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1 i ' Investigate the UST release to document vertical and lateral impacts of the fuel release to soil • and groundwater around the former USTs I In addition, it was agreed that The Learner Company would prepare a UST Site Investigation ' Workplan and submit it to the EHD and the UST Cleanup Fund for review and approval before ' commencing with site investigation activities The workplan will be prepared to follow the requirements of the Tri-Regional Board Staff Recommendations for Preliminary Evaluation and ' Investigation of Underground Tank Sites ' 2.0 COMPLETED ACTIVITfES ' Subsequent to the meeting referred to above, the hydrocarbon-impacted soils were recharacterized q g , ' and the UST excavation was backfilled for safety reasons Also, the Learner Company agreed to conduct an additional investigation to document vertical and lateral hydrocarbon impacts I� 2.1 Stockpile Sampling and Evaluation ' On December 19, 1996, The Learner Company, with assistance from Clayton, sampled the impacted sod stockpiled adjacent to the open excavation, under the supervision of Mr Harlin Knoll of EHD ' A total of nine samples was collected from the stockpile, at locations numbered SP-1 through SP-9 Figure 3 shows the nine sample locations The individual samples were combined into three ' composite samples, numbered SP-1 through SP-3, SP-4 through SP-6, and SP-7 through SP-9 ' Each sample was collected in a 2-inch diameter by 6-inch long brass sampling sleeve The ends of the sleeve were covered with a Teflon sheet, capped, and labeled with the appropriate date, time, and sample designation The samples were then placed into a cooler containing reusable ice and delivered ' to Clayton's laboratory in Pleasanton, a California Certified Laboratory Samples were transported . The Learner Company-UST invesuptim Wn&pian IPRE vwpmitimi6cai doeRev 0Oune 1997) 2 I