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6eot-lydrologi� Consultants, 1 installed and constructed as Installed to a total depth of 0 feet b diameter monitarin nested vapor extraction gs T$-9TB- g wells Vapor wells TB-3 was shallow Wells With a dee TB-1 1, and TB-12 were ' well screened from P Well screened from completed as damaged duan 5 feet to 30 feet b 3S feet to 60 feet and a g site construction, gs In each Well 114L -3 and MW was abandoned , as re-drilled and re R, which was adjacent to the eastern Additional) placed with a new TPH were detected In excessof Island f Vino �'S ane hand auger boring well casing, So" sample analysis indica d that concentrations drilled areas Including along 00 mg/kg at six weEI locations w western UST g the west side of the Rhin three tions oI (maximum 4 100 PT°petty near the Pump general UST pit(maximum 5,300 Mg/kg TPH), near the center andump Island,he and fanner (maximum Of 5,700 Mg/kg g/kg TPI-J) and an Isolated area surrounds east of the former g g TPH at 30 feet bgs) Results from ng TB-3 TB-8 ground at sampling all contained P g Indicated that w Wells MW_ greater than 10,000 ells MW-4, 3R and T$-1 p contained si pg}L TPH and greater than TB-I, TB-7 dissolved benzene gnlFcantl , and Weil MW_5 contained free y lower Ievels but had 0 pg/L benzene In Se product and therefore W p to 59 Pg/L September 1007, Pacific Environmental as not sampled baselining lnvestrgation In the areas ofthe Group, Inc. (Pacific Included the advancement of fifteen so�1 burin USTs and the dispenser�conducted a site ranging fron, a Islands up to 46,000 pproximately 1 1 to 57 feet b gs (TDD-1 through T , which ' mglkg TPN gs Results of sail sample [5) to depths sample collected from boring 20 mgg benzene, and 71 pie analyses Indicated Method 5020 and was not cofiDD�GS n 15 feet b s mg/kg MTBE, as found In a soil g EPA g MTBE was analyzed by EPA During the I st Method 52b0$ concentrations Of TPHQuarter 2O02, groundwater sam 'nonitorrn as gasoline (TPI I_ piing results Indicated that the Monitoring We11 AW-5 at concentrations� ,lbenzene, and MTBE highest respectively other oxYgenates detected Included were detected in TB-S and tert- 01,0001Ag/L, 7,26Q butyl alcohol T d,-Iso pg/L� and 23,500 pg/L� Alcohol (Methanol (TBA) MW-3R T prOpY1 ether(DIPS) In Tg-1 was also detected In TB-22 $-1, TB-8' TB-10 and 1n November 2003Advanced � and T$-12 Methyl activities that consisted of�drilling three Inc. (CPT) The results afthe {AGE) conducted site assessment aS'ite.�4ssessrnenl Report pre g e locations using CPT testing are re o g a Cotte penetrometer test rig groundwater samples and thired b reported 1n the Cone Penetra and submitted for les and Y AGE the March 31, 2004 meter 7e,Il g/ Y nine sail samples were collected Ototal of eleven grab samples analyzed) Indicated analyses TP samples concentrations (detected in 12 from highest detections In sam soil 9soil borings 408 mg/kg in sample CPT-4_ of 39 sail benzene concentrations were re 40 to 9,l 9,110 Mg/kg samples collected from g g in sample CPT-4-75m C he highest(CPT-4-75) MTBE Parted In sam I The hi CPT-4 was detected P es collected from ghest at concentrations of 0 00I S /k sail sam CPT-4 at 25 3 0068 mg/IC pie from CPT-3 and two mg/kg ' g(CPT-4-90) g g (CPT-3-50), 0 072 '09/kg samples frarn (CPT-4-85), and rflC 171 P2147t Sfudy Page 4