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DATE November 19 2003
<br /> • QUARTERLY GROUNDWATER MONITORING REPORT—FOURTH QUARTER 2003
<br /> ' Facility Former E-Z Serve No 100966 Site Address 2537 Waterloo Road,Stockton,California
<br /> -Responsible P /Contact Person RPMS-CA/Jeff Burke
<br /> '
<br /> Consulting Co /Contact Person ATC Associates Inc /Jeanne Homse ,Senior Project Manager 209 579-2221
<br /> ATC Project No 54 25827 2612
<br /> Regulatory A enc /CRWQCB Case No I County of San Joaquin Department of Environmental Health/390499
<br /> WORK PERFORMED THIS QUARTER [October 1,2003—December 31,2003]
<br /> 1 Performed fourth quarter groundwater monitoring and sampling
<br /> 2 Prepared fourth quarter groundwater monitoring report
<br /> ' WORK PROPOSED FOR NEXT QUARTER fJanuary 1,2004— March 31,2004]
<br /> 1 Perform first quarter groundwater monitoring and sampling
<br />' 2 Submit first quarter groundwater monitoring report
<br /> 3 Evaluate the need for additional assessment
<br /> 4 Obtain CAP approval from SJCEHD
<br /> 5 Evaluate extended soil vapor extraction pilot testing
<br />�f Current Phase of Pro ect Assessment Assessment,Remediation, etc
<br /> Frequency of Sampling Quarterly (Quarterly,etc
<br /> Frequency of Monitoring Quarterly Monthl ,etc
<br />'
<br /> Liquid Phase Hydrocarbons Present On Site No Yes/No
<br /> Cumulative PSH Recovered to Date Unknown Gallons
<br /> PSH Recovered This Quarter None Gallons
<br /> Pure Water Removed This Quarter None Gallons
<br /> Permits for Discharge None DPES,POTW,etc
<br /> Current Remediation Techniques None
<br /> SVES,PSH Recovery)
<br /> Approximate De th to Groundwater 1 59 93 to 60 81 (Measured Feet
<br /> Groundwater Gradient 0 001 ft/ft Ma itude
<br /> Groundwater Flow Direction Variable Direction
<br /> Discussion On October 27, 2003, ATC Associates Inc (ATC)personnel gauged 17 groundwater monitoring wells at the site(Figures I
<br /> and 2) Depth to groundwater ranged from 59 93 (MW-13) to 60 81 (MW-7) feet below ground surface (bgs) The direction of
<br /> groundwater flow was generally northwesterly(Figure 3)with a calculated hydraulic gradient of approximately 0 001 ft/ft No measurable
<br /> phase-separated hydrocarbons (PSH)were recorded during this monitoring event Groundwater elevations and contours are illustrated on
<br />' Figure 3 and groundwater-monitoring data are presented in Table 1
<br /> On October 27, 2003, ATC purged and sampled monitoring wells MW-9 through MW-17 using the attached sampling procedures
<br /> described in Appendix A On October 28,2003,ATC collected discrete groundwater samples from MW-1 through MW-8 using a Conbar
<br /> stainless steel bomb sampler by lowering the sampling device to within approximately one foot of the bottom of the wells and opening the
<br /> sampling port MW-1 through MW-8 were sampled in response to a request by Mr Harlan Knoll of the SJCEHD on October 24, 2003
<br /> Field logs are also included in Appendix A The groundwater samples were analyzed for total petroleum hydrocarbons characterized as
<br /> gasoline (TPHg) by EPA Method 8015B, benzene, toluene, ethylbenzene, and total xylenes (BTEX) by EPA Method 8021B, fuel
<br /> t oxygenates methyl tert-butyl ether(MTBE),di-isopropyl ether(DIPE),ethyl tert-butyl ether(ETBE),tert-amyl methyl ether(TAME),and
<br /> tert-butyl alcohol(TBA), I,2-dichlorethane(1,2-DCA),and 1,2-dibromoethane(EDB)by EPA Method 8260B TPHg concentrations were
<br /> reported above the laboratory method Reporting Limit(RL)of 50 micrograms per liter(pg/L)in groundwater samples collected from 5 of
<br /> the 17 wells sampled this quarter Benzene concentrations were reported above the RL of 0 5 µg/L in groundwater samples collected from
<br />' 3 of the 17 wells sampled this quarter MTBE concentrations were reported above the RL of 2 0 pglL in groundwater samples collected
<br /> from 10 of the 17 wells sampled this quarter The highest TPHg, benzene, and MTBE concentrations reported were 5,000, 370, and 120
<br /> gg/L, respectively, in the groundwater sample collected from MW42 TBA was detected above the laboratory RL of 20 µg/L in
<br /> groundwater samples collected from 3 of the 17 wells sampled, the highest concentration reported was 50 µg/L in groundwater sample
<br />' collected from MW-9 1,2-DCA concentrations were reported above the laboratory RL ranging of 2 0 �ig/L in groundwater samples
<br /> collected from 8 of the 17 wells,the highest 1,2-DCA concentration reported was 87 gglL in the groundwater sample collected from MW-
<br /> 14 EDB, TAME, DIPE, and ETBE concentrations were reported below the laboratory RL of 2 0 Rg/L in the groundwater samples
<br /> collected from all 17 wells sampled TPHg, benzene, and MTBE concentrations are illustrated on Figure 2 and historic groundwater
<br /> analytical results are presented in Tables 1 and 2 Hydro ahs of groundwater elevations and analytical data are attached in ARpendix B
<br /> 4`6 Quarter 2003 Groundwater Report E-Z SERVE 4100966
<br /> S IEnvironmental125827126 StocktonlReports1EZ966(2003 Q4 GW RPI')doc ATC Project ANo 54 25827 2612
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