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. . 1 <br /> Messrs.Hall and Musco - 4 - ecber 2002 <br /> must be purged after each sampling event as required by the MRP that states, "After collection of <br /> percolate samples, the lysimeters shall be purged dry." <br /> • Section 3.5.3 describes offsite well sampling at 26933 South Hansen Road and states depth to <br /> groundwater measurements will be collected if possible. Collecting depth to groundwater <br /> measurements from this well could contaminate the well with harmful bacteria. Do not collect depth <br /> to groundwater measurements or open the sanitary seal on the well due to the potential for well <br /> contamination. You will note that collection of depth to groundwater measurements is not included <br /> in the Regional Groundwater Monitoring section of the MRP. <br /> • Section 3.6.1 describes laboratory analysis of samples for radioisotope analysis. As previously <br /> described, the basis for selection of the groundwater monitoring wells is inadequately described. <br /> • Section 3.6.3 describes the offsite well analysis. The list of analytes is incomplete, please add the <br /> following analytes that are required by the MRP: chloride, sulfate, boron, and ammonia. <br /> • Section 4 describes the anticipated schedule and lists the pan lysimeter installation as to be <br /> determined. It is noted that the lysimeters shall be installed by 1 May 2003. <br /> • Section 3.6.4 does not contain information on the filter pore size or filter methods. Please provide <br /> information on the filter equipment, filter pore size, and filter procedures for both the field filtering <br /> and the lab filtering. You may elect to run duplicate samples (one filtered, one not filtered)to <br /> determine the effect of filtering samples if you desire. <br /> By 6 January 2003,please submit an addendum that addresses these issues. If you have any questions <br /> regarding this workplan review,please telephone me at(916) 255-3116. <br /> TIMOTHY R. O'BRIEN <br /> Waste Discharge to Land Unit <br /> Lower San Joaquin River Watershed <br /> cc: Dennis DeAnda,Department of Fish and Game, Stockton <br /> Joe Spano,Department of Health Services, Office of Drinking Water, Stockton <br /> Mike Huggins, San Joaquin County Environmental Health Dept., Stockton <br /> David Irey, Esq., San Joaquin County District Attorney, Stockton <br /> Michael Campos, Esq., Stoel Rives LLP, Sacramento <br /> Bill Jennings, DeltaKeeper, Stockton <br /> V:\San Joaquin NonlA taMOb imTkProjcct FileaWww\Ha3E2MO2Aoc <br />