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SENT BY: BROSAMER & WALL, LLC; 925 820 3184; MAY-16 ^3 1 :16PM; PAGE 14 Analytical results indicate the levels of total petroleum hydrocarbons as motor oil in the soil are considered significant and above regulatory action. The level of this chemical is above the Risk 13ased Screening Level of (1,000 mg/kg TPH as residual fuels) set firth by the Regional Water Quality Control Beard for industrial/commercial sites. Analytical results indicate the level of chromium, lead, nickel and zinc in the soil are not considered significant and below regulatory action. The level of these chemicals are below the Total 'Threshold Limit Concentration (TTLC) set forth by the California Administration Code,Title 22. In addition, the level of these chernicals are below the Soluble Threshold Limit Concentration(STLC). If analysed by STLC procedures the levet of these chemicals are not likely to exceed STL.0 or the Risk Based Screening Levels set forth by the Regional Water Quality Control Burd for industrial/commercial sites. The levels of the metals detected appear to he consistent within background levels for the area. 4.1,2 Ground Water Based on the results of the grah water testing reported herein, detectable amounts of total petroleum hydrocarbons as diesel, kerosene, motor oil, and its constituents were discovered within the grah water sample (CW-4) collected below the west position along the northern portion of the subject site at approximately 45-50 feet bgs. Maximum concentration detected included 2.50 ygll, total petroleum hydrocarbons as diesel; 78 14-IL total petroleum hydrocarbons as kerosene; 590 14-IL total petroleutn hydrocarbons as motor oil; 1.4 pg/1-toluene; mid 0.51 pg/1.total xylenes. No detectable amounts of total petroleum hydrocarbons as gasoline, Stoddard solve.,rut M413h, halogenated volatile organic compounds or heavy metal were discovered within the grab - water sample (GW-4) collected below the west position along the northern portion of the subject site at approximately 45-50 feet bgs. Analytical results indicate the levels of total pelroleum hydrocarbons as diesel, kerosene, motor oil and its constituents in the ground water are not considered significant and below regulatory action. The level of this chemical is below the Risk Based Screening Level of(500 yg/L TPH as gasoline, 640 /.,g/L'TPH as middle distillates, 640 yg/L TPH as residual fuels, 130 yg/L toluene, and 13 lig/L total xylenes) set forth by the Regional Water Quality Control Board for drinking water resource not threatened.. PHASE 11-04 4-2 02-ENV002S