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GeoCogicaf?echnics Inc. Page 4 Project No.: 646.2 Hayres(Manthey) Tank Investigation Report June 26, 1998 5.0 DOMESTIC WELL The domestic well is located immediately on the west side of the shed, which is north of the former 10,000 gallon USTs. This well happens to be located between the contamination sourced from the septic tank and the 10,000 diesel AST. Test results show that nitrates and Coliform bacteria are below the detection limits. However, both oil and gasoline compounds were found in this water sample while the oxygenated fuel compounds were not detected. Reportedly this well was installed at the time the house and shop (which was the original egg processing building). The lab data reports are attached in Appendix A-3 and summarized in Table 2. 6.0 RETENTION POND SOIL A storm water retention pond (Pond) is located immediately west of the west hen house. It receives storm water run-off from this facility. Excess storm water used to be pumped out of the Pond into an old irrigation pipe and then out to the fields west of this Property. This irrigation pipe is the same as the one used by the sump. Two samples were collected at a depth of one-foot using a shovel. 1. Sample (SWP-West) was collected on the west side of the pond where the drainage from the maintenance area enters the pond. 2. Sample (SWP-East) was collected in the deepest portion of the pond near the pump-out sump. Test results show that motor oil was found to be in the soil at a depth of one foot, while gasoline compounds were not detected. The lab data reports are attached in Appendix A-4 and summarized in Table 1. 7.0 CONCLUSIONS AND RECOMMENDATIONS Conclusions The following conclusions can be drawn from the data gathered during this investigation: 1. 1.000-gallon USTs - Testing of the soil and groundwater under the two former 1,000- gallon USTs, which were located east of the pump island, demonstrate that these two tanks have not caused a 'sianificant contamination problem. Only a trace amount of MTBE is present at 10 feet and only a minor amount of diesel was found in the stockpiled soil. 2. 10.000-gallon USTs - Testing of the soil and groundwater under the two 10,000-gallon USTs show that they have not caused a contamination problem. 3. Septic Tank - Testing of the soil under the former septic tankileach line system, located on the eastern end of the former 10,000-gallon underground tanks, showed that the former septic system has caused a gasoline contamination problem. Refer to the lab data for sample TK 10,000 E 10'. Chlorinated cleaning solvent compounds were not detected.