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30 December 2011 AGE-NC Project No. 95-0106 Page 3 of 4 Additionally, at the time of indoor air sampling a Building Survey Form will be completed. The Building Survey Form presented in Appendix L of the DTSC-prepared, Guidance For The Evaluation And Mitigation Of Subsurface Vapor Intrusion To Indoor Air- Final(Vapor Intrusion Guidance) dated October 2011 will be utilized; a copy of the Building Survey Form is presented in Appendix D. All field procedures will be overseen by an AGE representative under the supervision of a California Professional Geologist. AM 5 2.2. COLLECTION AND ANALYSIS OF AIR SAMPLES AGE proposes to collect two indoor air samples, three crawl space'samples, and three ambient air samples from the residence at 104 West Beverly Placey'fracy, CA. Indoor air samples will be collected from the main living area and main bedroom inside the residence; crawl space samples will be collected from the northeast corner, northwest corner, and _ southern portion of the crawl space beneath the residence; and three ambient air samples VJ will be collected from the east, west, and south areas of the Backyard of the residence (evaluating the migration of soil-vapor). ,n 1+1 Z tip'- "� -4-4 \o 10d All air samples will be collected in six-liter Summa canisters using passive integrated sampling procedures. Each canister's initial vacuum will be measured and recorded to ensure the initial vacuum is greater than 25 inches of mercury (in hg). The sampling inlet on the canisters will be connected to a mass flow controller containing a particulate filter and calibrated to 3.8 milliliters/minute (ml/min). Air samples will be collected over a period of approximately 24 hours based on the calibrated flow of 3.8 ml/min. At-%,mak m;•, For indoor air samples, Summa canisters will be placed approximately 3-5 feet above the ground surface in the breathing zone. The Summa canister will then be opened to begin air sample collection. -.c 4* For crawl space air samples, polypropylene tubing (PPE) or equivalent tubing will be r aooE connected to the mass flow controller inlet and inserted horizontally into the crawl space ^ may fir, PI through a foundation vent or the crawl space access area to the desired location. The Vk n Summa canister will then be opened to begin air sample collection,. 1 `.�� ,/ 11T(� For ambient air sample , Summa canisters will be placed approximately 10-15 feet from the residence and 2-3 feet above the ground surface. The Summa canistervill then be opened to begin air sample collection. Proposed air sampling locations are depicted in Figure 2. IAO ' via g Advanced CeoEnvironmental,Inc.