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21 June 2018 AdvancedGeo <br />AGE Project No. 11-1847 Environmental <br />Page 5 of 8 'Ogg <br />sample collection will be thoroughly rinsed with clean water after washing with a solution <br />of Alconox. All hollow stem augers will be steam-cleaned prior to advancement in each <br />borehole. Selected soil samples will be be analyzed by a State of California Department <br />of Health Services (DHS)-certified laboratory for the following constituents: <br />Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and <br />TPH-d, respectively) in accordance with EPA Method 8015 Modified; <br />Benzene, toluene, ethylbenzene and xylenes: BTEX compounds, methyl tertiary <br />butyl ether (MTBE), tertiary amyl methyl ether (TAME), di-isopropyl ether (DIPE), <br />ethyl tertiary-butyl ether (ETBE), tertiary butanol (TBA), 1,2-dichloroethane (1,2- <br />DCA), ethylene dibromide (EDB) and Naphthalene by EPA Method 8260 Modified. <br />Laboratory reports for soil analysis, testing methods, laboratory quality assurance/quality <br />control (QA/QC) reports, and sample chain of custody documentation will be presented <br />in a report with findings and recommendations. <br />3.3. SOIL VAPOR EXTRACTION WELL COMPLETION <br />Each SVE well will be completed as a single-casing well utilizing 4-inch diameter schedule <br />40 polyvinylchloride (PVC) 0.030-inch slotted well screen and blank well casing. Based <br />on geologic conditions, a 15-foot length of well screen from 10 to 25 feet bsg is anticipated <br />for installation of each SVE wells. <br />After installing each well casing, a filter pack material consisting of coarse-grained <br />aquarium gravel will be added over the screened interval to approximately two feet above <br />the screened interval. <br />A nominal two-foot bentonite seal (bentonite chips) will be placed above the filter pack to <br />minimize the potential for grout penetration into the screened section of the well. The <br />bentonite seal will be formed by pouring bentonite chips into the annulus and allowing <br />them to settle on the filter pack. The bentonite chips will be hydrated using approximately <br />five gallons of tap water and allowed to hydrate for a minimum of one-half hour prior to <br />grouting. <br />The remaining annular space will be filled to the ground surface with a cement grout. The <br />grout mixture will consist of Type I/II Portland neat cement and not more than 6 gallons <br />of water per 94-pound sack of cement. The grout will be placed by pumping through <br />tremie pipe. <br />A diagram for the proposed construction of SVE wells VW-1, VW-2 and VW-3 is depicted <br />in Figure 9.