants/Disinfection Byproducts Rule uses locational running annual averages: TTHM 80 µg/L and HAA5 60 µg/L.

Filtered surface water systems using conventional treatment must meet turbidity of 0.3 NTU in at least 95% of monthly samples and never exceed 1 NTU.

The total coliform rule uses presence/absence results; E. coli-positive samples trigger repeat sampling and public notification requirements.

A detectable disinfectant residual in distribution helps limit microbial regrowth and indicates treatment integrity.

CT is disinfectant concentration (mg/L) multiplied by contact time (minutes); CT requirements increase with pH for chlorine because hypochlorous acid dissociates to less effective hypochlorite.

Chlorine dose equals chlorine demand plus desired residual: dose = demand + residual.

Coagulation destabilizes particle charges; optimum coagulant dose and pH are determined by jar tests.

Flocculation provides gentle mixing to grow settleable floc after rapid mix; sedimentation removes floc before filtration.

Granular media filters remove particles; backwashing uses upward flow with expansion to remove captured solids, followed by filter-to-waste or ripening.

Lime-soda softening removes calcium and magnesium hardness by precipitation, producing sludge that must be handled.

Aeration strips volatile organic compounds and hydrogen sulfide and can oxidize iron and manganese to filterable forms.

Granular activated carbon adsorbs organic compounds; powdered activated carbon is dosed for temporary taste-and-odor or spill response.

Membrane processes are classified by pore size: microfiltration and ultrafiltration remove particles and microbes; reverse osmosis removes dissolved ions.

Distribution systems are operated to maintain positive pressure; a minimum of 20 psi is required during main breaks and fire-flow conditions to prevent contamination.

Water age increases in oversized mains, dead ends, and low-demand areas; flushing and storage turnover reduce stagnation.

An air gap is the highest-hazard backflow protection because it provides a physical separation between potable and nonpotable water.

A reduced-pressure-zone backflow preventer uses two check valves and a relief valve to protect against both backpressure and backsiphonage.

After a main repair, the main is disinfected, flushed, and sampled for bacteriological quality before being returned to service.

Gravity sanitary sewers are designed for self-cleansing velocity, typically about 2 ft/s at full or design flow, to prevent solids deposition.

Infiltration is groundwater entering a sewer through defects; inflow is stormwater entering through direct connections such as roof drains or catch basins.

A sanitary sewer overflow is a release of untreated sewage from the collection system and must be reported and corrected under NJDEP requirements.

Centrifugal pump affinity laws: flow varies directly with impeller speed, head with the square of speed, and brake horsepower with the cube of speed.

Pump brake horsepower = (flow in gpm × total head in ft) / (3960 × pump efficiency).

Cavitation occurs when local pressure drops below vapor pressure, forming vapor bubbles that collapse and damage impellers; adequate NPSH prevents it.

The operating point of a pump is the intersection of the pump curve and the system-head curve.

A confined space entry requires testing for oxygen, flammable gas, and toxic gas; entry proceeds only if oxygen is at least 19.5%.

Lockout/tagout isolates hazardous energy before maintenance and requires verification that the equipment cannot be started.

Portable ladders are set at a 4:1 slope: one foot of base distance for every four feet of working height.

Excessive pump vibration, bearing temperature, or packing leakage indicates mechanical wear or misalignment and is tracked through preventive maintenance.

Chlorine residual is measured at the time of sampling because chlorine is unstable; the DPD colorimetric method is commonly used.

Bacteriological drinking water samples are collected in sterile bottles containing sodium thiosulfate to neutralize chlorine and are held no more than 30 hours before analysis.

Turbidity is reported in nephelometric turbidity units (NTU) and is measured with a calibrated nephelometer.

A chain-of-custody form documents sample possession from collection through laboratory analysis and supports legal defensibility.

Quality control samples include method blanks, duplicates, matrix spikes, and known standards to verify accuracy and precision.

Sample preservation and holding times are method-specific; pH, temperature, and residual chlorine are generally measured in the field.

Laboratory results outside permit limits trigger confirmation, resampling, and reporting according to the system's monitoring schedule.

The New Jersey Safe Drinking Water Act is administered by NJDEP's Bureau of Safe Drinking Water, which oversees public water system compliance.

Public water systems must be operated by licensed operators; operator licenses are classified by system type and grade and require continuing education.

The Consumer Confidence Report summarizes source water, detected contaminants, and health effects and is distributed annually to customers.

Public notification is tiered by risk: Tier 1 is immediate for acute health risks, Tier 2 within 30 days, and Tier 3 in the annual report.

A sanitary survey is an on-site inspection of a public water system's source, treatment, distribution, operation, and records.

Wastewater dischargers covered by an NJPDES permit submit discharge monitoring reports (DMRs) that document compliance with permit limits.

Records such as monitoring results, operating logs, and maintenance records are retained for specified periods and made available to the regulatory agency.

Security measures include controlling access to treatment chemicals, intakes, and control systems and reporting suspicious activity to authorities.