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' QUARTERLY GROUNDWATER MONITORING REPORT THIRD QUARTER 1997 QUIK STOP MARKET NO. 132 355 WEST HAMMER LANE STOCKTON, CALIFORNIA i 1. INTRODUCTION 1 1 ATC Associates Inc , formerly Smith Technology Corporation, is pleased to present this report of the results of the third quarter 1997 groundwater monitoring conducted at the subject site in Stockton San Joaquin County, California (Figure 1) The site plan (Figure 2) shows the location of the station building adjacent streets, monitoring wells, and other site-specific features The monitoring wells ha,a been sampled quarterly to monitor two shalloNN groundwater aquifers i ' underlying the site The program objectives are listed below • Measure depth of groundwater • Sample and analyze groundwater samples for selectedpetroleum hydrocarbon constituents • Construct a groundwater elevation contour map within the study area boundaries ' • Compare current and past data ' The existence and degree of petroleum hydrocarbons in the groundwater underlying a site is evaluated by (1) the presence of the free-floating product, and (2) laboratory analyses of groundwater samples to ' evaluate concentrations of total petroleum hydrocarbons as gasoline (TPH-G), and for benzene toluene ethylbenzene, and total xylenes (BTEX) Also in compliance with the request of the California Regional Water Quality Control Board (State of California, May 2, 1995) we are including reporting of methyl-tert- butyl ether (MTBE) (a non metallic antiknock and oxygenating compound used in gasoline) In a letter to Quik Stop Markets Inc , dated April 1 1997 the San Joaquin Count-, Public Health Services Environmental Health Division (PHS-EHD) stated the that "the only remaining issue at the site is the 1)97 31d()oartcr OrOund-1-67o-wrin6 Report 1 rCV535.1\0001194 2731REPORTS%3 RD!)rR197 RP r DOC IOLICIM 29 1997