ARCHIVED REPORTS XR0010486 - Laserfiche WebLink

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Water Sampling Protocols The equipment used to withdraw water from the well will be 2 PVC bailers One bailer will be used to purge the well and the other will be used to withdraw the sample All equipment including the bailers, and bailing cord, and the water depth measuring devise must be decontaminated prior to entering any well They will be decontaminated by washing with Tri-sodium Phosphate detergent and water and thoroughly rinsing them with clean water The depth to groundwater will be measured from the highest point on the top of the casing to the surface of the water table The devise used will be an electric conductivity devise which trips a red light and a buzzer when the probe touches water A minimum of three measurements will be made at each well, the final reading will be noted after 2 or more readings do not vary by more than 0 03 feet Once the depth to water is known the tape and probe will be withdrawn from the well and thoroughly dried A small amount of water paste will be placed on the axis of the probe and the t probe will be lowered to the water table Care will be taken to not allow the probe to descend into the water below the contact point Then the probe will be withdrawn rapidly and inspected for signs of fluid above the contact point If fluid is noted the is will be smelled to verify it is fuel, then the thickness of the fuel will be noted on the measuring log Water samples will be obtained as follows - A) First one full well volume of water will be withdrawn from the well, B) The parameters of Ph, Conductivity, and Temperature will be measured; C) A 2nd and 3rd well volume of water will be withdrawn and the parameters remeasured, if the results vary by more than 10% then step C as repeated, D) The well is allowed to recover to 80% of its original volume or 2 hours have passed then a sample will be withdrawn and placed in its appropriate container Purged water will be placed in a drum sealed and left at the site until its hazardous condition is assessed Water samples will be taken from the water at or near the surface of the water table, unless otherwise indicated Water will be placed within the prescribed container for the tests required. The containers will be filled so that zero headspace is present in the sealed vial one drop of concentrated HCL will be added, then they will be placed in a cooler containing ice until delivered to the lab Samples must be analyzed within 14 days of sampling. Trip blanks will accompany all sample containers. A Chain of Custody will be filled out by the sampler, detection limits must be supplied by the laboratory.