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� ♦ s EMIR, Mr. James Barton March 31, 2005 Page 2 converted sparge wells will be in the lower aquifer zone (zone C) identified in previous reports at approximately 86 to 91 feet below ground surface (bgs). The locations of the proposed air sparge well (AS-33) and the existing monitoring well (MW-23S) are illustrated on Figure 2. Figure 3 shows the locations of future work and the existing and proposed conveyance piping. Air sparge well AS-33 will be advanced using a truck-mounted drill rig employing 10-inch diameter hollow stem augers. The well will be drilled to an approximate depth of 91 feet bgs. Soil samples will be collected at five-foot intervals to the total depth drilled using a split spoon sampler. Soil samples collected will be field screened for the presence of volatile organic compounds (VOCs) using a photoionization detector (PID). Soil samples will also be logged according to visual and manual methods. PID readings, soil descriptions, and other pertinent drilling information will be recorded on the boring logs. Soil samples for chemical analyses will be collected in brass liners, capped with teflon tape and plastic end caps, and then placed in re-sealable plastic bags. The brass liners will then be stored in iced coolers and transported to a state-certified laboratory under chain-of-custody documentation. Selected soil samples will be analyzed for TPHg using EPA Method 8015M, BTEX, MTBE, EDB, and 1,2-DCA using EPA Method 8260B. Samples will be selected for laboratory analysis based on PID readings, sample depth, and soil lithologic data. A minimum of one soil sample from the boring will be submitted for chemical analysis. Field methods and procedures to be used by ENSR during drilling and installation of the proposed well are summarized in Attachment B. The air sparge well will be constructed using 2-inch diameter, flush-threaded, Schedule 40 PVC casing. The casing will be installed to a total depth of approximately 91 feet bgs. The air sparge well will be screened from 85 to 90 feet bgs. Final screened intervals will be based on field observations. The annular space will be filled with No. 3 Lonestar—or equivalent—sand (filter pack) from two feet above the top of the well screen to the maximum depth of the well. A minimum 2-feet thick bentonite seal will be placed on top of the filter pack. Above the bentonite seal the annular space will be sealed with neat cement grout. Proposed well construction details are presented in Attachment C. Spari Well Connection Conveyance line installation includes trenching, bedding, piping installation, connection to the wells, backfilling, and compaction. The trenches shall be approximately 1-foot deep by 1-foot J:1PmjectsT694015098-2931WorkinglReports15098 Work Plan 2AS wells.doc `' Celebrating 35 Years of Excellence in Environmental Services