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• First Quarter 1998 Groundwater Monitoring Report <br /> Colberg Boat Works,401 North Stockton Street, Stockton,California <br /> Page 3 <br /> Groundwater Sampling and Analysis <br /> On January 22, 1998, Apex personnel collected groundwater samples from monitoring wells MW- <br /> 1 through MW-6 in accordance to the Apex SOP included as Appendix B The samples were <br /> submitted, under chain-of-custody documentation, to California Laboratory Services of Rancho <br /> Cordova, California, a state-certified analytical laboratory The samples were analyzed for <br /> concentrations of total petroleum hydrocarbons, as gasoline (TPHg) and diesel (TPHd), by <br /> Modified EPA Method 8015, and benzene, toluene, ethylbenzene, and total xylenes by EPA <br /> Method 8020 The samples were also analyzed for concentrations of five oxygenates (MTBE, <br /> DIPE, TAME, TBA and ETBE)by EPA Method 8260 The analytical results are summarized in <br /> Table 2 The laboratory analytical reports and chain-of-custody form are included in Appendix C <br /> Figure 4 shows the distributions of TPHg, TPHd and benzene in the shallow groundwater on <br /> January 22, 1998 at the subject site <br /> RECOMMENDATIONS <br /> :apex recommen ft &,Jfor oxygenate constituents with ;,I the' p TBE � <br /> in wells MW-1, MW-2 and MW-3, which would be analyzed in subsequent samples by EPA <br /> Method 8020 Apex further recommend 4r TR wells MW-1, MW-2 <br /> and MW-3 Apex is in the process of seeking pre-approval from the Mate UST Cleanup Fund for <br /> the _ a d� $xo�orm�well as requested by San Joaquin County Environmental <br /> 0 Hea lvislon Once a pre-approval is granted, Apex will submit a workplan for the requested <br /> work <br /> REPORT DISTRIBUTION <br /> Apex submitted a copy of this report to <br /> 1 Mr Steve Sasson <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95201 <br /> Ms Elizabeth Thayer <br /> Central Valley Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3015 <br /> D 1_PROJECTICOLO 1 001-COLBERG 130AT WORK SIQMR02981QM20298 DOC <br />