WORK PLANS - Laserfiche WebLink

Home Browse Search

� Groundwater Grab Sample Collection • If groundwater is encountered an attempt to collect groundwater grab samples will be made in the borings. The groundwater grab samples will be collected from Hydropunch-type sampling equipment. t' • Groundwater grab samples will be collected using either a new disposable polyethylene or Teflon bottom-valve bailers, or stainless steel bailer. t • Groundwater grab samples will be placed into laboratory-supplied containers containing preservatives, where appropriate. See Sample Retention and Analysis below. • Groundwater will be discharged from a bailer via a bottom-emptying device. Discharge to the containers will be conducted in'a manner to minimize bubbling and agitation of the liquid. The container will be filled to the top forming a meniscus to eliminate the headspace. • Following all sampling activities, the borings will be backfilled with 20:1 cement: bentonite grout. Sample Retention and Analysis P Y • All samples will be placed on ice in an insulated chest cooled to a temperature of approximately 4 degrees Celsius. • Chain of custody procedures, including the use of chain of custody forms, will be used to document sample handling and transport from collection to delivery to the laboratory for analysis. • The samples will be retained in the insulated chests reserved with ice overnight in the P P g custody of an IT employee. The samples will be picked up after the sampling is completed by a courier supplied by the laboratory, or will be delivered to the laboratory by IT personnel. The samples will be transported to the laboratory in a motor vehicle. • Labotatory quality assurance/quality control procedures are summarized below: — Method Blank Frequency =one per 20 samples — Matrix Spike/Matrix Spike Duplicate = one per 20 samples — Laboratory Control Sample/Laboratory Control Sample Duplicate = one per 20 samples SarDP-N.\ranrfp]Trojecti1B 635278\wApin&hsp\L 1iCPT zvkp.dor 214102