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16 <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> SECOND QUARTER 1997 <br /> QUIK STOP MARKET NO. 132 <br /> 355 WEST HAMMER LANE <br /> ' STOCKTON, CALIFORNIA <br /> 1 <br /> 1. INTRODUCTION <br /> ' Smith Technology Corporation is pleased to present this report of the results of the second quarter 1997 <br /> groundwater monitoring conducted at the subject site in Stockton, San Joaquin County, California <br /> (Figure 1) The site plan (Figure 2) shows the location of the station building, adjacent streets, monitoring <br /> wells, and other 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 /> • 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 (State of California, May 2, 1995) we are including reporting of methyl-tert- <br /> butyl ether (MTBE) (a non metallic antiknock and oxygenating compound used in gasoline) <br /> In a letter to Quik Stop Markets Inc , dated April 1, 1997, the San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS-EHD) stated the that " the only remaining issue at the site is the <br /> 1997 2nd Quarter Groundwater Manrtanng Report <br /> PLM 594-2771REPORTSgND QTR197 RPT DOC[June 24 19971 <br /> 1 <br /> SMTH <br />