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' QUARTERLY GROUND WATER MONITORINO REPORT _ 6131 Paciflc Avenue Stockton Callfornla Page 1 r 1. 0 INTRODUCTION ' This report presents the results of the quarterly ground water monitoring completed by Aegis Environmental, Inc. (Aegis) , during the fourth quarter of the calendar year 1990, at an operating fuel station located at 6131 Pacific Avenue, Stockton, California (Figure 1) . ' The scope of this phase of ground water monitoring is to: o Sample ground water from each monitoring well on site on ta quarterly basis; o Submit water samples to a California-certified laboratory for analytical testing; ' o Collect ground water level data on a monthly basis; and ' o Evaluate chemical and physical data for report preparation and project management. 1.1 Background Three ground water monitoring wells were installed at the subject site in July of 1990. A review of the site activities and conditions are discussed in Aegis' Site Assessment Report, dated 4 January 1991. 1 2.0 QUARTERLY MONITORING DATA This section of the report presents the results of the ongoing ' monitoring of ground water elevations and ground water analytical laboratory data collected since July 1990. Aegis ' Standard Operating Procedures for sample collection, sample handling and ' sample analysis are presented in Appendix A. 2 .1 Ground Water Level Measurements Water levels have been measured monthly since the installation of the monitoring wells an July of 1990. All water level measurements were made from the referenced well head elevations (top of casing) , ' measured to the nearest 0. 01 foot and are summarized in Table 1. Well head elevations were surveyed and referenced to a temporary benchmark with an assumed elevation of 100 feet above mean sea 1 level by a Licensed California Land Surveyor. Ground water elevation contour maps have been drafted based upon quarterly 90-020A RPT ' 90-020 OM R