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KLEINFELDER <br /> File No. 20-3978-01.W23 <br /> February 6, 1997 <br /> Measurement of Water Levels <br /> In order to assess the groundwater gradient at the time of sampling, water level measurements <br /> will be made in the wells at the beginning of each sampling round prior to purging and <br /> sampling the wells. The depth-to-water will be measured in each well according to the <br /> protocol described in Attachment B, Section B-4.1. The depth-to-water measurements will <br /> then be converted to relative groundwater elevations with respect to mean sea level or a local <br /> benchmark by subtracting them from the surveyed casing elevations. <br /> The resulting groundwater elevations will be contoured to assess the direction of the <br /> groundwater gradient at the time of sampling. This information can then be used to assess <br /> which wells represent upgradient and which wells represent downgradient groundwater <br /> conditions. <br /> Collection of Groundwater Samples <br /> Kleinfelder will collect samples from the installed wells. The wells will be purged and <br /> sampled as described in Attachment B, Section B-4.2. Depending on the results of the <br /> groundwater sampling and analysis, quarterly groundwater sampling may be required by the <br /> San Joaquin County PHS/EHD. <br /> Laboratory Analysis <br /> Each of the soil and water samples selected for quantitative analysis will be submitted under <br /> chain-of-custody control to Sequoia Analytical Services (Sequoia) of Sacramento, California. <br /> Sequoia is certified by the California Department of Toxic Substances Control to perform the <br /> requested analysis. <br /> 20-3978-01.W231207PE047 Page 4 of 01997, Kleinfelder, Inc. <br />