WORK PLANS FILE 1 - Laserfiche WebLink

Home Browse Search

a M i The presence of floating free product will be checked by noting the depth of the water and marking that level on the probe wire. The probe and wire will be withdrawn from the well and dried. Liquid paste or chalk will be placed on the probe and up the side of the wire for 2 feet (could be higher depending on the depth of the plume) . The probe is then carefully lowered into the well so that the probe just touches and records the water table, care is taken not to lower the probe below the water table . Once the probe has signaled the water table the probe is withdrawn quickly from the well and the liquid level above the water level point on the probe is measured. This liquid level is the floating product thickness and will be recorded on the sampling sheet. Water samples will be obtained as follows: A) First, one full well volume of water will be withdrawn from the well; B) The parameters of pH , conductivity or resistively, and temperature will be measured . The color, odor and presence of a sheen of the bailed water will be noted . C) A 2 and 3 well volume of water will be withdrawn and the parameters remeasured , if the results vary by more than 10% then step C is repeated ; D) The well will be allowed to recover to 80% of its original volume or 2 hours have passed then a sample will be withdrawn and placed in a 40 ml vial supplied by Sherwood Laboratories of Hilmar California.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 vials 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 a clean water. Contaminated water will be removed from the site by a licensed waste hailer. 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 tests run will be as follows: Test Detection Limits DHS TPH Method (gasoline) 500 ug/L EPA 602 for Benzene 0 . 3 ug/L Toluene 0. 3 ug/L EthylBenzene 0 . 3 ug/L