WORK PLANS - Laserfiche WebLink

Home Browse Search

09 January 2017 0 AGE Project No. 00-0769 Page 8 of 9 Leak tests will be performed on each manifold assembly by attaching and securing the sample and purge canisters to the manifold and opening the valve on the purge canister and the manifold. The leak test will be performed for approximately 3-5 minutes on each assembly. Each soil-vapor sampling location will be isolated from ambient air by enclosing the borehole, tubing and manifold/canister assembly in a 100-liter plastic shroud, which will be weighted at the surface. Isopropyl alcohol (IPA) as a liquid will be placed in a stainless steel bowl within the plastic structure and allowed to volatilize into the air enclosed within the plastic structure surrounding the borehole, tubing and manifold/canister assembly. Upon achieving a successful leak test, the purge canister valve will be opened for a calculated period of time to allow for a minimum of three calculated volumes of air to be purged. The purge canister vacuum gauge will be monitored to ensure a proper decrease of vacuum ensuring flow and purging. The purge volume will be determined by calculating the internal volume of the tubing and open borehole area. Upon achieving the targeted purge volume, the purge canister valve will be closed and the sample canister valve will be opened. The initial pressure and time will be recorded. Upon reaching at least -2 in Hg or less, the sample canister valve will be closed and final pressure and time recorded. The sampling port on the sampling canister will be capped with a brass end-cap. The samples will be transported under chain-of-custody procedure to a CDPH-certified laboratory. Each sample canister will be labeled with sample designation, time, date and sampler's initials and analyzed for the constituents listed in Section 2.3. Following sample collection, the total VOC concentration in the wells will be measured using a hand-held photo-ionization detector (PID; Mini Rae 3000). 3.4. EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT Prior to use, all sampling tools used for sample collection will be thoroughly rinsed with clean water after being washed with a solution of Alconox. All drilling rods will be cleaned prior to advancement at each boring location. Any soil or water waste generated during field activities will be containerized in properly labeled DOT-approved 55-gallon drums or a soil bin, and stored on-site in an area generally lacking public access. Disposal alternatives will be evaluated based on results of soil and water analysis. Advanced GeoEnvironmental Inc.