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Mr Harlan Knoll, REHS 4 July 24, 1992 Following sample collection, the sal-vapor probe will be removed using the hydraulic ram The probe hole will be backfilled as required. A letter report will be prepared to summarize the results of the soil-vapor survey. This report will include the proposed placement of soil borings and monitoring wells for Phase II activities. Phase II - Drilling Program Based upon data collected to date, the proposed Phase II program includes the Installation of approximately four Investigative soil borings which will be advanced to a minimum depth of 50 feet. The locations of these soil borings will be proposed in the Soil Vapor Survey Letter. All of the soil borings will be converted to ground water monitoring/vapor extraction wells, as appropriate (ground water depth Is expected to be below 50 feet). Canonie proposes to use a truck-mounted flight auger rig for the drilling program. This rig uses hollow stem augers and can be sampled with either a split spoon sampler or a dry core system For the current sampling scheme, it is assumed that split-spoon sampling will be used. Over drilling the boring with a 10 or 12-inch diameter auger will provide sufficient annular space for a 4-inch diameter well During drilling and well installation, a Canonie engineer/geologist will supervise the drilling subcontractor, log the soil samples and drill cuttings, and obtain samples for screening and chemical analyses Samples for chemical analysis will be obtained from a minimum of two discreet intervals per soil boring and at any changes in lithology, as designated by the field engineer or geologist Samples will be collected in a split-spoon sampler lined with brass tubes. These samples will be field screened for the presence of volatiles using a Photo-Ionization Detector (PID), or equivalent The ends of the brass tubes will be wrapped with aluminum foil and covered with plastic caps. The brass tubes will be 1 labeled and sealed in a ZiplocTM' bag. Samples taken for chemical analyses will be labeled with the sample location, depth Interval, date, lob number, and sampler's initials. Each sample will be recorded on a chain-of-custody form which will be maintained with the cooler Samples collected will be placed Immediately in a cooler with ice, and transported the same day to the laboratory for analysis, when possible. The ice pack in the cooler will be replaced with a fresh ice pack before transportation. Sotl samples will be analyzed for TPH-G by EPA Method 8015 (modified), BTEX by EPA Method 8020, and EDB by AB 1803. All down-hole equipment will be steam-cleaned prior to each boring, and the split- spoon sampler will be washed in a solution of trisodium phosphate (TSP), or equivalent, and rinsed with potable water between each sample run. All soil cuttings PL191-6341REPORTSIKNOLL RPT[July 22, 19921 CanoftleEnvlronmental