SITE INFORMATION AND CORRESPONDENCE

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4r � o Union Ice Company %WOO Quarterly Sampling Report, January, 1992 Page 4 west of the asphalt (see map, bio-remediation site, Union Street). The soils were inoculated with bacteria, kept moist and periodically mixed, using a tractor. Again, this work was performed by McCain Environmental Services. The treatment goal was 100 ppm or lower, which was more than achieved. Soil samples taken at the completion of the project were "none detected" for all consti- tuents. 10. Pump testing of the aquifer occurred on March 2, 1991. Well #8 was pumped for a 12 hour period at 4.16 gpm; total water removed form the aquifer was 3,000 _ gallons. All of the data from the pump tests has been reported in previous reports. We have produced an additional graph for this report, at the County's request, showing the draw down effect on the surrounding wells (Appendix E). Confusion regarding ground water contamination persists. Because no significant contamination has been found in any of the wells, we believe two things: first, sig- nificant ground water contamination never occurred; second, we believe that the pumping of the 3,000 gallons of water during the pump test probably removed the contaminated water. We feel this is a reasonable explanation based u_Don the analytical results observed over the last three (3) years. Subsequent to this project, soils were re-excavated from the 1320 Weber Avenue site. Approximately 800 yards of contaminated soil was excavated from the former fuel tank area. Contamination was gasoline, where the average: concentration was 69 ppm by weight. Again, a permit was obtained from the APCD; the permit stipulated that no more than 486 cubic yards per day could be aerated.. The aeration took approximately 60 days to complete. Aeration was again performed by McCain Environmental. The area where aeration was performed is shown on the Soil Remediation Activities map (Weber Avenue Aeration). Following aeration, samples were taken with results showing "ND". Some mixing of the Union Street and Weber Avenue soils occurred after aeration activity. Since all soils were tested as "ND", this was not considered to be a problem. Results of these activities have been reported in previously submitted reports.