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DATE Abril 15, 2003
<br /> QUARTERLY GROUNDWATER MONITORING REPORT-FIRST QUARTER 2003
<br /> Facility Former E-Z Serve No 100878 Site Address 1012 West Yosemite Avenue,Manteca,California
<br /> Responsible P /Contact Person RPMS-CA/Jeff Burke,Project Manager
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<br /> Consulting Co /Contact Person ATC Associates Inc /William G Shipp,Project Mana er 209 579-2221
<br /> ATC Project No 54 25827 2510
<br /> Re ulato Agency/File No I County of San Joaquin,Environmental Health Division/1452
<br /> ' WORK PERFORMED THIS QUARTER [January 1,2003—March 31,20031
<br /> 1 Performed first quarter groundwater monitoring and sampling
<br /> 2 Prepared first quarter groundwater monitoring report
<br /> ' WORK PROPOSED FOR NEXT QUARTER [April 1,2003—June 30,2003]
<br /> 1 Perform second quarter groundwater monitoring and sampling
<br /> 2 Submit second quarter groundwater monitoring report
<br /> ' Current Phase of Project Assessment Assessment,Remediation,etc
<br /> Frequency of Sampling uarterl (Quarterly,etc
<br /> Frequency of Monitoring Quarterl Monthl ,etc
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<br /> Liquid Phase Hydrocarbons Present On Site No Yes/No
<br /> Cumulative PSH Recovered to Date Unknown Gallons
<br /> PSH Recovered This guarter None Gallons
<br /> Pure Water Removed This Quarter 154 Gallons
<br /> ' Permits for Discharge None PES,POTW,etc
<br /> Current Remediation Techniques None SVES,PSH Recovery)
<br /> A22roximate Depth to Groundwater 14 51 to 16 08 Measured Feet
<br /> Groundwater Gradient 0 0013 ft/ft Ma itude
<br /> Groundwater Flow Direction North-Northwest Direction
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<br /> ' Discussion i On February 28, 2003,ATC Associates Inc (ATC)personnel gauged 8 groundwater monitor wells(Figures I and 2) Depth
<br /> to groundwater ranged between 14 51 (MW-7) to 16 08 (MW-3) feet below ground surface (bgs) The calculated hydraulic gradient is
<br /> approximately 0 0013 ft/ft towards the north-northwest (Figure 2) No measurable phase-separated hydrocarbons (PSH) were recorded
<br /> during this monitoring event Groundwater elevations and contours are illustrated on Figure 2 and groundwater monitor data is presented
<br /> in Table 1
<br /> On February 28,2003, ATC collected groundwater samples from monitoring wells MW-1 through MW-8 using the sampling procedures
<br /> described in Appendix A Field logs are also included in Appendix A Groundwater samples collected were analyzed for total petroleum
<br /> ' hydrocarbons characterized as gasoline(TPHg),benzene,toluene,ethylbenzene,and total xylenes(BTEX)by EPA Methods 8015/8020 as
<br /> well as fuel oxygenates and additives methyl tert-butyl ether(MTBE),di-isopropyl ether(DIPE), ethyl tert-butyl ether(ETBE),tert-amyl
<br /> methyl ether (TAME), tert-butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB) by EPA Method 8260B
<br /> TPHg concentrations above the laboratory-reported method detection limit of 50 micrograms per liter(Vg/L )were reported in 3 of the 8
<br /> ' wells sampled this quarter The highest TPHg concentration was detected in sample collected from MW-5 at a concentration of 5,540
<br /> µg/L Benzene concentrations were reported below the laboratory-reported method detection limit of 0 5 µg/L in groundwater samples
<br /> collected from all 8 wells sampled this quarter MTBE, DIPE, ETBE, TAME, TBA, 1,2-DCA,land EDB concentrations were reported
<br /> below their respective laboratory PQL in any of the 8 wells sampled during this monitoring event TPHg, benzene, and MTBE
<br /> ' concentrations are illustrated on Figure 2 and historic groundwater analytical results are presented in Table I Groundwater analytical
<br /> results for fuel'oxygenate and additives are presented in Table 2 Hydrographs of groundwater elevations and analytical data are attached
<br /> in Appendix B and complete laboratory analytical results and chain-of-custody documentation are attached in Appendix C
<br /> 1 Recommendations Continue quarterly groundwater monitoring,sampling,and reporting
<br /> ' ,Summary of Unusual Activity Laboratory analysis of ethanol was inadvertently removed from this quarter's sampling scheme but will
<br /> :be restored in the sampling scheme for the 2°a Quarter 2003 groundwater monitoring and sampling event
<br /> .0 1 Agency Directive Requirements None
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<br /> i I'i Quarter 2003 Groundwater Report EZ SERVE #100878 ATC Associates Inc
<br /> W IWORDPR0125827US MantecalReports1EZ878(2003 Ql GW Rpt)doc ATC Project No 54 25827 2510
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