SITE INFORMATION AND CORRESPONDENCE

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f � - CHRONOLOGY PACIFIC BELL UE042 345 NORTH SAN JOAGUIN STREET, STOCKTON CA 95202 SITE CODE: 1867 The site is located on the southwest intersection of San Joaquin St and Lindsey Street. The San Joaquin County APN is 139-140-01 . The site encompasses one-half of a block and contains communication equipment for Pacific Bell and AT&T. Two underground storage tanks that were located in the basement were closed in-place on December 17, 1990 because underground structural supports prevented their removal and remediation of the soil contamination evidenced. Three underground storage tanks were removed on November 10, 1993 from the sidewalk area north of the site and an excavation attempted to remove the soil contamination. Residual soil contamination continued to be evidenced and following further characterization. It was determined that the residual soil contamination would not pose a threat to groundwater quality. In 1991 three groundwater monitoring wells were installed and limited groundwater contamination was evidenced. PHSIEHD has reviewed all site conditions and has determined that site closure/certification is warranted. 1990 06/11/90 Soil borings in the area of the underground storage tanks located in the basement to investigate the possibility of an unauthorized release associated with the operation of the tanks. Soil contamination evidenced. See the attached summary of basement soil sample analytical results for soil borings: SS1 - SS4 . 12/17/90 Two underground storage tanks were closed in-place. Tank #3 was a 300 gallon diesel tank and tank #4 was a 550 gallon diesel tank. 1991 1217191 Drilling was initiated to install monitoring wells, MW1 - MW3 to investigate groundwater quality impacts which may have resulted from the soil contamination evidenced on June 11, 1990. See the attached summary of soil sample analysis results December 7 and 8, 1991 and the boring logs for MW1 -MW3. 12/12/91 Groundwater quality data collection was initiated. See the attached historical water level data summary and the summary of groundwater sample analytical results (Dec 1991 - Juiy 1994). 1.992 Groundwater monitoring and sampling continued. 1993 02/03/93 Additional soil investigation was continued by International Technology. Note: PHSIEHD maintained that additional soil investigation was necessary in the basement area to define the extent of soil contamination evidenced. Six soil borings were drilled and sampled with grab groundwater samples also collected for analysis: SB1 - SB6. See the attached summary of soil sample analytical results, groundwater sample analytical results and boring logs.