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%.I �I Harding Lawson Associates March 26, 1993 23343 001 John Breuner Company Mr. Peter Meier Page 2 investigation were presented in an HLA report dated September 30, 1991. On November 12, 1991, Breuners submitted the report to the SJCEHD, accompanied by a letter requesting site closure. In a letter to Breuners dated August 31, 1992, the SJCEHD indicated that the soil proposed to be left in place was within allowable guidelines and the site was eligible for closure. The SJCEHD also indicated that a FRP was required in order to obtain approval for closure. The FRP was to include documentation of soil disposal and excavation backfilling activities as well as a request for closure. STOCKPILING SAMPLING AND DISPOSAL On February 17, 1993, HLA collected four soil samples from the approximately 50 yards of stockpiled soil at the site. Each sample was collected by removing approximately 1 to 2 feet of surface material from the stockpile and inserting a clean stainless steel tube until the tube was completely filled. The tube was then removed and the ends covered with Teflon-lined plastic caps. The samples were labeled and placed in a cooler with blue ice for transport under chain of custody to NET Pacific Laboratories, Santa Rosa, California. The four soil samples were then composited by the laboratory for analysis as one sample for TPH as gasoline and diesel, BTEX, soluble threshold limiting concentration (STLC) lead, and for reactivity, corrosivity, and ignitability. A copy of the laboratory analytical report is presented in the Appendix. Based on the analytical results, DEES Excavation (DEES), Dixon, California, removed the stockpiled soil from the site on March 15, 1993, and transported it to Browning Ferris Class III Landfill, Livermore, California, for disposal. Copies of the soil disposal manifests are included in the Appendix. On March 15, 1993, DEES backfilled the UST excavation with Class II aggregate. The aggregate was stockpiled onsite and then unloaded in the excavation using a backhoe bucket. The aggregate was compacted in I8- to 24--inch lifts using a vibraplate attached to the backhoe bucket. CONCLUSION On the basis of analytical results collected from the former UST excavation, soil containing detectable amounts of petroleum hydrocarbons has been removed from the excavation and no significant levels of petroleum hydrocarbons remain onsite. The UST excavation has been backfilled and the impacted soil has been removed from the site and properly disposed. On the basis of the June 1991 work performed and the guidelines for the FRF being completed, it is HLA's opinion that the site has been adequately characterized and that no further work is warranted. HLA therefore requests that the SJCEHD grant case closure for the site.