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Chronology <br />7759 S. Airport Way Stockton CA <br />(Formerly 5503 S. Airport) <br />Site Code: 1798 <br />The site is located within the City of Stockton with APN 177-260-05. The property is <br />owned by San Joaquin Mosquito and Vector Control District and is used as the main <br />headquarters for the District. Six underground storage tanks were removed and <br />replaced by four underground storage tanks. Soil contamination was evidenced at <br />the time of tank removal which was followed by limited excavation. The extent of the <br />soil contamination was determined through soil borings and the installation of three <br />monitoring wells. Groundwater contamination above primary or secondary California <br />Maximum Contaminant Levels was not confirmed. The on site facility well was tested <br />and contamination was not detected. PHSIEHD recommends the site for closure <br />based on the limited amount of residual soil contamination, the depth to groundwater, <br />and the recommendation of California Registered Geologist, Karla Brasaemle, with <br />Weston at the time of closure evaluation. <br />1987 <br />3/13187 Four underground storage tanks were removed and soil samples <br />collected. Contamination was observed associated with the tanks. Soil <br />excavation was initiated in the areas of obvious soil contamination and <br />samples collected. (See the tank summary and the Soil Analytical <br />Results Summary ) <br />418187 Soil excavation was completed and soil samples collected for <br />confirmation. <br />5129187 Two additional underground storage tanks were removed and soil <br />samples collected. Contamination was not detected associated with <br />these tanks. Note: the tanks that were removed this date have been <br />identified as UT -1 and UT -2 and were registered as 1798-05 and 1798- <br />06. <br />1994 <br />7126194 The soil and groundwater investigation to determine the extent of <br />contamination was initiated. Seven soil borings were drilled and <br />Sampled, three of which were converted into monitoring wells. <br />Monitoring wells Construction: <br />all screened between 43 and 63 feet. <br />Soil samples were not collected for laboratory analysis during the <br />installation of the monitoring wells. <br />