1) A grab sample is a one-time sample that represents the discharge in the beginning of the rainfall event. The grab sample must be taken in the first hour of the discharge. The laboratory recommends taking a 3000 milliliters (ml) sample (about two quarts) to ensure enough water to perform all tests is available. The seven parameters tested will cost approximately $195.
2) A time-weighted composite sample is taken at timed intervals in equal amounts. The composite sample is taken as a combination of (at least three) small samples (called aliquots) taken throughout the duration of the discharge (for at least three hours), with each small sample being separated by at least 15 minutes. The laboratory recommends taking 300-1000 ml at each sample so that the total amount of the composite sample is 3000 ml (about two quarts) to ensure enough water to perform all tests is available. The five parameters tested will cost about $125.
Both sets of samples, the grab and the composite, must be tested for five parameters:
- five day biochemical oxygen demand (BOD);
- chemical oxygen demand (COD);
- total suspended solids (TSS);
- total Kjeldahl nitrogen (TKN);
The grab sample must be tested for two additional parameters:
The Sample Collection Kit will include:
2 Large Amber Glass Sulfuric Acid (H2SO4) Preserved for Oil & Grease GRAB sample
2 Quart Plastic - NO TREATMENT
One each for BOD & TSS Composite & BOD, TSS & pH Grab samples
2 Quart Plastic - Sulfuric Acid (H2SO4) Preserved
One each for COD, TKN, PO4 Composite & COD, TKN, PO4 Grab samples
Automotive salvage yards have particular concerns for adding pollutant to storm water runoff due to the sheer number of vehicles present in a yard at any given time. Effective pollution prevention of these storm water pollutants is accomplished through choosing the most applicable Best Management Practice (BMP) as identified in the Storm Water Pollution Prevention Plan (SWPPP) developed as part of the storm water permit requirements.
The Storm Water Permit Process –Six simple steps to compliance
1) Complete a Notice of Intent (NOI) to discharge storm water. Iowa DNR Form 542-1415.
2) Run a public notice in two widely distributed local newspapers.
3) Prepare and maintain a Storm Water Pollution Prevention Plan (SWPPP).
4) Pay the applicable fee to the Iowa DNR. $300 per salvage yard for a three-year permit.
5) Begin annual inspection of the facility and provide training to employees.
6) Annually monitor the storm water runoff by collecting samples for laboratory analysis.