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7 <br /> June 12, 1987 <br /> 87-4694.03 Harding layman An"clates <br /> Mr. Walt Lubcke <br /> 7-Eleven Stores <br /> Page 2 <br /> 2. Trace the distribution and extent of BTX, thereby evaluating <br /> whether chemicals found earlier near the dry well are from the <br /> dry well or from the leaking tank. <br /> 3• Provide information on design of interim remedial measures <br /> (IRMs) that may be required for ground-water cleanup. <br /> F: <br /> 4. . Monitor the free-product plume and future remediation measures. <br /> a <br /> 5• Consult with local regulatory agencies to evaluate the feasibility <br /> of various schemes for ground-water remediation. <br /> No off-site wells are proposed in this phase, however, off-site wells may be <br /> required later after on-site subsurface conditions have been more thoroughly. <br /> characterized: Subsequent phases of this project will be to install <br /> well and design and implement a ground-watean extraction <br /> r remediation program. y <br /> SCOPE OF'SERVICES <br /> I <br /> 7 <br /> We propose to provide the following scope of services during this phase: <br /> i; <br /> ` !• Obtain well permits from the San Joaquin Local Health District. € <br /> f <br /> 2. Take water-level measurements of all existing wcIls onsite. <br /> 3. Purge and resample existing wells on r site, including Monitoring r <br /> J i Wells A and B. Check each well for presence and thickness of i <br /> free product. All water samples will be tested for BTX and <br /> ethylene dibromide (EDB). <br /> 4. Drill and sample a series of shallow borings (to 1.-2 feet__below-- <br /> b <br /> _ <br /> water-table) eginnin im <br /> i <br /> based The number <br /> of boringsdrille should be aiately tf f the Leaky <br /> Rtankfield decision - <br /> K occurrence of free product, odor, etc. Borings.will <br /> i. <br /> extend in the.direction of the dry well (i.e., approximately <br /> downgrade), and at to one boring will be drilled near or <br /> downgradient of the dry well.. One. boring will also be drilled <br /> l adjacent to the product line between the tasks and pumps to <br /> evaluate whether;leakage may have travelled through the trench <br /> backfill. Selected soil samples will b <br /> hydrocarbons (TPH). a tested for total petroleum <br /> r: <br /> 1-1111 ills <br /> .may <br /> t <br />