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GROUNDWATER ASSESSMEN r REPORT T ABLE 3 SOIL AND GROUNDWATER LABORA'T'ORY ANALYTICAL RESULTS COLLECTED JANUARY 10 AND 11, 2001 Sample__ —Fuel Oxygenates and _ TBA/Ethanol/- Identification Total Lead TPHgI BTEX DCA Methanol _ Soil Results(in milligrams per kilogram) t1 S-14-TPlA 77 -- -- -- - S-14-TP4A 88 -- -- -- S-14-TP5 A 59 S-14-TP10 6 7 -- -- S-14-TP 14 60 -- -- S-14-TP15 78 -- -- Groundwater Results (in micrograms per liter) W-30-TP9 -- -- <10 <5 0/<50 I<200 W-25-TP10 -- <10 <5 0/<50/<200 W-35-TP10 <50/<0 5 <10 <5 01<501<200 W-25-TP12 -- -- <10 <5 0/<50/<200 W-30-TP13 -- -- <10 <5 0/<50/<200 W-25-TP14 -- -- <10 <5 0/<501<200 W-25-TP15 -- <50/<05 <10 <5 0/<50/<200 W-25-TP16 -- -- <1 0 <5 0/<50/<200 W-35-TP16 -- -- <10 <5 0/<50/<200 W-25-TP17 -- <501<0 5 <10 <5 0/<50/<200 W-25-TP 18 -- -- <10 <5 01<50/<200 W-25-TP19 -- <10 <5 0/<50/<200 Fuel Oxygenates include MTBE,DIPS,TAME,ETBE,EDB,TBA ethanol and methanol by EPA Method 8260 ---=Not analyzed _ <0 5=Concentration less than reported laboratory detection hunt ` impact to the soil ESA obtained a well pernut from SSCEHD on October 23, 2001 In addition r -- - -to-the monitoring wells,-Ms-Lofstrom requested eine a sotl-boiing (TP-20)be placed north of the — -- former tank pit to assess the areas that were inaccessible due to saturated soil conditions during the previous assessment-and-to observe soil-conditions-below 30-feet-bgs The need foi soil-boring -- - -- - _ TP-20 was determined in a discussion between Ms Lofstrom, the Central Valley Regional Water Quality Control Board, and ESA The four groundwater monitoring wells (MW-1 through MW-4) and one soil boring(TP-20) were installed on October 25, 2001 and November 16, 2001 Locations of monitoring wells MW-1 through MW-4 and sod boring TP-20 are shown on Figure 6 Groundwater Assessment Report 11 ESA/200252 � September 2003