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PUBLIC HEALTH SERVICES aa �o <br /> SAN JOAQUIN COUNTY ' <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer., �t <br /> 304 East Weber Avenue,Third Floor • Stockton, CA 95202 L►xo>�� <br /> 209/468-3420 <br /> CARL NAVARRA SITE CODE 1392 <br /> 475 BLEWETT ROAD <br /> TRACY CA 95375 <br /> RE: NAVARRA PROPERTY <br /> 7500 ELEVENTH STREET <br /> TRACY,CA 95376 <br /> WORKPLAN: W rk Plan for Extended rte Characterization - t 2001 <br /> DATED: 10/01 <br /> PREPARED BY:San oa uin Com an Inc. <br /> APPROVED X with conditions,see below <br /> DISAPPROVED ❑ <br /> ADDENDUM ❑ Submit by: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN 9H&5 25299.37,subd.(c)(3).): <br /> 1. Installation of MW-3A and MW-3B to investigate the vertical extent of the plume. MW-8 to define easter <br /> limit of plume. MW--9 to investigate downgradient and MW-10 to define western limit of plume in down <br /> gradient area. PHS/EHD recommends MW-11 should be replaced with two discretely screened wells. PP-15 <br /> to determine the proper location of MW-10. <br /> 2. Soil samples will be analyzed for TPHd,TPHg,and BTEX using EPA approved methods of Analysis. <br /> 3. The grab groundwater sample collected from PP-15 will also be analyzed for MtBE using an EPA approved <br /> method of Analysis. <br /> 4. Groundwater samples will be analyzed for TPHd,TPHg,and BTEX using EPA approved methods of Analysis, <br /> and fuel oxygenates(TBA,MtBE,DIPE,ETBE,and TAME)using 8260A. <br /> GOMMENTS AND CONDITIONS: <br /> 1. PHS/EHD does not approve of the use of screen intervals greater than 20 ft. For exploration at a greater <br /> depth near proposed MW-1 I,PHS/EHD directs that two discretely screened wells be installed. <br /> 2. Please provide a complete sensitive receptor survey. Contact the Department of Water Resources, <br /> municipal water suppliers and nearby industries for well information. Submit any known construction <br /> details of the wells and whether the wells have been abandoned or are still in use. <br /> 3. PHS/EHD recommends installing MW-9 further south,to be located between the plume and the water <br /> supply well located at 23950 Chrisman Road. <br /> 4. Copies of all reports for this site must be sent to Marty Hartzell with CVRWQCS. <br /> 5. Comment for your information,the monitoring wells at 7474 W. Eleventh have been destroyed,the old <br /> water supply well has been destroyed and a new well was installed in the northeast portion of the property. <br /> DATED 10/26/01 BY Rebecca E. Setliff FHS <br /> cc: CVRWQCB-Marty Hartzell <br /> The San Joaquin Company Inc.—D.J.Watkins,Ph.D.,P.E. <br /> A Division of San Joaquin County Health Care Services <br />