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vary by more than 10% for the conductivity or temperature or 0 . 1 on the pH reading then step C is repeated until the readings ' are within the limits. D) The well will be allowed to recover to 800 of its original volume or 2 hours have passed (remeasured) then a sample will be ' withdrawn and placed in a the appropriate sample bottle supplied by Sherwood Laboratories of Hilmar California. Sherwood Labs supplies the sample vials with the proper amount of Hydrochloric Acid in each bottle, so no further acid or any other chemical should be added to the water. The bottles will be placed on ice in a cooler and kept on ice until delivered to the lab or turned over to their courier within 48 hours of the sampling time. Purged water will be placed in a sealed drum and left at the ' site. The drums will be labeled for the source of the water. After the chemical analyses are completed the contamination in each drums will be assessed. If the chemical analyses of the water in a drum shows the water to be free of contamination then ' this water will be disposed of as clean water. Contaminated water will be removed from the site by a licensed waste hauler. Water samples will be taken from the water at or near the surface of the water table , unless otherwise indicated. The containers will be filled so that zero headspace is present in the sealed vial before placing in the cooler. Trip blanks will accompany all sample containers. A Chain of Custody will be filled out by the sampler. The one liter brown bottles for TPH-diesel must have a small 40 t0 60 ml of headspace, if not the bottles will break during transport.The tests run will be as follows : Test Detection Limits DHS TPH Method (Gasoline)/(Diesel) 50 ug/L EPA 602 for Benzene 0 .5 ug/L Toluene 0 . 5 ug/L Ethyl Benzene 0 .5 ug/L Xylenes 0 . 5 ug/L All laboratory results , well measurements and the Chain of Custody must be sent to our office for evaluation and the preparation of a report.