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ANATEC er^ACQ LABORATORIES \ INC. 435 Tesconi Circle Santa Rosa, California 95401 ;07-32b-71 -100 Annelise Jade Bazar May 26 , 1987 EMCON ANATEC Log No. 9308 (1-9) 1921 Ringwood Avenue Series No: 394/003 San Jose, CA 95131 Client Ref: PO 14275 Subject: Analysis of .Nine Water Samples Received on : May 15, 1987 to Measure Mercury Content. Dear Ms. Bazar: Analysis of the above referenced samples has been completed. Results of analysis are presented in Table 1. Other samples R received in the same shipment were assigned separate log numbers; results of analysis of those samples will be reported under sep- arate cover. Brief descriptions of sample handling, preparation and mercury analysis procedures follow. Samples were delivered by a commercial courier (National Courier Service) on May 15, 1987 at 11:11 am. Upon receipt, the samples were found to be intact, legibly labeled, cold by virtue of refrigerated shipment and in otherwise good condition® Samples were accompanied by chain-of-custody documentation which was com- pleted during the log-in process. Subsequent to log-in, the pH of each sample was verified to be less than two, and the samples were placed in secure storage where they were maintained at four degrees centigrade until analysis commenced. The procedure for mercury measurement is based on Method 245.1 found in U.S. EPA Publication No. 600/4-79-020, "Methods for Chemical Analysis of Water and Wastes", revised March 1983. 1 Briefly, aliquots of sample were digested with mixed mineral acids and potassium permanganate. Hydroxylamine hydrochloride was added , to the digested samples to remove excess permanganate. Mercury was reduced to the elemental state by the addition of stannous sulfate and aerated from solution in a closed system attached to an atomic absorption spectrophotometer. Absorbance was measured as a function of mercury concentration. Biological Studies Laboratory Analysis Research