|
' DATE February 20, 2003
<br /> QUARTERLY GROUNDWATER MONITORING REPORT-FIRST QUARTER 2003
<br /> Facility Former E-Z Serve No 100966 Site Address 2537 Waterloo Road Stockton,California
<br /> Responsible,Party/Contact Person RPMS-CAI Jeff Burke
<br /> Consultor Co /Contact Person ATG Associates Inc /Michael T Davis Project Manager 85$ 569-0692
<br /> ATC Proj e No 43 25827 0026
<br /> Regulatory A enc /CRW CB Case No County of San Joaquin Department of Environmental Health/390499
<br />' WORK PERFORMED THIS QUARTER [January 1,2003-March 31,2003]
<br /> 1 Performed first quarter groundwater monitoring and sampling
<br /> 2 Submitted Additional Site Assessment Report
<br />' 3 Submitted Corrective Action Plan(CAP)
<br /> 4 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 Prepare Workplan to conduct additional off-site site assessment
<br /> 3 Obtain CAP approval from the CRWQCB
<br /> 4 Submit second quarter groundwater monitoring report
<br /> Current Phase of Project Assessment Assessment,Remediation,etc
<br /> Frequency of Sam ling Quarterly (Quarterly,etc
<br /> XLEVency of Monitoring quarterly onthl ,etc _ µ
<br /> Liquid Phase Hydrocarbons Present On Site No e"'o
<br /> Cumulative PSH Recovered to Date Unknown Gallons
<br /> PSH Recovered This Quarter None Gallons
<br />'. Pure Water Removed This Quarter 385 Gallons
<br /> Permits for Discharge None PES,POTW,etc
<br /> Current Remediation Techniques None SVES,PSH Recovery)
<br /> Approximate Depth to Groundwater 55 04 to 55 92 Measured Feet
<br /> Groundwater Gradient 0 001 ft/ft (Magnitude)
<br /> Groundwater Flow Direction Northwesterly Direction
<br />' Discussion On January 16,2003, ATC Associates,Incorporated(ATC)personnel gauged purged and sampled 16 groundwater monitor
<br /> wells,three(3)vapor extraction wells(VW-1,VW-2, and VW-3), and one(1)groundwater extraction well(EX-1) at the site(Figures 1
<br /> and 2) Depth to groundwater ranged between 55 04 (MW-13) to 55 92 (MW-14) feet below ground surface (bgs) The direction of
<br /> groundwater flow was northwesterly with a calculated hydraulic gradient of approximately 0 001 ft/ft, respectively (Figure 2) No
<br /> measurable phase-separated hydrocarbons (PSH) were recorded during this monitoring event Groundwater elevations and contours are
<br /> illustrated on Figure 2 and groundwater-monitoring data is presented in Table 1 _
<br />' On January 16, 2003, ATC purged and collected groundwater samples from 16 monitoring wells, 3 vapor extraction wells, and 1
<br /> extraction well ATC utilized the attached sampling procedures described in Appendix A to collect groundwater samples from MW-i,
<br /> MW-2,MW-3, MW-4,MW-5, MW-6,MW-7,MW-8, MW-9, MW-10,MW-11,MW-12,MW-13, MW-14, MW-15, MW-16, MW-17,
<br /> VW-1, VW-2, VW-3, and EX-1 Field logs are also included in Appendix A Groundwater samples collected were analyzed for total
<br />' petroleum hydrocarbons characterized as gasoline (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX), fuel oxygenates
<br /> methyl tert-butyl ether(MTBE),di-isopropyl ether(DIPE), ethyl tert-butyl ether(ETBE), tert-amyl methyl ether(TAME),and tett-butyl
<br /> alcohol(TBA), 1,2-dichlorethane(1,2-DCA),and 1,2-dibromoethane(EDB)by EPA Test Method 8260 and GC/MS Combination TPHg
<br /> concentrations were reported above the laboratory Practical Quantitation Limit(PQL) of 50 micrograms per liter(µg/L) in groundwater
<br />' samples collected from ten (10) of the nineteen(19) wells sampled this quarter The highest TPHg,benzene,and MTBE concentrations
<br /> reported were 28,000, 8,800,and 330 gg/L,respectively,in the groundwater samples collected from VW-I and EX-1 (MTBE) TBA was
<br /> detected above the laboratory PQL ranging from 5 0 to 1,000 gg/L in 10 wells sampled,the highest concentration reported was 210 gg/L
<br /> in groundwater samples collected from EX-1 1,2-DCA concentrations were reported above the laboratory PQL ranging from 0 5 to 100
<br />' µg/L in 16 wells, the highest 1,2-DCA concentration reported was 180 µg/L in groundwater samples collected from MW-14 EDB,
<br /> TAME, and DIPE concentrations were reported below their laboratory PQL ranging from 0 5 to 1,000 gg/L in the 19 wells sampled
<br /> TPHg, benzene, and MTBE concentrations are illustrated on Figure 2 and historic groundwater analytical results are presented in Tables
<br /> I and 2 Hydrographs of groundwater elevations and analytical data are attached in Appendix B and complete laboratory analytical
<br />' results and chain-of-custody documentation are attached in Appendix C
<br />' I's'Quarter 2003 Groundwater Report,&Z SER VE #100966 ATC Associates Inc
<br /> S 11E-Z Setve11009661Reports1EZ966GWR002 ATC Project No 43 25827 0026
<br />
|