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.11 September 1,996 AGE Project No. 95-0108 ' Page 3 of 10 ' further,indicted that the unauthorized corrective action could cause the vertical movement of existing ' hydrocarbons towards ground water at the site: In response, the bacteria'supplemented water was drained from the former UST excavation. A copy of the Notice included in Appendix B. 3.0. SITE ASSESSMENT AND REMEDIATION 3.1. SOIL BORING DRILLING, JULY AND SEPTEMBER 1992 On 06 July 1992, four soil borings were advanced.at the site under the direction of T & T Earth Services of Jackson, Californi a. Each boring was advanced to a depth of 35 feef below surface grade (bsg)'by Hunt Drilling of Jackson. Petroleum hydrocarbon odors were noted.in samplesTrom each , soil boring: A total-of twelve soil.samples were submitted to state-certified'laboratory for analysis. TPH-g and TPH-d were detected in soil samples from each boring at concentrations up to 2,600-ppm (B l-37- 55"). BTE&X was not detected in any of the soil samples; ho«ever, method detection/reporting limits for BTE&X were above PHS-EI-11) acceptable concentrations. Analytical results of boring soil samples are included in Table 2. A.copy of the laboratory report is included in Appendix C. ' At the request of the PHS-EHD;two additional soil borings were advanced at the site by T&T on 08 September 1992. Borings LCSB-1D and LCSB4--1D were placed immediately adjacent,to borings S81 and. SB4 to obtain duplicate samples'for analysis using acceptable method detection/reporting ' limits for BTE&X. A PHS-EHD inspection report indicates that hydrocarbon odors were not noted in samples-collected from the duplicate borings. Analytical results of TPH-d for soil samples were not located in'PHS-EHD files. A copy of the PHS-EHD Field Inspection Report is included.in ' Appendix D. ' 3.2. HYDROCARBON-IMPACTED STOCKPILE SOIL SAMPLING, FEBRUARY 1993 ' On 04 February 1993,Park Environmental(Park)of Roseville,California collected nine soil samples from the 350 cubic yards of stockpiled hydrocarbon impacted-soil and one composite water sample, from run-off water that accumulated in the former UST excavation. All samples were.transported to Sierra Laboratories in Anaheim, California for analysis of TPH-d. TPH-d was not detected in the soil or grab water samples collected'from the site. Analytical results of the soil samples are summarized on Table 3. A copy of the Park stockpile soil-sampling location diagram and laboratory. ' -report is included in Appendix E.. • In a,letterdated 23 March 1993,the PHS-EHD'stated that soil sampling performed on 04 February