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IV February 24, 1999 San Joaquin County Environmental Health 304 East Weber Avenue, 3rd Floor Stockton, California 95202 Attention: Doug Wilson Regarding: ARCO #4932 — 16 East Harding, Stockton Tank Entry Permit Application Supplemental Information Gentlemen: MECHANICAL CONTRACTORS 1717 Doolittle Drive P.O. Box 5555 San Leandro, California 94577-0655 (510) 895-2333 Contractors License No. 184480 As per our telephone conversation on Wednesday, February 24, 1999, please find the supplemental information I promised you to complete the original permit submittal package Federal Expressed to you on Thursday, February 18, 1999 for this site and 16 E. Harding in Stockton. The submittal for this information is attached. In addition to this information I omitted the discussion and procedures for exposing and inspecting the product lines at this site. The scope and procedures are as follows: Perform precision product line test on all lines prior to exposure. 2. Sawcut, break and remove all concrete/asphalt over the top of product lines. 3. Pull turbine check valves for all three (3) products and drain. Blow lines clear with nitrogen. 4. Hand excavate all lines from dispensers to tank field. 5. Notify agency to inspect pipe per the following: "Perform nitrogen pressure test on all product piping from dispenser point to termination at pump. Test will be done with nitrogen at 1.5 times operating pressure, approximately 45 psi. Pressure can be increased at agency request up to 75 psi. Test pressures to remain on all piping for a minimum of 1 hour. 6. Soap -test all joints under agency supervision. 7. Provide a third party Engineer to inspect pipe and report on product piping conditions. Submit third party report to San Joaquin County Environmental Health. Third party Engineer will be Kerri M. Howell of M.J. Schiff & Associates. Credentials are attached.