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s :J Y KLEINFELDER I � June 14, 1990 r File:24-220078-A00 F John*Edmundson Leader's Equityry Cor�orataon 200 Granville St.Suite 22 Vancouver,B,C,Canada VdC IS4 SUBJECT: Soil-Gas and Storage Tank Assessment �- Block Hounded by Weber,El Dorado, Channel and Center Streets Stockton,California Dear Mr.Edmundson: �y Attached is a r port of findings from the soil-gas assessment and the precision waste oil tank: test coadvcs_d at the Weber Block site in Stocktort, California. Fifteen soil-gas samples sere: extracted and anal},zed at the site on May 30, 1990, .The precision tank;test was performed following the standard tank testis instead of the .v=e oil. g procedures and die::el gasoline was used ;E p Asoil-gas survey war conducted to qualitatively asseg the potential prtts =of petroleum hydrocarbons and their constituents on soil in the area of the former fuel storage tanks. Sail-gas seat?Ies were analyzed for purgeabla petroleum hydrocarbons, and benzene, toluene, ethy, benzene and xylene by gas chromatography. Concentra dons up to 25,000 ugg/l of air of petroleum hydrocarbon constituents were detected in soil-gas from the area where the former tanks had been excavated. Levels of petroleurd hydrot:arbons up to 8400 ug/1 of air were detected in soil-gas samples up to 60 feet west and zo tdat southeast of the tank excavation. An elevated concentration of petroleum hydrocarbon constituents of 790 ug/l of air was also detected adjacent to the underground piptno which leads from the tank 'area to the eastern pump island. An addendum containing additional QA/QC information for the soil-;as survey will be following this report. On June 1, 1990 the 500-gallon waste oil tank was precision tested for tank integrity. The tank was found to be Ieaking. It is unknown how long the tank has been,beaking or what volume of waste oil has leaked from the tank to the surrounding soil. Meirfelder feels that t he vertical and lateral extent of the petroleum hydrocarbon impact from the former fuel storage tanks on the soil-gas has been qualitatively assessed, however chemical analysis of soil samples from the site is necessary to assess actual concentrations iof petroleum hydrocarbons and its constituents in.sail. It is probable that San Joaquin County Public Ijealth Service will also request soil samp�ling to provide quantitative concentrations of petroleum hydrocarbons in the soil. I a Regional Water Quality Control Board may request that a ground water assessment be conducted at the site because the ground water is approximately 14 to 16 fact below surface and may be affected by petroleum hydrocarbons,--- ---- -------- -- ---- Kleinfelder rcr-ommai ds O.at petroleum hydrocarbon impact on soil be assessed and that a feasibility study for the re;ued,ation of the soil be conducted for the site, j KLEiNFELDER 9795 Byt Rm Park Dilve, IMMMerurt G 956:7 t91G?3Wi•1�01. *�