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I: 8-13-1998 10=36AM FROM HORIZON/ELDORADO 916 939 21 /2 r- 4 <br /> i <br /> Farmer Discovery Chevrolet July 21, 1998 <br /> 7kacv California Request for Csrourdwater Disc mj <br /> i <br /> approximately 713 ppb of TPHg and the highest concentration was 2,400 ppb of TPHg. <br /> Groundwater monitoring wells MW-1 and MW-2 are located at the southern and northern <br /> ends of the former UST pit at the site,as shown on the Site Plan(Figure 2). <br /> Horizon is proposing to pump the groundwater into a rented AST for temporary storage at the <br /> site. The groundwater will then be pumped through one 200-pound granular-activated carbon <br /> canister. A 200-pound carbon canister has the potential to adsorb up to 30 pounds of <br /> hydrocarbons before breakthrough. Using the highest concentration of 2,400 ppb of TPHg, <br /> and the anticipated volume of 2,000 gallons of water to be pumped, it is estimated that only <br /> 0.3 pounds of TPHg will need to be removed from the groundwater to produce.treated <br /> groundwater with nondcteetabie hydrocarbons. Therefore, one 200-pound granular-activated <br /> carbon canister should be sufficient to process the pumped groundwater prior to discharge into <br /> the sanitary sewer system. It is anticipated that this work will be performed during August <br /> 1998. <br /> Please call us at(916)939-2170 if you have any questions. <br /> Sincerely, <br /> H�OR_IZO'N ENVIRONMENTAL INC. <br /> --9/ <br /> Ken Mateik <br /> Project Geologist <br /> Attachments- Figure 1,Site Vicinity Map <br /> Figure 2, Site Plan <br /> cc: Ms. Michelle Nokes, Antioch Toyota <br /> I <br /> 3001-21,dsp 2 HORIZON(ENVIROKKENTAL INC. <br />