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24 March 2014 <br /> AGE Project No. 14-3034 <br /> Page 3 of 3 <br /> 2.2. FINDINGS <br /> A total of six soil samples from the UST excavation and eight stockpile samples were <br /> collected during the March 2014 UST removal. The following is a summary of results: <br /> TPH-d were detected in the two western samples from each UST over 10,000 <br /> milligrams per kilogram (mg/kg), from samples collected at the base of the excavation at <br /> 15 feet bsg (Tank #1- West/East) and from the center tank samples at 280 and 410 <br /> mg/kg samples Tank#1-Center and Tank#2-Center, respectively. TPH-d were detected <br /> in the composited soil sample (SP-1,2) at 1,600 mg/kg; and the remaining soil had <br /> detection over 100 mg/kg and one sample had a detection of 6,800 mg/kg. Minor <br /> detection of toluene, ethyl-benzene and total xylene were detected in the UST and <br /> stockpile samples at concentrations of less than 0.1 mg/kg. <br /> No additional constituents of concern were reported above laboratory detection limits in <br /> the soil samples analyzed. Analytical results are summarized in Table 1. The laboratory <br /> reports (CTEL Project No. CT214-1403065 and 1403066), QA/QC reports, and chain of <br /> custody forms are included in Appendix C. <br /> 5.0. SUMMARY/CONCLUSIONS <br /> Based on field evidence of hydrocarbon impact, gray stained soil was observable in the <br /> tank excavation from approximately 15 feet bsg. AGE proposes additional soil to be <br /> excavated from the tank pit after removing the UST. <br /> If you have any questions regarding this matter, please contact our office at (800) 511- <br /> 9300. <br /> Sincerely, <br /> S IWL GEpt� <br /> Advanced GeoEnv' a ,� <br /> * No. 7473 <br /> S �u ' <br /> William R. Little °F^` <br /> Senior Project Geologist <br /> California Professional Geologist No. 7473 <br /> Advanced GmEnviroomental,Inc. <br />