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CHRONOLOGY <br /> CITY OF STOCKTON FIRE STATION 2 <br /> 110 SONORA, STOCKTON <br /> 04/01/87 A 1000 gallon gasoline underground storage tank (UST) (Tank 1) <br /> was removed this date from near the southwest corner of the fire <br /> station building. The Environmental Health Department (EHD) <br /> inspector noted there were holes in the side of the UST and <br /> gasoline odor to soil. The soil sample collected beneath the UST <br /> confirmed petroleum contamination. <br /> 08/07/87 A 1000 gallon unknown UST (Tank 6) was removed from the <br /> southeast corner of the parcel on this date. Low levels of kerosene <br /> and motor oil were found in the soil samples collected from beneath <br /> the UST. <br /> 05/23/88 A Notification of Hazardous Waste Discharge and an Unauthorized <br /> Release Report were filed this date. <br /> 12188 Monitoring wells MW 1 (screened from 34 — 54 feet), MW2 <br /> (screened from 25 —54) and MW3 (screened from 25-54 feet) were <br /> installed. Groundwater contamination was confirmed. <br /> 03/07/90 Date site was placed in the Local Oversight Program. <br /> 0517-8190 Four soil borings (B4-B7) were drilled to a total depth of 35.5 feet <br /> and MW4 (screened 30-55 feet) was installed during this time. <br /> 11/26/90 Date EHD received a Problem Assessment Report that includes the <br /> work done in December 1988 through August 1990. MW 1 was <br /> installed near the former location of Tank 1 and had high OVA <br /> readings from 15 feet to 35 feet. Soil samples from MW 2 — MW4 <br /> and borings B4 — B7 had no detections of contamination. The PID <br /> readings were zero except B5 (the sample at 30 feet had a reading <br /> of 20 ppm but analysis was non detect). Soil contamination was <br /> found from 10 to 25 feet in former Tank area. Groundwater at 25 <br /> feet appears to have spread the contamination. <br /> 04/23/92 A 500 gallon waste oil UST (Tank 4) was removed from the site this <br /> date. Soil samples from beneath the UST were non detect. <br /> 8128-913192 Installation of RW-1 (screened 45 — 60 feet), PZ-1 (screened 39.5 — <br /> 59.5 feet), VW-1 (screened 15 — 30 feet), VW2 (dual screened 10 - <br /> 30 feet and 34 — 41 feet), VW3 (screened 15 — 30 feet) occurred <br /> during this time. VW2 was placed in the former Tank 1 area and <br />