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Ms Laura Odenthaf <br /> November 11, 1992 <br /> Page 2 <br /> after the removal of fewer than three casing volumes These wells were <br /> allowed to recharge for up to 24 hours Samples were collected as soon as the <br /> well had recharged to a level sufficient for sample collection Petro TrapTM <br /> passive skimmers were installed in wells MW-2, MW- 4, and MW-7 on October <br /> 9, 1992 <br /> Quality Control samples for fourth quarter 1992 monitoring included a trip blank, <br /> field blank and a duplicate well sample The duplicate sample was collected <br /> from monitoring well MW-8 <br /> Samples were cooled with ice packs and delivered, under cha+n-of-custody <br /> control, to Sequoia Analytical laboratory for analysis <br /> ANALYTICAL RESULTS <br /> Samples were analyzed for total purgeable petroleum hydrocarbons, benzene, <br /> toluene, ethylbenzene and total xylenes Analytical results from this quarter's <br /> event and four previous monitoring events are summarized in Table 2 Certified <br /> analytical reports and chain-of-custody records for this quarter's event are <br /> included as attachments to this letter <br /> If you have any questions, please call <br /> Very truly yours, <br /> EMCON Associates <br /> James R Pittilla <br /> Environmental Sampling Coordinator <br /> Phillip R Graham <br /> Environmental Sampling Supervisor <br /> Attachments Table 1 Monitoring Well Field Measurement Data <br /> Table 2 Summary of Analytical Results <br /> Site Map,Certified Analytical Reports and <br /> Chain-of-Custody Records, Water level/ <br /> Floating Product Survey, <br /> Water Sample Field Data Sheets <br /> cc Dan Kirk, Shell Oil Company <br />