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Mr.Leon Brasowski,Ogden -3- 25 February 1993 <br /> quantitation limit) must be reported along with the detection and quantitation limits for <br /> the analyses performed, The use of laboratory "reporting limits" is unacceptable. <br /> Analytical results contained in your 18 February 1992 report fail to discriminate between <br /> detection and quantitation limits. To prevent the analysis of constituents associated with <br /> sediment, samples for constituents other than BTEX and TPH(gasoline)should be field <br /> .filtered prior to analysis,using an in-line filtration device which prevents the entrainment <br /> of air into the sample. Total lead analyses should utilize EPA Method 7421 (or Method <br /> 239.2),with detection limits of 1 gg/l or less and quantitation limits of 5 gg/l or less, as <br /> practicable. Appropriate quality assurance/quality control procedures should be <br /> included in all sampling and analytical work to assure the accuracy of the resulting data. <br /> Your 18 February 1992 monitoring report notes problems with water level measurements <br /> in monitoring wells for the fourth quarter of 1991. Water level data are critical to the <br /> understanding of ground water movement beneath the site. As such,great care must be <br /> taken to assure the accuracy of all subsequent monitoring well water level measurements. <br /> If you have any questions,please call me at (916) 255-3123. <br /> Jon B. Marshack, D. Env. <br /> Senior Environmental Specialist <br /> Environmental/Technical Support Unit <br /> Land Discharge Section <br /> X <br /> Attachment <br /> cc: Gordon Lee Boggs,Underground Tank Program Coordinator,RWQCB,Sacramento <br /> Martha Vazquez, California Integrated Waste Management Board, Sacramento <br /> Padilla, San Joaquin County Environmental Health Services,Stockton <br /> Hazel Wheeler, SCATI, Stockton <br /> Robert E. Lauchland, Kaufman & Broad Central Valley, Inc.,Modesto <br />