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AZURE ENVIRONMENTAL • January 29, 1999 AZ 145-001 FOURTH QUARTER 1998 GROUND-WATER MONITORING REPORT October i through December 31, 1998 Manna Pro Facility Stockton, California 1.0 INTRODUCTION This Quarterly Ground-Water Monitoring Report is submitted on behalf of Manna Pro Corporation("Manna Pro") for the facility at 4004 South El Dorado Street in Stockton, California("the Site", Figures 1 and 2) Tins report presents the results of ground-water monitoring performed at the Site for the period of October i through December 31, 1998 This report also contains a technical status summary of the work completed at the Site during the quarterly period and work anticipated to be performed during January through March 1999 2.0 DESCRIPTION OF GROUND-WATER MONITORING PROGRAM The ground-water monitoring program at the Site consists 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, in accordance with the monitoring schedule in Table 1 I • Quarterly submittal of ground-water monitoring reports 3.0 GROUND-WATER MONITORING RESULTS 1 3.1 Ground-Water Elevations and Flow Direction ' Water-level measurements and calculated ground-water elevations were collected from monitoring wells at the Site on November 23, 1998 and are summarized in Table 2 Ground- water elevations from Site monitoring wells were used to construct potentiometric contours for Ishallow-zone sediments A water table elevation map for the shallow ground-water zone is illustrated in Figure 3 ' Ground-water level data indicate the depth to ground water measured in on-site wells on November 23, 1998 varied between 26 10- and 28 31-feet below grade Dunng the period ' between October 1992 and November 1998, the depth to ground water vaned between 43 12 feet and 26 70 feet, respectively, at well MW-2 Based upon these data, it appears that water levels at the Site have risen approximately 16 4 feet during the period between October 1992 and 1 ' 1