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I t ,. 16 1 1.0 INTRODUCTION On behalf of the Stockton Metropolitan Airport, Ramage Environmental has prepared this Groundwater Monitonng Report, Fourth Quarter 2004 for submittal to the San Joaquin County Environmental Health Division (EHD) and the Central Valley Regional Water Quality Control Board (RWQCB) The scope of work was completed according to Ramage Environmental's Work Plan, Environmental Site Investigation, dated September 5, 1997 On August 20, 2001, EHD approved the work plan 1 I Site Location and Description The site is an inactive aviation fuel farm located on the northwest corner of the intersection of C E Dixon Street and Lockheed Court within the Stockton Metropolitan Airport property in San Joaquin �} County, California (Figure 1) A total of 20 underground storage tanks (UST) have been removed from the site The locations of the former USTs are shown on Figure 2, and a list of the former tanks is included as Table 1 12 Previous Work 1 2 1 UST Removals Between August 1987 and May 1990, sixteen (16) USTs were removed from the site Twelve of the USTs (Tanks 1-12) were 25,000 gallon capacity tanks for the storage of aviation gasoline and ' het fuel, and were anchored to a concrete slab at a depth of approximately 16 feet below ground surface (bgs) One of the USTs (Tank 13) was a 12,000 gallon tank used to store unleaded gasoline Three of the USTs (Tanks 21, 22, and 23) were 1,000 gallon tanks used to store aviation gasoline and het fuel Soil samples collected from beneath the former USTs indicated that the soil beneath the fuel farm had been impacted by petroleum hydrocarbons The soil sample _ analytical results are summarized in Table 2 On June 19, 1997, RAH Environmental removed the four remaining USTs (Tanks CA-1, CA-2, CA-3, and Tank 14) Sod samples collected from beneath these USTs also contained petroleum hydrocarbons These soil sample analytical results are also summarized in Table 2 3