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Mc Leon IIrasowski,Ogden Projects,0 .2- 22 November 1993 <br /> The 4 November 1993 monitoring submittal also contained a number of errors that should be <br /> corrected in future monitoring reports. Table 2.3 of the May 1993 monitoring data shows "ND" <br /> for petroleum hydrocarbons in the diesel range; this does not match the laboratory data sheet, <br /> which shows a detected concentration of 56 µg/1. Summary tables of monitoring data over time <br /> for each well show data below the laboratory quantitation limit as "ND" with "detection limits" <br /> for each analyte summarized at the bottom of the table. This gives the false impression that <br /> quantitation limits have been constant over time. In addition, the reported "detection limits" do <br /> not match the attached laboratory data sheets. <br /> All data should be reported in one of three ways: <br /> 1) Numerical concentrations for all data above laboratory quantitation limits; <br /> 2) `Trace" for data between detection and quantitation limits, with detection and quantitation <br /> limits reported for all such data); <br /> 3) "< [detection limit]" for all data below laboratory detection limits. <br /> Since many of the detected constituents have been found in concentrations close to laboratory <br /> quantitation limits,it is critical to report all future data in this manner to be able to readily <br /> ascertain compliance with the water quality protection standard(background conditions). <br /> For the above-stated reasons,I am unable to agree with your conclusion that continued post- <br /> closure ground water monitoring at the Stockton Soils Treatment Facility is unnecessary. Ogden <br /> must continue quarterly monitoring of the three ground water monitoring wells until such time as <br /> Chapter 15 standards for cessation of monitoring are met. Due to the erratic nature of monitoring <br /> report submittals under heretofore informal monitoring requirements, I will begin drafting a <br /> formal monitoring and reporting program for your facility for my Executive Officer's signature. <br /> If you have questions regarding this letter,please call me at (916) 255-3123. <br /> i0N B. MARSHACK,D. ENV. <br /> Senior Environmental Specialist <br /> Environmental/Technical Support Unit <br /> Land Discharge Section <br /> J91 <br /> cc: Permitting Section,California Integrated Waste Management Board, Sacramento <br /> Ed,Padilla,San Joaquin County Environmental Health Services, Stockton <br /> s <br />