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oil from the facility to an approved disposal company. Dates and quantity removed will be recorded and included in the quarterly monitoring reports. 4 . All groundwater monitoring wells will be sampled and analyzed quarterly. Analyses will include total petroleum hydrocarbons as diesel, oil and gasoline (TPHg, TPHd and TPHo) by EPA Method 8015 . The groundwater samples will also be analyzed for benzene, toluene, ethylbenzene and total xylenes (BTEX) by EPA Method 8020, and Methyl tert- Butyl Ether (MTBE)/oxygenates by EPA Method 8260. 7. 0 EXCAVATION OF SOIL BORINGS AND SOIL SAMPLING Environeering, Inc. will oversee two (2) soil borings, B -6 and B-7, as stated in the Work Plan dated 1 May 2000 . A registered geologist who will prepare boring logs will supervise the soil borings and the necessary boring permits will be obtained as needed. In addition to these two borings, a third boring will be advanced. This boring (MW-4) will be converted to a 24nch groundwater monitoring well, constructed of 2-inch flush threaded Schedule 40 PVC casing, up to a maximum of 20 feet of 0 . 001 -inch or 0 . 002-inch factory slotted well screen. The top of the screen will extend up to three feet above the encountered groundwater level to account for seasonal fluctuations. The well casing will be inserted through the augers to a point a few inches above the borehole terminus where it will be suspended until the well is secured within the sand pack. Sand (#2 or #3) will be poured through the augers in one- to two-foot lifts up to about two feet above the top of the perforated casing. One- to two- feet of bentonite pellets will be placed above the sand, and activated with tap water. The bentonite plug will be set above the filter material to prevent the grout from entering the filter pack. The seal will be finished up to the surface with tremmied cement/bentonite grout. A locking top cap and mounted watertight well cover will be installed . The well will be developed by swabbing and bailing water into a DOT 17H drum until the water appears to be reasonably clear with a minimum of ten ( 10) well volumes removed. The groundwater will then be checked for sheen and free product prior to purging and sampling. As stated in the Work Plan dated 1 May 2000, all borings will be advanced using a nominal 8- inch diameter truck mounted hollow-stem auger. Evacuated soils will be monitored for the Environeering, Inc. Project No. 00-005.05 Page 6