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Mr. Jeff Goold • • , <br /> - 2 - <br /> 28 March 2001 <br /> 3. The water quality parameter of turbidity was not recorded during development of monitoring <br /> wells. Turbidity should be recorded until a measurement of 100 NTU or lower is achieved. <br /> 4. The Investigation Report does not discuss the"SP"samples in the text. An explanation must be <br /> Provided for all analytical results provided. <br /> 5. All of the isoconcentration maps submitted did not include a non-detect line or contour to the <br /> lowest order of magnitude. All isoconcentration maps need to show all contour lines. <br /> 6. We concur with the comments on the draft revised MRP. Enclosed is the final MRP No. <br /> 5-01-815, which is now in effect and shall be implemented for the second quarter 2001 <br /> monitoring event. <br /> Please address the above comments in the next quarterly monitoring report, which is due by <br /> 30 April 2001. In addition, by 23 April 2001, please provide a work plan and a schedule to delineate <br /> the lateral extent of contamination. The work plan needs to include the monitoring wells redevelopment <br /> and resurveying to ascertain whether <br /> ion measurements are accurate. If you have <br /> questions, you may contact the project manager,groundwater <br /> Lewis, by telephone at(916) 255-3119 or by any <br /> email at lewisdL@rb5s.swrcbt-ca.gov. <br /> W4'efSi <br /> COHE <br /> CCleanup Unit <br /> Enclosure <br /> cc: Ms. Margaret Lagorio, San Joaquin County public Health Services, Stockton <br /> Mr. Ross Tinline, Toxichem Management Systems, Inc., San Carlos <br />