SITE INFORMATION AND CORRESPONDENCE

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Mr. James Brathovde April 30, 1990 Page 3 Work Plan The following work plan was developed by ESE to assess the extent of hazardous materials in the soil and ground water at the site: 1) Establish a two-dimensional sampling grid for the previously excavated and stockpiled soil based on collecting six soil samples per 1,000 cubic yards of material for an estimated total of 30 samples. Samples will be analyzed for Total Petroleum Hydrocarbons (TPH) as gasoline and diesel using EPA Method 8015, Total Lead using EPA Method 7420, and Soluble Lead using Waste Extraction Tests. At least four of the samples will also be analyzed for Volatile Organics (EPA Method 8240), Semi-Volatile Organics (EPA Method 8270), and the 17 CAM Metals. 2) Excavate and sample the remaining soil and rubble in the excavation. One soil sample will be taken for approximately each 50 cubic yards of material removed and sent to a State-certified laboratory to be analyzed for TPH and total and soluble lead. At least one sample in every ten will also be analyzed for volatile organics, semi-volatile organics, and metals. It is estimated that approximately 500 cubic yards of soil will be removed and 10 samples will be taken and analyzed. There may be considerably more material to be excavated. 3) Obtain soil samples from the sidewalls at approximately 20-foot intervals near the base of the walls and in the center of the excavation as shown on Figure 1. These samples will be taken after clearing out the excavation in the above task. An estimated 32 samples will be taken and analyzed for TPH and total and soluble lead as described above. At least four samples will also be analyzed for volatile organics, semi-volatile organics, and metals. Samples will be collected from the excavator bucket. 4) Install three 4-inch diameter ground-water monitoring wells at the locations shown on Figure 1. Soil samples will be taken at 5-foot intervals and described by a geologist. Laboratory analyses will be performed on samples at 5-foot intervals down to 30 feet and at 10-foot intervals thereafter until ground water is reached. Ground water is expected at approximately 70 feet, it is estimated that a total of 10 soil samples will be analyzed from each well for TPH and total and soluble lead. In addition, the samples from 10, 20, and 30 feet will also be analyzed for volatile organics, semi-volatile organics, and metals. The monitoring wells will be drilled and screened at least 20 feet beyond the fust ground water found. The wells are expected to be 90 feet deep. At least 24 hours after the wells are constructed, they will be surveyed relative to each other and the water level measured in each. Ground-water samples will be obtained from the wells after each is developed by purging three to five well volumes of water. Purge water will be stored in drums on site. Water samples will be analyzed for TPH, total and