SAP Addendum Specific to Delivery Order TO 0008

Section 3 - Decontamination Procedures

3.0 - Decontamination Procedures

All equipment that may directly or indirectly come into contact with samples will be decontaminated in a designated decontamination area. These include any sampling instruments used in the collection of groundwater samples. In addition, the contractor will take care to prevent the sample from coming into contact with potentially contaminating substances such as tape, oil, engine exhaust, corroded surfaces, and dirt.

The following procedure will be used to decontaminate sampling devices such as bailers that can be hand-manipulated and tubing that is not dedicated to the specific well. For sampling, the equipment will be scrubbed with a solution of potable water and Alconox, or equivalent laboratory-grade detergent. Then the equipment will be rinsed with copious quantities of potable water followed by ASTM Type II reagent water. (If equipment has come into contact with oil or grease, rinse the equipment with pesticide-grade methanol followed with pesticide-grade hexane.) The equipment will be air dried on a clean surface or rack, such as Teflon^�, stainless steel, or oil-free aluminum elevated at least 2 feet above ground.

Reagent-Grade II water, methanol, and hexane will be purchased, stored, and dispensed only in glass, stainless steel, or Teflon containers. These containers will have Teflon caps or cap liners. If any question of purity exists, new materials will be used. Methanol and hexane are to be stored in the firehouse flammable liquids storage or other designated area, when not in use.

Table 4 - Sampling Parameters from Groundwater Definitive Data Samples^*

Sampling equipment includes bailers, pH meters, and conductivity meters that directly contact samples. The following steps must be followed when decontaminating this equipment:

1. Set up a decontamination area at the site. The decontamination area should progress from �dirty� to �clean� and end with an area for drying decontaminated equipment. At a minimum, clean plastic sheeting must be used to cover the ground, tables, or other surfaces on which decontaminated equipment is to be placed. However, sampling equipment to be used for organic sample collection will not come into contact with plastic after the final rinse, and oil-free aluminum foil must be used. Plastic sheeting must also be placed to capture reagent Grade II water, hexane, and methanol used for rinsing equipment.

2. Wash the item thoroughly with soapy, laboratory-grade detergent solution. Do not submerge pH meters or conductivity meters. Use a stiff-bristle brush to dislodge any clinging dirt. Disassemble any items that might trap contaminants internally before washing. Do not reassemble until decontamination is complete, and items are dry.

3. Rinse the item in clear potable water. Rinse water should be replaced as needed, generally when cloudy.

4. Rinse the item with ASTM Type II reagent water.

5. Rinse equipment with pesticide grade methanol.

6. Rinse equipment with pesticide grade hexane.

7. After drying, wrap the cleaned item in oil-free aluminum foil for storage at least two feet above the ground.

8. After decontamination activities are completed, collect disposable gloves, boots, and clothing. Place contaminated items in proper containers for disposal.

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