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Ir <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> THIRD QUARTER 1998 <br /> QUIK STOP MARKET NO. 132 <br /> r 355 WEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> r <br /> 1. INTRODUCTION <br /> ATC Associates Inc is pleased to present this report of the results of the third quarter 1998 groundwater <br /> monitoring conducted at the subject site in Stockton, San Joaquin County, California (Figure 1) The site <br /> plan (Figure 2) shows the location of the station building, adjacent streets, monitoring wells, and other <br /> site-specific features <br /> The monitoring wells have been sampled quarterly to monitor two shallow groundwater aquifers <br /> underlying the site, The program objectives are listed below <br /> r • Measure depth of groundwater <br /> • Sample and analyze groundwater samples for selected petroleum hydrocarbon constituents <br /> • Construct a groundwater elevation contour map within the study area boundaries <br /> • Compare current and past data <br /> The existence and degree of petroleum hydrocarbons in the groundwater underlying a site is evaluated by <br /> (1) the presence of the free-floating product and (2) laboratory analyses of groundwater samples to <br /> evaluate concentrations of total petroleum hydrocarbons as gasoline (TPH-G), and for benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) Also in compliance with the request of the California Regional <br /> Water Quality Control Board (RWQCB, State of California, May 2, 1995) we are including reporting of <br /> methyl-tert-butyl ether (MTBE) (a non-metallic antiknock and oxygenating compound used in gasoline) <br /> In compliance with the July 18, 1997 request of the RWQCB-Central Valley Region, included with this <br /> report are results of analysis for the fuel oxygenates tert-butanol, MTBE, di-isopropyl ether (DIPE), ethyl- <br /> 1998 3rd Quarter Groandwatcr Monitoring Report <br /> H\Employee Shane AredLEHRMAN\QUIKS70M 132198rpt 3rdd doc[November 23 19981 <br /> it <br />