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PUBLIC TiEALTH SERVICES a�1M <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388; <br /> 209/468-3420Qc-,, `�i <br /> CYNTHIA ADKISSON JAN 16 19907, <br /> EAST BAY MUNICIPAL UTILITIES DISTRICT <br /> P O BOX 24055 <br /> OAKLAND CA 94623-1055 <br /> RE: TRC Site Closure and Request for Information at 1804 Main St., Stockton. Site Code: 1196 <br /> At the conclusion of our Monday, January 6, 1997 Technical Review Committee (TRC) meeting which <br /> reviewed your request for closure the members of the TRC voted unanimously to close the above <br /> referenced site pending the submittal of additional information with the conditions provided below. <br /> This letter serves to formally list those items needed to finalize your closure request. Upon receipt,review <br /> and approval of these items listed below San Joaquin County Public Health Services-Environmental Health <br /> Division (PHS/EHD) will prepare a site closure summary and chronology and submit the Final Closure <br /> Request Addendum to the Central Valley Regional Water Quality Control Board (CVRWQCB) for a 30 <br /> day concurrence review period. <br /> Please provide the following information at your earliest convenience: <br /> 1. Current total depth, depth to water, and groundwater elevation of MW-8, current analysis of <br /> groundwater from MW-8 by a California certified laboratory for total petroleum hydrocarbons as gasoline, <br /> benzene, toluene, ethylbenzene, xylene, MTBE and Dissolved Oxygen. In the event these parameters are <br /> not significantly different from previous trends established at the site no additional sampling will be <br /> required by this agency. PHS/EHD Site Mitigation Unit staff must witness the collection of this data, <br /> provide 48 hours advanced notice to the contact person listed below. <br /> 2.Modify Figure 9 to include HP-5 in the"approximate petroleum hydrocarbon plume boundary". <br /> 3. Estimate and plot the lateral and vertical extent of fuel hydrocarbon mass residing in both soil and <br /> groundwater,include total petroleum hydrocarbons as gasoline,benzene,toluene,ethylbenzene,xylene and <br /> MTBE(show all calculations and provide a brief rationale for the values and depiction's presented). <br /> 4. Correct any erroneous data or analytical units listed in Table C-1 of the final closure report. <br /> 5. Supply supporting data confirming or refuting the March 1996 groundwater elevation reported as 2 feet <br /> bgs,and provide justification for any changes to this reported water level in the event the original data was <br /> reported in error. In the event groundwater was significantly over the well screen intervals,provide a brief <br /> discussion regarding the quality of this March 1996 data and its relationship to your closure request. <br /> 6.Tabulate all soil data and include sample designation,date of sample,depth bgs,and analytical results. <br /> 7. Modify Table C-2 to include depth to water for each well for each sampling event. <br /> 8. Complete the addendum with a signature from an appropriately registered professional. <br /> A Division of San Joaquin County Health Care Services <br />