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CLEANUP AND ABATEMENT ORDER NO. 90-XX -3- EXXON COMPANY, U.S.A. SAN JOAQUIN COUNTY Environmental Quality Act (Public Resources Cede, Section 21000 et seq. ) in accordance with Section 15321, (a) (2) , Title 14, California Code of Regulations. 16. Staff of the Regional Boards have developed guidance for cleanup of leaking underground tanks, titled "Tri-Regional Recommendations" and "Appendix A" (copies attached) . This guidance describes the information that should be provided in "Work Plans", "Problem Assessment Reports" , and "Final Remedial Plans" . IT IS HEREBY ORDERED that, pursuant to Sections 13267 and 13304 of the California Water Code, Exxon shall : 1 . By 16 April 1990 submit to the Board a work plan for installing additional ground water monitoring wells to define the full extent of ground water• pollution downgradient from the site. 2. Upon approval of the work plan by the Executive Officer, but no later than 20 May 1990, implement the work plan and submit a Problem Assessment Report (PAR) by 15 July 1990. 3. Upon approval of the PAR by the Executive Officer•, but no later than 15 August 1990 submit a Final Remedial Plan which will , at a minimum, address the mitigation of both soil and ground water pollution. 4. Within 45 days of the Executive Officer's acceptance of the plan, but no later than 30 September 1990, implement the approved Final Remedial Plan. i_ 5. Monitor the depth to ground water and obtain water quality samples from I all existing and future monitoring wells on a quarterly basis, analyze the samples for total petroleum, hydrocarbons, benzene, toluene and xylene, and submit quarterly ground water monitoring reports until such time as the Executive Officer determines that the reports are no longer necessary. 6. Cleanup the waste and abate the effects thereof; and take other necessary remedial action in accordance with the approved remedial action plan. -�lILLIAM-fl.�R00KS";1•kecutive afi'icer -- --- — ------ (Date} --