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. A <br /> transport. Cooling samples will cause condensation of trailer consist of an air compressor,two 150-gallon <br /> moisture within the sample,thereby distorting the laboratory polyethylene tanks,pneumatic pumps,and hoses. <br /> analysis. <br /> The Injection hoses are attached to the desired injection <br /> To minimize the potential for cross-contaminatron between wells via an Injection access point. The injection access <br /> air samples,the polyethylene tubing is replaced with new point consists of'A-Inch stainless steel tee which screws into <br /> ging. a coupling attached to the injection well and injection hose. <br /> The coupling Is glued to the injection well at least 48 hours <br /> Vapor samples are also subject to the same hold times and prior to the injection event to ensure the PVC glue has time <br /> must be stored as stated in SOP-10. to properly set and the well elevation is resurveyed. <br /> SOP-16 After the injection hoses are attached to the desired wells, <br /> SOIL GAS SAMPLING FROM SOIL VAPOR POINT the trailer-mounted tanks are filled with potable water from <br /> an onsite source. As the tanks fill,the chemical oxidant Is <br /> installation of a soil vapor point may be performed with a mixed into the tank. The amount of oxidant mixed in the <br /> hand auger or truck mounted auger drilling rig. Once the tank is dependent on the desired concentration of the <br /> boring has achieved the desired depth,a 64rich long slotted solution. After the tanks have been filled,the trailer-mounted <br /> probe,capped on both ends with one end fitted with a air compressor is started and air is supplied to the pneumatic <br /> Swagelok fitting attached to 3116-inch diameter Nylon tubing pumps. The pneumatic pumps force the solution Into the <br /> of desired length Is placed in the boring and 12 inches of well through the injection hoses at a maximum of 20 pounds <br /> filter pack placed in the annulus. A layer of dry bentonite per square inch gauge(pslg). The pressure of injection is <br /> powder or chips,followed by a layer of hydrated bentonite, controlled by a valve and can be reduced,If necessary to <br /> and a final layer of dry bentonite powder or chips will be avoid damaging the well and well seal. Additionally,each <br /> placed in the annulus above the filter pack. Excess tubing at Injection access point is equipped with a pressure gauge to <br /> the top is coiled and placed in a flush finished well box. monitored the pressure at each injecllon well individually. <br /> Soil vapor samples will be collected no sooner than one After the total volume of solution has been injected,the <br /> week after probe installation to permit soil vapors to tanks are washed down with potable water to remove any <br /> accumulate within the probe. Soil vapor sampling will occur chemical residue from the tank. The rinsate water is then <br /> after a minimum of f ive consecutive precipitation-free days injected into the well to clean out the hoses. After the <br /> and after any on site irrigation has ceased. injection actlAtres have terminated,the injection access <br /> points are left on the wells to ensure that pressure in the <br /> The sampling equipment consists of a TedlarTm bag wells declines to background levels prior to removing the <br /> (available in 1,3,5,and 10 liter sizes),a diaphragm pump, access points and hoses. A pressure relief valve Is located <br /> and 3116-1nch•dfameter polyethylene tubing(approximately 1 on the access points to relieve any excess pressure above <br /> foot long). The TedlarTM bag should be fisted with an integral 20 psig. <br /> valve for filling and sealing the bag after sampling.The <br /> diaphragm pump inlet and outlet are fitted with 3/16-inch <br /> hose barbs for attaching the sample tubing. A sample label <br /> with the sample number and date and time of sample <br /> collection is prepared and placed on the TedlarTM bag. <br /> The sampling procedure requires the end of the tubing from <br /> the probe be connected to the diaphragm pump inlet hose <br /> barb to form an air-tight connection. The sampling pump is <br /> then started and the pump Is pbrged for 1 minute with the <br /> vapor to be sampled. Following purging,the discharge of <br /> the pump is then connected to the Tedlafm bag using a <br /> section of 3/16-inch tubing. The pump is restarted and the <br /> bag Is opened and allowed to fill to approximately 314 of its <br /> capacity. Caution should be taken not to overfill the <br /> sampling bag. The sample is placed in a non-refrigerated <br /> dry cooter with sufficient packing to prevent damage during <br /> transport. Cooling samples will cause condensation of <br /> moisture within the sample,thereby distorting the laboratory <br /> analysis. <br /> To minimize the potential for cross-contamination between <br /> air samples,the polyethylene tubing on the discharge side of <br /> the pump is replaced with new tubing. <br /> Vapor samples are also subject to the same hold times and <br /> must be stored as stated In SOP-10. <br /> SOP-17 <br /> PRESSURIZED SOLUTION INJECTION <br /> For remediation purposes,a portable injection trailer is used <br /> to Inject a solution of potable water and a chemical oxidant <br /> suited to remedlate contamination at the site- The injection <br />