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.RZAMA <br /> t _ f <br /> - Working To Restore Nature <br /> 1710 Main Street 1- 30 <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 <br /> October 13, 1994 <br /> 150047 01 Task 14 <br /> Ms Linda Turkatte <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> RE Quarterly Groundwater Monitoring Report, July through September 1994, Ekholm <br /> Property, 1702 Jackson, Escalon, California <br /> Dear Ms Turkatte. <br /> This correspondence is submitted on behalf of Mrs Margaret Ekholm to present the results of <br /> groundwater monitoring and sampling at the above referenced site (Plate 1) <br /> Groundwater monitoring was conducted on August 31, 1994, by RESNA personnel <br /> Groundwater elevation data are summarized in Table 1 On August 31, 1994 static <br /> groundwater levels measured in the four site wells ranged from 69.41 to 69.89 feet below the <br /> tops of the well casings. A gradient map for the August 31, 1994 monitoring event is shown <br /> on Plate 2 Well MWl was not included in the gradient calculations because the well casing is <br /> bent, therefore the groundwater elevation measurement in MW 1 may not reflect the actual <br /> water table elevation Groundwater flow on August 31, 1994 was to the southwest at a <br /> magnitude of 0.0018 ft/ft or approximately 9.5 feet per mile <br /> Groundwater samples were collected from wells MW 1, MW2, MW3 and MW4 on August 31, <br /> 1994. Prior to sampling, approximately four to five well casing volumes of groundwater were <br /> purged from each well All purged water was contained in labeled DOT approved drums and <br /> stored on site pending laboratory analyses. Groundwater samples were collected after <br /> stabilization of pH, electrical conductivity (EC) and temperature (Attachment 1) The samples <br /> were collected using dedicated, disposable bailers Subsequent to collection, the samples were <br /> placed on ice, secured, and transported under chain-of-custody protocol to State-certified <br /> Sequoia Analytical in Redwood City, California The water samples were analyzed for <br /> benzene, toluene, ethylbenzene and xylenes (BTEX) utilizing EPA method 8020, total <br /> 1500471QUART.YI3Q&1994 aoc 1 <br />