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March 28, 2003 <br />San Joaquin County Environmental Health <br />304 E Weber Ave <br />3r4 Floor, Stockton CA 95202 <br />ATT: Ray von Flue <br />Gentlemen, <br />MECHANICAL CONTRACTORS <br />1717 Doolittle Dow <br />P.O. BOX $569 <br />San Leandro, Caftoma 84577-0855 <br />(610) 895-2933 <br />Contractors [.kens® No. 184480 <br />On March 18, 2003, Scott Co. of California started SB -989 repairs for Bank of Stock -ton. <br />We performed helium testing on annular space and found helium traces near turbine area. <br />Concrete was removed and area was excavated. Upon exposing tank top, we located al <br />crack in secondary tank. Damaged area was approximately 1.5 feet below tank top. <br />Containment solutions repaired tank on 3-21-03. Repair passed testing but system would <br />not hold vacuum. Additional helium testing was performed and leak was found in <br />annular riser. PVC annular riser had not been glued properly. We repaired annular riser <br />and performed vacuum test. Tank annular passed vacuum testing, <br />Helium testing was performed on product and return lines. We found all secondary 3" <br />Ameron fittings leaking. Five Ameron fittings were removed and replaced. Testing was <br />performed on secondary product and return and all lines held pressure. Testing was <br />performed at 5 P.S.I. for two hours. <br />N March 27, 2003, Scott Co. of California fiberglassed containment sump and <br />performed hydrostatic testing using Incon sump test system. Hydrostatic testing of <br />containment sump passed and repairs were complete, All repairs were left uncovered and <br />visible for inspection. If you should have any addition questions or concerns, please do <br />not hesitate to call me at 510-895-2333 EXT. 395. <br />Very Truly Yours, <br />Scott Co. of California <br />Bill McCarthy <br />Ptoi ect Manager <br />... 2/2*� .-8TS'ON-..- 00 iiODS WU8V:OT E002*82*dUW <br />