WORK PLANS - Laserfiche WebLink

Home Browse Search

27 March 2000 AGE.-NC Project No. 98-0450 Page I l of 19 certified laboratory for analysis for the Collowing constituents: • Total petroleum hydrocarbons quantified as gasoline (TPH-o) in accordance with EPA Method 8015 Modified and • Volatile aromatics (benzene. toluene. ethyl benzene and xylenes: 13TEX) and methyl tert- butyl ether (MTBE) in accordance with EPA Method 8020. Laboratory reports for vapor analysis. testim, methods, laboratory quality assurance/quality control (QA/QC) reports. and sample chain of custody doCltmentation will be presented in monthly reports. All analyses will be performed in accordance with the appropriate EPA methods. Darin« the --start- up" period for the SVE system. organic vapor may be monitored on a daily basis. The anticipated start-up period will be approximately one to two weeks. Vapor influent concentrations. vapor effluent concentrations and operational parameters - (combustion temperature. volume of processed vapor. oxygen level and the lower explosive limits will be monitored on a weekly basis to ensure optimal destruction of recovered hydrocarbon vapor and to monitor cleanup progress. The SVE/IAS system will be physically maintained on a weekiy basis according to tnanulaCturers recommendations (i.e. lubrication. oil changing. system adjustments, etc.). 4.7. PROPOSED IN-SITU AIR SPARGING SYSTEM An IAS system is proposed to operate in conjunction with SVE system at the site. The proposed IAS system would consist of an electric compressor to inject air into a valved piping network to air sparing well screens beneath the water table. Approximate air sparging well locations are depicted in Fiuure 6. A cross section ofthe site with well screen locations is depicted in Figure 7. The compressor will provide air at a variable rated of one to four cubic feet per minute (efm), at a pressure of approximately 15 pounds per square inch (psi) to each sparge point. Injected air will volatilize dissolved hydrocarbons in ground water and force hydrocarbon vapor into the vadose zone, where it can be withdrawn by the SVE system. The IAS compressor will operate independently from the SVE, unit. This will allow control ofthe air flow to the sparge wells and "surging" ofthe IAS system. if necessary, to prevent mounding and/or migration of the dissolved hydrocarbons. An electricity source for the IAS system will be available on site. Advanced(mUl"nv irnnmental. Inc.