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12th Street <br /> 500 Suite100 Woodwara-Cl de Consultants <br /> Suite 7 <br /> Oakland.CA 94607-4014 <br /> a' (415)893-3600 <br /> September 23, 1988 <br /> 90189K <br /> Anthony J. Landis D Z7 U <br /> Chief Site Mitigation Unit MV <br /> Z7 <br /> of Health Services gEP 291988 <br /> Toxic Substances Control Division <br /> Northern California Section <br /> 4250 Power Inn Road ENVPE MMIgE2VICE lT <br /> Sacramento, CA 95826 <br /> Re: Docket HSA, Past Closure Groundwater Monitoring Program, Dated <br /> 29 April 1988, LIKA Corporation, Former Field Avenue Annex <br /> Dear Mr. Landis: <br /> Pursuant to the referenced agreement, Woodward-Clyde Consultants has <br /> completed groundwater monitoring for the second quarter. As specified <br /> in the agreement, groundwater samples were taken from three monitoring <br /> wells designated as MW-1, MW-3, and MW-4. A travel blank designated <br /> MW-12 and a blind duplicate sample designated MW-13 were also submitted <br /> for analysis. All of the samples were analyzed at a Department of <br /> Health Services-certified laboratory for the following parameters : <br /> Conductivity, pH, Total Dissolved Solids, Total Copper, Total Nickel , <br /> Total Lead and Hexavalent Chromium. The three sampled wells were also <br /> sounded to determine groundwater elevation. <br /> The groundwater samples were collected on August 23, 1988 and taken to <br /> California Analytical Laboratories in West Sacramento. Appropriate <br /> chain of custody was maintained. A summary of the results is presented <br /> in Table 1, and a copy of the laboratory report is attached. <br /> There were a couple of changes made in the second quarterly sampling <br /> from the first quarterly sampling. In the first change, the analytical <br /> method for lead was changed from EPA Method 200.7 to EPA Method 239.2. <br /> The test method was changed to lower the detection limits of the <br /> analysis. In the second change, all of the surveying data for the <br /> monitoring wells were measured from the top of the Christy Boxes <br /> covering the monitoring wells. In the first quarterly sampling the <br /> depth to groundwater was measured from the top of the well casing rather <br /> than from the top of the Christy Box. The difference in the elevation <br /> from the top of the well casing to the top of the Christy Box for each <br /> of the monitoring wells has been adjusted and these changes have been <br /> corrected on the first quarterly table (see attached) <br /> Consulting Engineers.Geologists Q <br /> and Environmental Scientists <br /> Offices in Other Principal Cities _ <br />