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• 25 August 1997 AGE-NC Project No 95-0173 Page 4 of 6 screen from 35 to 40-feet bsg A #3 Lonestar Lapis Luster sand will be poured down the annulus between the well casing and the inner wall of the hollow stem auger The filter pack will be placed adjacent to the screen(0 020 inch screen size) from the bottom of the boring to a point approximately 2 feet above the top of the screen A five foot interval of bentonite will be placed above the filter pack and will serve as an annular seal Portland Type II cement will be utilized to grout from the annular seal to surface grade The proposed IAS well construction diagram is included as Figures 3 - Pi oposed Iii-situ Air Spaiging Well Design 3 4 LABORATORY ANALYSIS The PHS-EHD will be given an opportunity to review soil samples prior to any laboratory analysis Selected soil samples will be analyzed for total petroleum hydrocarbon quantified as gasoline and diesel(TPH-g and TPH-d), volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTE&X) and methyl-tertiary butyl ether (MTBE) in accordance with EPA methods 8015m, 8020 and 8260 Laboratory reports from the soil analysis, testing methods, laboratory quality assurance/quality control (QA/QC) reports and sample chain-of-custody documentation will be presented in a Corrective Action Report with the findings and recommendations 3 5 IN-SITU AIR SPARGING PILOT TEST Following the IAS well installation, an IAS pilot test will be performed in order to determine remedial feasibility at the site IAS field parameters and analytical results will facilitate the design of an IAS system and will be used to determine the spacing and number of IAS wells For performance of an in-situ air sparging (IAS) pilot test, a compressor driven unit will be used to inject air into the subsurface via the IAS well Data collected during the IAS pilot test will be used to determine if IAS is a feasible remedial option for this site The IAS pilot test will be operated for a period of 72-hours (3 days) Several parameters, including radius of influence, sparging rate, sparging vapor concentrations, ground water depths and dissolved oxygen will be measured at regular intervals RP,;iiltc of the TAS nilnt te-0 will hi- inrl,irlarl inn r A A 40 PROCEDURES 41 DRILLING AND SAMPLING The following procedures will be performed for the advancement of soil borings Advanced GeoEm ironmentai,Inc