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1 ' <br /> June 12, 1987 - <br /> 87-4694.03 Harding t a; san ks:eclat®s <br /> Mr. Walt Lubcke <br /> 7-Eleven Stores <br /> Page 3 <br /> 5. Purge and sample each boring and check for free product after <br /> the boring has recovered for several hours. Each boring will then <br /> be seated with a cement bentonite grout. <br /> 6. Site and construct two shallow wells downgradient of the tanks if <br /> F free product is found. The wells may only extend to a depth of <br /> 10 to 15 feet and will have 4-inch diameters so that they can be <br /> used in later phaees for extraction. <br /> 7. Drill and sample one boring upgradient of the tanks and then <br /> construct a 2-inch monitoring well in the borehole. <br /> 8. Evaluate distribution of BTX and EDB in the ground water to <br /> differentiate the gasoline source. <br /> 9. Summarize our findings in a report and provide recommendations <br /> for the location of an extraction well and for subsequent field <br /> testing. <br /> r 10. Consult with local regulatory agencies to evaluate various options E <br /> for ground-water remediation. <br /> 1� 3 <br /> All wells in the pavement area will be completed below grade with a:lockable, <br /> watertight cap and encased in a Cristy box. Flush-threaded Schedule 40 PVC <br /> Pipe will be used for all wells. Borings will be backfiiled with a cement- <br /> bentonite slurry. All water and soil will be stored in drums on site. <br /> We understand that The Southland Corporation intends to relocate the underground tanks southeast of their present location in September 1987. A <br /> future phase of our investigation should be to provide observations during the <br /> 1 removal of the tanks and gasoline-laden soils and ground water from the tank <br /> excavat:rn. After the excavation is complete, we would also propose to install <br /> an extraction well in the excavation, perform a pump test, and design and <br /> r implement a plan to remediate BTX in the ground water. <br /> SCHEDULE-AND FFF ' <br /> --We propose to perform the services described above on a time-and expense basis <br /> for an estimated fee of $18,075 as detailed below. The fee estimate µ,ill not be <br /> y exceeded wiYhout.your authorization. We request that the terms and fee <br /> schedule of our national contract with The Southland Corporation apply to this . <br /> phase of the project. <br />