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Geological Technics Inc. %W Page 3 Project No.: 646.2 Hayres(Manthey) Tank Investigation Report June 26, 1998 3. The septic tank was decommissioned about 25 years ago. 4. The contamination was found in the area suspected as bein- the area of the septic tank leach line. The lab data reports are attached in Appendix A-1 and summarized in Table 1 & 2. 3.0 ABOVEGROUND STORAGE TANK Gabriel, the plant maintenance supervisor, was contacted and he informed GTI that there had been a 10,000-gallon aboveground diesel storage tank (AST) west of the domestic well next to the power pole with the fire extinguisher and warning light. A trench was dug starting on the south side of the power pole and extending south approximately 15 feet. Immediately starting at ground surface there was evidence of diesel contamination. Soil staining and diesel petroleum odor was very strong in the upper several feet. However, at the excavation depth of 10 feet, the chemical concentration appeared to have decreased. Test data showed high concentrations of diesel, low concentrations of gasoline, and trace concentrations of xylene in the soil sample collected at 10 feet. The groundwater sample was shown to have similar concentrations. The data suggests that this 10,000 tank also contained some gasoline during the course of it operation. The lab data reports are attached in Appendix A-1 and summarized in Table 1 & 2. 4.0 SUMP A wastewater sump is located on the east side of the egg processing building. An automatic float switch turns a pump on and the water is pumped out of the sump into an old irrigation pipe and then out to the fields west of this Property. A water sample was collected and tested for TEPH and Solvents and found to contain low concentrations of motor oil. No solvents were present. On June 15, 1998, the water and some of the sludge was pumped out. It was discovered that the sump is vary large and actually has two chambers. A pipe connects these two chambers about half way to the bottom. The primary chamber of the sump is approximately 8 feet deep and the bottom contains one to two feet of dirt and oily sludge. A concrete slab covers the second chamber. Since there is no lid, an inspection could not be made and the structure and contents of the second chamber are unknown. The lab data reports are attached in Appendix A-2 and summarized in Table 2.