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These 10 free CPISM questions are organized by exam domain, so you can see how each part of the Certified Professional in Industrial Stormwater Management blueprint is tested. Reveal the answer and explanation under each question.
The piping schedule for a facility operating under EPA's 2021 Multi-Sector General Permit (MSGP) lists four non-stormwater lines proposed for connection to storm drainage. No separate wastewater permit authorizes these flows. Which line carries an allowable non-stormwater discharge, provided the applicable MSGP conditions are met?
Correct answer: D - Uncontaminated condensate from the building's air-conditioning system.
All manufacturing at an equipment plant occurs indoors. A no-exposure inspection documents the outdoor conditions below. Which finding prevents the facility from using the federal conditional no-exposure exclusion?
Correct answer: D - Powdered raw material is exposed to rain during unloading, although it is stored indoors afterward.
An environmental manager reviews a scrap recycler's first four quarterly total suspended solids (TSS) results under EPA's 2021 Multi-Sector General Permit (MSGP). Their annual average is 138 mg/L against the applicable 100 mg/L benchmark. The facility is at baseline status, no Additional Implementation Measures (AIM) exception applies, and there is no separate numeric TSS effluent limit. What response does this result require?
Correct answer: C - Enter AIM Level 1 and immediately review the stormwater pollution prevention plan and existing controls.
Zinc concentrations at an industrial outfall rise after a galvanized roof is added to the drainage area. Samples collected directly from the roof's downspout have elevated zinc but little suspended sediment; runoff sampled separately from the truck yard has low zinc. Equipment blanks show no detectable zinc. Which explanation best fits this pattern?
Correct answer: A - Weathering of the new roof's zinc coating.
To obtain a clearer stormwater sample, a new sampler passes muddy runoff through a 0.45-micrometer filter before filling the bottle for total recoverable zinc. The laboratory reports a value below the facility's benchmark and confirms that preservation and laboratory quality-control checks passed. How should the environmental manager interpret that result?
Correct answer: A - The filtered sample cannot establish the total recoverable zinc concentration.
Three hours after stormwater collection, a laboratory makes the event's first pH measurement. The sample arrived on ice, but no field pH reading was recorded. Separate bottles for total suspended solids (TSS) and chemical oxygen demand (COD) were correctly preserved, met their holding times, and passed laboratory quality-control checks. The appropriate result-validation decision is:
Correct answer: B - Retain TSS and COD; measure a new pH sample within 15 minutes of collection.
A catch-basin inspection record for a facility under EPA's 2021 Multi-Sector General Permit (MSGP) shows a sump depth of 12 inches, measured from the bottom to the lowest outlet-pipe invert. Debris is 7 inches deep. The manufacturer's cleanout threshold is 10 inches of debris, and water is still draining freely. Which maintenance entry is appropriate?
Correct answer: C - Clean now; the remaining 5-inch clearance is below the required 6 inches.
An inlet receives runoff from 2 acres of pavement (C = 0.90) and 3 acres of landscaped ground (C = 0.30). A separate 1-acre roof (C = 0.90) drains elsewhere. The contributing catchment's time of concentration is 15 minutes. For the selected design frequency, rainfall intensities are 4.0 inches/hour for 5 minutes and 2.5 inches/hour for 15 minutes. Use the approximate Rational Method expression Q = i × sum(C × A), with Q in cubic feet/second and A in acres. The proposed inlet can pass 8.0 cubic feet/second. Which capacity assessment uses the appropriate contributing area and rainfall duration?
Correct answer: B - About 6.8 cubic feet/second; the inlet has sufficient capacity.
A resin distributor covered by EPA's 2021 Multi-Sector General Permit (MSGP) installs 1-millimeter screens at downgradient storm drains. Whole pellets are retained, but smaller resin particles still pass through with runoff after transfers. The manager points to the permit's example of a 1-millimeter screen and considers the plastic-control requirement satisfied. Which conclusion is correct?
Correct answer: D - Plastic discharges must be eliminated; matching the example screen size is insufficient.
Following yard regrading, runoff from an uncovered metal-cutting area reaches Outfall 002 instead of Outfall 001. Both outfalls remain authorized under EPA's 2021 Multi-Sector General Permit (MSGP). The stormwater pollution prevention plan (SWPPP) still shows the old drainage divide, and its sampling schedule assigns the cutting area's metals to Outfall 001. Which revision is necessary to restore a defensible plan?
Correct answer: B - Update the map, source-to-outfall assignments, and monitoring requirements to reflect the changed drainage.
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