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May 23 , 1988 <br /> Page 6 <br /> • Other samples are held for 30 to 60 days from <br /> Y the sample date, at <br /> which time they are discarded and the sample tubes are cleaned <br /> for the next project. <br /> All samples are delivered to analytical laboratories with a <br /> Chain-of-Custody record. Plate 3 , is a copy of our Chain-of- <br /> custody record. This record is included in all evaluation <br /> studies requiring laboratory testing. <br /> We trust the information contained herein meets your needs at <br /> this time. If you feel you have any questions or need additional <br /> information, please call, us at your convenience. <br /> Respectfully submitted, <br /> BALBI & CHANG ASSOCIATES <br /> Bruno Korbmacher <br /> Staff Engineer <br /> BK/ws <br /> cc: Mr. Chris Winsor, ARCO <br /> Mr. Thomas A. Barghausen, Barghausen Consulting Engineers <br />