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1 ''� •t�' `" �.ofz-,�� +.v� �c.�r `L"��'"��� �� `�' � mss,,, �^. yati" ��";r� as ,.�y,, �,g <br /> 5L .' , P}' ✓� 5.6 •� "M]r'K. �'," .+5 �R. I$. 7T 3 'i':l ',� 4 Yr.; <br /> rgjM T. <br /> Vi <br /> F <br /> A <br /> a " <br /> FMD MEMODS <br /> Yap <br /> A schematic diagram of a vapor-extraction well is shown on Plate P-3. The wells will be <br /> constructed of thread jointed, 4-inch-diameter schedule polyvinyl chloride (PVC) casing. <br /> No chemical cements, glues, or solvents will be used in well construction. The screened <br /> portion of the wells will consist of factory-perforated casing with 0.020-inch-wide slots. <br /> The interval between 10 and 25 feet below grade will be screened using slotted casings. <br /> No. 3 sand will be placed in the annular space opposite the screen to approximately 1 <br /> foot above the top of the slotted casing. A 2-foot bentonite plug will be placed above <br /> the sand pack, and a cement-bentonite slurry will be used to fill the remaining annulus to <br /> the surface. <br /> A traffic-rated cast-aluminum utility box with a PVC apron will be placed over each <br /> wellhead and set in concrete flush with the surrounding concrete pad. The box has a <br /> watertight seal to protect against surface water infiltration and is opened with a special <br /> wrench. The design of the box discourages vandalism and reduces the possibility of <br /> accidental disturbance of the well. <br /> Va o ,Moron Tei; <br /> The vapor-extraction test has two objectives: (1) to collect operational data to evaluate <br /> the efficiency and practicality of vapor extraction as a soil remediation alternative and <br /> (2) to select the most appropriate oft-gas treatment alternative, if the operational data <br /> suggest that vapor extraction is recommended. Applied GeoSystems will perform the <br /> vapor-extraction test in accordance with San Joaquin County Air Quality District <br /> guidelines. <br /> A portable vapor-extraction system will be transported to the site and operated as <br /> required to obtain vapor samples and vacuum pressure and flow rate information. <br /> Vapor samples will be collected into sample bags at the inlet and outlet of the vapor~ <br /> extraction test system and submitted to a State-certified laboratory for analysis of TPHg <br /> and BTEK Chain-of-Custody protocol will be followed throughout field and laboratory <br /> procedures. <br /> AIDPIied GeoSystems <br />