ARCHIVED REPORTS_XR0006611 - Laserfiche WebLink

Home Browse Search

using either a centrifugal pump connected to a dedicated Wattera pump or a pre-cleaned . submersible pump Temperature, pH, and specific conductance of the purge water will be monitored during the purging process at regular intervals Purging will cease when the monitored parameters have stabilized (three consecutive readings not varying by more than 10-percent) and a minimum of three well volumes have been purged In the event a well dues out dunng purging, the well will be allowed to recover to 80-percent of it's original well volume, or for 24-hours, whichever is less, prior to collecting a groundwater sample. Groundwater Monitoring Well Sampling Once a well has been successfully purged a groundwater sample will be collected using a disposable polyethylene bailer connected to clean nylon or polyethylene cord. The bailer will be lowered slowly into the water to avoid agitation of the sample A portion of the sample will be placed in a container and the monitoring parameters will be recorded The remaining portion of the sample will be transferred from the bailer to the appropnate, laboratory supplied sampling bottles, using a bottom emptying device. Containers for volatile organic analyses will be filled completely, leaving a positive meniscus, so no airspace remains in the vial after sealing. The sample bottles will be labeled with the well idenufication (i.e MW-1, MW-2, etc), date and time of the sample collection, the field technicians initials, fob number, analyses to be performed, and other relevant information Samples will immediately be placed in an insulated cooler containing blue ice. The samples will be maintained at approximately 4°C until reaching the analytical laboratory Laboratory Analysis Samples will be shipped, under appropriate chain-of-custody procedures, to SPL Laboratory in Houston, Texas, within 48-hours following collection SPL Laboratory is certified by the State of California for performing the requested analyses. Samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHg), diesel fuel, (TPHd), and benzene, toluene, ethylber zene, and xylene isomers, following Environmental Protection Agency Methods 5030, 8015 modified, and 8020. Samples will be analyzed on a standard two weep turn-around time QA/QC Procedures ' Instrument cal ration Equipment used to monitor groundwater parameters will be calibrated pnor to beginning purging at the site Monitoring equipment will be calibrated following the manufactures instructions using laboratory grade'standards. I I Equipment Decon minatzon. Non-disposable and Inon-dedicated sampling equipment Iwill be cleaned prior to use and between uses in each well. Downhole'f equipment will Ibe I � I I I I 'I Ir 'II f I k1l ISI` iIl'f 'II11 i II i{ I I' A1,, � I ,E