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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. R5-2006-0078-B FOR PORT OF STOCKTON WEST COMPLEX DOCKS 14 AND 15 DREDGING PROJECT ROBERTS ISLAND NO. 1 DREDGED MATERIAL DISPOSAL SITE SAN JOAQUIN COUNTY This Monitoring and Reporting Program (MRP) amends MRP No. R5-2006-0078-A and provides requirements for monitoring groundwater at the Robert Island No. 1 (RN1) facility. This MRP is issued pursuant to Water Code Section 13267. The cost and expense of the technical reports required by this MRP are necessary to monitor water quality changes before and after discharges to dredge material placement sites. The Discharger shall not implement any changes to this MRP unless, and until, a revised MRP is issued by the Executive Officer. All samples should be representative of the volume and nature of the discharge or matrix of material sampled. The time, date, and location of each grab sample shall be recorded on the sample chain of custody form. Field test instruments (such as those used to test pH, turbidity and dissolved oxygen) may be used provided that: 1. The operator is trained in proper use and maintenance of the instruments: 2. The instruments are calibrated prior to each monitoring event; 3. Instruments are serviced and/or calibrated by the manufacturer at the recommended frequency; and 4. Field calibration reports are submitted as described in the "Reporting" section of this MRP. GROUNDWATER MONITORING Groundwater at RN1 shall be monitored on an annual basis during the second quarter of each year at three clusters of wells at the following locations: 1) Wells in the dredged sediment area: MW-5d,p,s, MW-12d,r,s, MW-19d,p,s 2) Wells down gradient from the dredged sediment area: MW-7p,s, MW-8p,s 3) Background wells: MW-9p,s, MW-10p,s, MW-11 p,s Other wells previously used for groundwater monitoring under the previous MRP should be properly abandoned and sealed, under permit and in accordance with San Joaquin County Environmental Health Department requirements.