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8-27-1998 9:59AM FROM <br /> H�ORIZON/ELDORADO 916 939 2172 <br /> i <br /> Former Discovery Chevrolet August 25, 1998 <br /> Tracy,Calit'omia Rtsults of Field Test on Extracted Water Treatment <br /> On August 25, Kiff reported the analytical results for the two groundwater samples. The <br /> groundwater sample collected prior to treatment indicated detectable concentrations of TPHg <br /> (of 530 parts per billion [ppb]) and BTEX (between 0.83 ppb and 64 ppb). The groundwater <br /> sample collected after treatment through the gtanular-activated carbon canister indicated <br /> nondetectable concentrations of TPHg (less than 50 ppb) and BTEX (less than 0.5 ppb). The <br /> laboratory analytical data sheets and the chain-of-custody reports are included as Attachment A <br /> to this letter. <br /> As discussed in Horizon's August 18 letter, the singe 200-pound granular-activated carbon <br /> canister should be sufficient to process the approximately 6,000 gallons of water prior to <br /> discharge into the sanitary sewer system. Upon receipt of this letter and the attached results, <br /> would you please provide written authorization for discharge of the treated water_ it is <br /> anticipated that the water discharge work will be performed on August 27 and 28, 1998. <br /> Please feel free to visit the site during the discharge process to examine our work. <br /> Please call us at(916)939- 2170 if you have any questions. <br /> Sincerely, <br /> HORIZON ENVIRONMENTAL INC. <br /> Ken Mateik <br /> Registered Geologist <br /> C.E.G. No.1935 <br /> Attachments: Figure 1, Site Vicinity Map <br /> Laboratory Data Sheets and Chair* of Custody Reports <br /> c: Ms, Michelle Nokes, Antioch Toyota <br /> 3001-2Ldsp 2 HORIZON ENVIRONXI&NITALINC. <br />