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2i <br /> ,. Mr Paul Supple Project 24805-140 003 <br /> April 30, 1998 <br /> Page 3 <br /> RESNA began monitoring the groundwater in wells MW-1 through MW-4 on <br /> October 30, 1991 (RESNA, June 26, 1991, Report No 30004-4) Wells MW-5 and <br /> MW-6 were added to the monitoring program in March 1993 and December 1993, <br /> respectively Dissolved hydrocarbons have been detected in wells MW-1 and MW-5 <br /> since monitoring began Wells MW-2, MW-3, and MW-4 have intermittently contained <br /> low concentrations of TPHG and BTEX <br /> In March 1992, EA Engineering, Science and Technology (EA) observed removal of the <br /> oil-water separator/clanfier (EA, August 1992, Report No 80633 01) EA collected one <br /> soil sample from beneath the former oil-water separator and one sample from the <br /> concrete Analytical results from the soil samples indicated that oil and grease (quantified <br /> as total oil and grease [TOG]) were present Concentrations of volatile organic <br /> compounds, sernivolatile organic compounds, and polychlorinated biphenyls (PCBs) were <br /> below detection limits Total metals were also below detection limits, with the exception <br /> of arsenic and barium, which were detected at concentrations of 0 0051 and 0 12 parts <br /> per million,respectively <br /> On March 2, 1992, RESNA conducted a vapor extraction test at the site (RESNA, <br /> June 15, 1992, Report No 30004-5). Results of the test indicated that soil beneath the <br /> site can be remediated by vapor extraction, and the evaluated radius of influence was <br /> 30 feet <br /> In May 1994, RESNA submitted a problem assessment report (RESNA, May 11, 1994, <br /> Report No 30004-8) to the San Joaquin County Public Health Services (SJCPHS) and <br /> the California Regional Water Quality Control Board A final remediation plan will be <br /> prepared by Pinnacle, and subsequent remediation will be implemented in the future <br /> UST AND PIPING REMOVAL <br /> Henderson Construction (Henderson) obtained UST removal permits from the SJCPHS <br /> and provided UST and product delivery piping removal and excavation backfilling <br /> services Asphalt above the USTs and piping was removed and disposed of as <br /> construction debris <br /> Representatives of the Stockton Fire Department (SFD), SJCPHS, and Pinnacle observed <br /> UST removal on February 10, 1998 Henderson personnel inserted the USTs with <br /> approximately 30 pounds of dry ice per 1,000 gallons of capacity The SFD inspector <br /> approved UST removal when oxygen and lower explosive limit readings met UST <br />(40 removal guidelines <br /> sAC1N\PJM805\08051400 3FS-9ftzusmer 1 �� <br />