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30 June 2017 30 June 2017 AGE Project No.07-1529 AGE Project No.07-1529 Page 5 of 6 Page 6 of 6 flow restrictor,calibrated to 200 milliliters per minute(ml/min);a stainless-steel tee-fitting; 3.4. EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT two vacuum gauges at either end of the flow controller and connections for both purge and sampling canisters(manifold assembly).The manifold assembly will be attached to Prior to use,all sampling tools used for sample collection will be thoroughly rinsed with the'%-inch Teflon®tubing from the vapor sampling locations.The purge canister will be clean water after being washed with a solution of Alconox.All boring advancement tools attached to the end of the sampling manifold while the sample canisters will be attached will be cleaned prior to advancement at each boring location.Any soil or water waste to the tee-fitting between the tubing and purge container. generated during field activities will be containerized in properly labeled DOT-approved 55-gallon drums, and stored on-site in an area lacking public access. Disposal Leak tests will be performed on each manifold assembly by attaching and securing the alternatives will be evaluated based on results of soil and water analysis. 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. 3.5. REPORTING Each soil-vapor sampling location will be isolated from ambient air by enclosing the Reporting of the investigation will be included in a report of findings.The report will include borehole,tubing and manifold/canister assembly in a 100-liter plastic shroud,which will a description of work performed and the results of sampling. Conclusions and be weighted at the surface.Isopropyl alcohol(IPA)as a liquid will be placed in a stainless- recommendations will also be included in the reports, if applicable. The report will be steel bowl within the plastic structure and allowed to volatilize into the air enclosed within reviewed and signed by a California Professional Geologist. the plastic structure surrounding the borehole, tubing and manifold/canister assembly. Field measurements will be collected from within the shroud, using an OVM(PID; Mini Rae 3000),during the process,and recorded to determine if sufficient tracer compound is present(detected as the starting values). 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 well-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 an OVM(PID;Mini Rae 3000). Additional soil-vapor samples will be collected 4-6 months following the initial sampling if required by the CVRWQCB. Advmirrd G-Enriron m.]Inc. Advannd CcoEnv{mnmenlal Inc.