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Ms. Wendy Wyels <br /> Page Three <br /> September 15, 1993 <br /> removal will increase if new zones of contamination are identified in the driveway <br /> and west tank farm areas. <br /> Unocal Corporate Environmental Remediation & Technology (Brea Office) is <br /> currently investigating bio-chemical processes that convert organic compounds <br /> (molasses, whey, lignin, urea, and other agricultural feed products) to nitrites in the <br /> soil. Unocal chemists may answer some difficult questions concerning chemical <br /> conversion of complex organic compounds and the effect that these compounds may <br /> have on ground water. "Unocal is also investigating surrounding properties to <br /> determine the environmental climate of lthe ge eraPdrea. <br /> Unocal feels it would not be prudent to begin remediation until the horizontal and <br /> lateral extent of the elevated TKN soils are known, therefore we propose to postpone <br /> this portion of the project until the first"four tasks are completed. <br /> SUMMARY: Stand-alone workplans will be,presented to RWQCB prior to initiation of <br /> project phases. Unocal is prepared to start this phase of work within 30 days after <br /> approval of all involved parties. After completion of the above tasks and studies we will <br /> respond to the RWQCB on the proposed cleanup levels. Unocal anticipates a thoughtful <br /> and timely regulatory closure of the site. 'Please call if you have questions or need <br /> additional information. <br /> I <br /> Sincerely, <br /> z <br /> W.T. Nicke_ n-. <br /> Senior Environmental Engineer <br /> WW/bsb <br /> Enclosure <br /> cc. Michael Infurna, San Joaquin County <br /> Charlene Wall, Port of Stockton <br /> Gary Rimmey, Cargill Molasses <br /> April Pearson, Unocal <br /> Jan Wagoner, PureGro Company <br /> Bill Withrow, PM AG Products <br /> John Rapp, Sierra-Pacific <br /> Ron Bock, Unocal <br /> I <br /> � I <br />