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• April 28, 2006 FIRST QUARTER 2006 GROUND -WATER MONITORING REPORT Tesoro Site #67080; SJCEHD Case No. 1948 2448 West Kettleman Lane ,AZURE ENVIRONMENTAL AZ142-024 Lodi, California 1.0 INTRODUCTION ' This First Quarter 2006 Ground -Water Monitoring Report was prepared on behalf of Tesoro Environmental Resources Company (Tesoro) for the Tesoro Site #67080 (former Beacon Station ' #3696) at 2448 Kettleman Road in Lodi, California ("the Site"; Figure 1). This report presents the results of ground -water monitoring performed at the Site for the period of January l through March 31, 2006. This report also contains a technical status summary of the work completed at the Site during the reporting period and work anticipated to be performed during April through June, 2006. ' 2.0 GROUND -WATER MONITORING RESULTS Ground -water monitoring performed at the Site consisted of the following activities: ' . Quarterly collection of ground -water level measurements from monitoring wells. • Quarterly collection and laboratory analysis of ground -water samples from monitoring wells. • Preparation and submittal of ground -water monitoring reports. 2.1 Ground -Water Elevations and Flow Direction Water -level measurements and calculated ground -water elevations were collected from monitoring wells MW -1 through MW -3 on February 15, 2006. Water -level measurement and calculated ground -water elevation data are summarized in Table 1. Ground -water elevations from Site monitoring wells were used to construct a water table elevation contour map (Figure 2). Ground -water level data indicate the depth to ground water measured in the monitoring wells on February 15, 2006 varied between 46.45- and 46.95 -feet below grade. These data indicate higher ground -water levels at the Site compared to previous water -level measurements collected in October 2005 (approximately 2.61 -feet higher at well MW -1). Water -table elevation data collected at the Site indicate a general west-northwest direction of ground -water flow, with a v - calculated horizontal hydraulic gradient of approximately 0.044 ft/ft (Figure 2).. Previous reports of potentiometric data and interpretations of ground -water flow at the Site indicate ground -water flow direction varies between northwest and southwest.