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O5/25/2001 14 24 2094671 AGE STOCKTON PAGE 04 • 22 June 2001 AGE-NC Project No 97-0333 Page 2 of 10 Volatile aromatics compounds(benzene, toluene, ethylbenzene and xylenes BTEX)were detected in soil samples collected beneath the east ends of three USTs at concentrations ranguxg up to 340 mg/kg,beneath the west ends of the USTs at concentrations ganging up to 2 7 mg/kg, and beneath product piping at concentrations ranging up to 880 mg/kg Fuel oxygenated compounds (methyl tertiary butyl ether MTBE, text-amyl methyl ether TNM and tert-butanol TRA)were detected in soil samples collected beneath the east ends of the three USTs at concentrations ranging up to 16 mg/kg, beneath the west ends of the USTs at concentrations ranging up to 3 1 mg/kg, and beneath product piping at concentrations ranging up to 690 mg/kg Analytical results are summarized in Table l 2 3 PREVIOUS SUBSURFACE INVESTIGATION The following is a summary of previous investigations at the site of the unauthorized release of fuel products to the subsurface • 15 April 1999 - Six soil borings (J'-I through P-6) were advanced at the site to assess the lateral and vertical extent of petroleum-impacted soil and ground water(Figure 2) A total of I / soil samples and fi)c ground water samples were collected during the investigation and were submitted for laboratory analysis TPH-g and total petroleum hydrocarbons quantified _ as diesel (TPH-d) were detected to analyzed soil samples at concentrations as high as 390 mg/kg, dissolved TPH-g and TPH-d were detected in grab ground water samples at concentrations ranging as high as 310,000 micrograms per liter (,ug/l) BTEX compounds were detected to selected soil samples and grab ground water samples at concentrations as laugh as 51 mg/kg and 48,000 Mcg/1 respectively MTBE, TAME and TBA were detected in selected soil samples and grab ground xi ater samples at concentrations as lugh as 0 36 mg/kg and 310,000 j.Lg/l Results of the April 1999 investigation were reported to Preliminary Investigation and Evaluation Report (PIER) dated 11 June 1999 prepared by AGE 29 June 2000 - Ground water monztonng wells MW_1, MW-2, MW-3, MW-4 at-id MW-5 N-,,ere utstalled on- and off-site to assess the lateral and vertical extent of petroleum--Impacted soil and ground water A total of seventeen 5011 samples ,vete collected during drilling activities and submitted to a DHS-certified laboratory for analysis for TPH-g, BTEX,MT$E, ETBE, FA.,-vM, D1PE, TBA, I,2-DCA, EDB,methanol and ethanol TPH-g was detected xn soil samples collected from borings MW-1, MW-2 and MW-4 at concentrations as high as 85 mg/kg, BTEX compounds «ere detected to soil samples collected from MW-1, MW-2 and MM'-4 at core entrattons as high as 6 7 mg/kg, MTBE and TAME were detected m soil samples collectcd from MW-1, NTW-2 and BIW-3 at concentrations ranging as lugh as I I 0 mg/kg No other fuel components vete detected by laboratory analysis Results of the T„uc �OOU tmestlgation A,%ete reported in Quarterly Report Third Quarter )000 dated ')G 1dUaxLeJC=e0�nironman�nl �