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1 In order to assess the requirements of bioremediation, a treatability study conducted with heavily ' impacted soil samples obtained from the site was conducted from January 18 to March 15, 1990, and the results included in the Workplan The nutrient and moisture requirements as well as the time needed to degrade diesel to the cleanup objective, 100 mg/kg TPH/D, were estimated based on the results of the ' treatability study and included in the Workplan The on-site treatment of excavated soil is described in Section 4 2 of this report ' 2 6 APPLICATION FOR PERMIT TO CLOSE UNDERGROUND STORAGE TANKS STORING HAZARDOUS MATERIALS ' Following demolition of the maintenance shop and soil excavation, treatment and disposal, and ' Mr Marvin Palmer of AM&M was contacted by PHS-ESD, in January, 1991 The PHS-EHD stated that after reviewing their files, the underground pipe connecting the 10,000 gallon diesel UST to the pump island had not been removed The PHS-EHD requested that the pipe be removed and decontaminated ' under the supervision of a PHS-EHD representative, in order to close the UST, and enclosed PHS-EHD's "Application for Permit to Close Underground Storage Tank Containing Hazardous Materials" AFPC submitted the completed application including pertinent figures, soil sampling and analytical plan and a Health and Safety Plan consistent with the county requirements to the PHS-EHD and the RWQCB on April 12, 1991 (Dames & Moore, 1991) The application was received and verbally approved in early May 1991, and work began in mid-June, 1991 Details of the removal, decontamination and disposal of the underground piping are describe below in Section 4 2 ' 2 7 GROUNDWATER MONITORING As discussed in previous sections, JHKA installed three groundwater monitoring wells (MW-1, MW-2, and MW-3, Figure 2 1) in the vicinity of the maintenance shop Groundwater samples were ' collected by Kleinfelder in July of 1987 and analyzed for volatile organics (EPA Method 602), phenols (EPA Method 604), polynuclear aromatic hydrocarbons (EPA Method 610) and TPHID (EPA Method ' 8015) None of the above listed constituents were detected in the groundwater samples (Appendix B) On June 13 and 15, 1988, and on January 31, 1989 Dames & Moore measured water levels and ' sampled groundwater from the three JHKA monitoring wells under a workplan approved by the PHS-EHD The results of the January 31, 1989 sampling were reported to PHS-EHD in a letter report ' included in Appendix E The overall groundwater gradient was relatively flat (0 0015 to 0 0016 feet per linear foot), and groundwater flow direction was toward the north/northwest There was also a distinct drop in water levels, as two of the three JHKA wells could not be sampled in June 1988, as the water level had dropped approximately 10 to 15 feet since the wells were installed in July 1987 5AC36 046 9 I