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Chevron <br /> � <br /> ATTACHMENT Chevron <br /> r <br /> Chronology of Site Environmental Activity <br /> 5167: 4 steel tanks installed;5000 gal. (sup.), 2-10,000 gal. (unl. & reg.), 1,000 gal. (w o.) <br /> 8/86: Fuel line leak discovered during routine maintenance. <br /> 10186: Fuel line replaced <br /> 10/2-3/86: Groundwater Technology,-Inc. (GTI) installed wells MW-1, -2, and MW-3. <br /> 11117/86: GTI report; Re rt of Subsurface Investigation, describing well installation. <br /> 11119187: EA Engineering, Science,-and Technology, Inc. (EA) conducted soil vapor survey. <br /> 12/17187: EA report; Report of Investigation, describing soil vapor survey. <br /> 1119-22/88: Weiss Associates(Weiss) installed wells MW-4, -5, -6, and MW 7. <br /> 3128188: Weiss report(untitled) describing well installation. <br /> 919188: 4 original steel tanks removed. 4 dbl.-wall fiberglass replacement tanks installed: <br /> 3-10,000 gal. (prem. &unl. & reg.), 1,000 gal. (w.o.) <br /> 9112188: Blaine Tech Services report;Tank Removal Sampling Report, describing tank removal <br /> operations and soil sampling. <br /> 318-10/90: Dames and Moore installed wells MW-2A, 4A, and MW-8. <br /> 4/2-4/90: Dames and Moore installed wells MW-5A, -9, -10, and MW-1 1. <br /> 7110190: Dames and Moore report(untitled),describing wellhead reconstruction of wells MW-1 <br /> through MW-7. <br /> 1015/90: Dames and Moore report; Groundwater Contamination Assessment,describing well <br /> installation. <br /> 3116/93: Service station abandonment. 4 dbl.-wall fiberglass tanks and piping removed. <br /> 3/31/93: Touchstone Developments(Touchstone) report;Underground Storage Tank and Line_ <br /> Removal Report, describing tank removal operations and associated soil sampling. <br /> 4123-27/93: Performed soil overexcavation/remediation. <br /> 5/11-20/93: Continued soil overexcavation/remediation. <br /> 6115193: Touchstone report; Soil Excavation and Remediation Report, describing soil I <br /> overexcavation, sampling,`and remediation operations. <br /> 812-5/93: GTI abandons wells MW-1, -2, -2A, -3, -4, -5, -5A, and MW-6. <br /> 8130193: GTI interim report describing soil sample results associated with well abandonments. <br /> 9113-14/93: GTI abandons wells MW-8 and MW-9. <br /> 10114193: GTI report(untitled) describing quarterly groundwater monitoring.and well <br /> abandonment activities. <br /> i <br /> Aecyctab;e <br />