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Beacon Station No. 3492• • December 27, 2006 Manteca, California Underground Storage Tanks Closure Report USTs, product and vapor line trenches. Total lead concentrations in these samples ranged from 1.12 to 4.51 ppm. With the exception of a near -reporting -limit concentration of 0.0097 ppm xylenes reported in stockpile soil sample SP4-A,B, no concentrations of TPHg, BTEX, MTBE, DIPE, ETBE, TAME,TBA or methanol were reported in the four stockpile composite soil samples. Ethanol concentrations ranging from 0.026 to 0.19 ppm were reported in the four stockpile composite soil samples. Total lead concentrations in stockpile soil samples ranged from 1.79 to 2.47 ppm. Conclusions Field observations and analytical results indicate site soils have not been impacted with gasoline hydrocarbons. Horizon recommends that the site investigation be considered complete and requires no further work. Limitations The methods and procedures utilized for this work were generally -accepted standards of the practice of geology and environmental science in California at the time of the investigation. This site investigation was conducted solely for the purpose of evaluating shallow soil conditions with respect to the former UST systems. No soil engineering or geotechnical references are implied nor should any such references be inferred. The evaluation of environmental conditions at the site, for purposes of this investigation, was made utilizing a limited number of observation points. Subsurface conditions may vary some distance away from the available observation points. This report is the property of Horizon Environmental Inc. and Ultramar Inc. and is for their sole use and distribution. Please call Horizon at (916) 939-2170 should you have any questions regarding this report. Sincerely, V w RExFORD K SMITH NO. 53 97 Q V.I.0 Rexford Smith, PG No. 530 11f 0} Q� Emil D. Kruck Project Manager F OF CO Assistant Project Geologist Attachments: Figure 1: Site Location Map Figure 2: Site Map Table 1: Analytical Results for Soil Samples Attachment A: Field Methods and Procedures Attachment B: Analytical Reports cc: Mr. Rob Fishburn, Ultramar Inc 492USTrpt Dec06 Project No. 1492.11 3 HORIZON ENVIRONMENTAL INC.