Laserfiche WebLink
FIELD PROCEDURES <br /> ,! The following section describes field procedures that were completed by Delta personnel in the <br /> performance of the tasks involved with this project <br /> 1QUARTERLY GR UND WATER SAMPLING <br /> 1 1 Ground-Water 11nd Frei—Floating Frei—FloatingProdLiCt DeRth Determination <br /> A water/petroleum product interface probe was used to determine free product thickness and ground water <br /> depth in each well If a free-floating product layer was not detected by the interface probe, the tip of the <br /> probe was subjectively analyzed for product sheen <br /> 1.2 Subjective Analysis of Ground W ter <br /> Prior to purging of ground water monitoring wells, a water sample was collected from each monitoring <br /> well for subjective analysis The retrieving of the sample involved gently lowering a clean, disposable <br /> Teflon bailer to approximately one-half the bailer length past the air/liquid interface The bailer was then <br /> retrieved, and the sample contained within the bailer was examined for floating product levels and <br /> appearance of a petroleum product sheen <br /> 3 Monitoring Well Purging and Sampling <br /> Monitoring wells were purged using a centrifugal pump capable of producing approximately 5 gallons <br /> per minute Ground water removed from the wells was stored in 55-gallon barrels at the site The <br /> barrels were labelled with corresponding monitoring well numbers and the date of purging. Purge water <br /> will be collected from the storage barrels in a vacuum truck and transported to an appropriate facility for <br /> treatment and/or disposal After purging, ground water levels were allowed to stabilize A water sample <br /> was then removed from each of the wells by use of a Teflon bailer Samples were collected in air-tight <br /> vials, appropriately labeled, and stored on ice from the time of collection through the time of delivery <br /> to the laboratory A chain-of-custody form was completed to ensure sample integrity. Ground water <br /> samples were transported to the laboratory and analyzed within the EPA-specified holding times for the <br /> requested analyses <br /> QMA109 low <br />