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Project No. 9688 WORK PLAN `" June 11, 1999 <br /> 2373 Mariposa Road Page 5 <br /> F 30-0 4.0 ND ND/ND/ND/ND -- <br /> F 36-0 ND ND ND/ND/ND/ND -- <br /> F 41-0 ND ND ND/ND/ND/ND - <br /> F 46-0 2.0 ND ND/ND/ND/ND -- <br /> F 50-6 12.0 IND ND/ND/ND/ND -- <br /> NOTES: TPH-D total petroleum hydrocarbons as diesel <br /> TPH-G total petroleum hydrocarbons as gasoline <br /> BTEX benzene/toluene/ethylbenzene/total xylenes <br /> ND Not detected at method limits <br /> -- Not analyzed (reason unknown) <br /> Because of inconsistencies in the analyses and the requirements of EHD, the <br /> soil investigation of October 1994 was not considered adequate and additional <br /> investigation was required which would include groundwater sampling. <br /> The following Chronology shows the significant work carried out at the site. <br /> The chronology is based on materials provided by Husky Crane Company. <br /> —/--/87 One 500 and one 1,000 gallon tanks last known to contain <br /> gasoline removed by unknown contractors from site. No EHD <br /> supervision. <br /> 10/15/91 Tank excavation area sampled by Geological Audit Services <br /> under supervision of EHD. <br /> 11/19/91 Geological Audit Services publishes Work Plan for excavation <br /> and Disposal. <br /> 06/—/92 Wm. J. Hunter & Associates hired by owner to review previous <br /> work and prepare a Work Plan for investigation. <br /> 11/--/92 Wm. J. Hunter & Associates publishes PAR and Work Plan for <br /> Soil Contamination Investigation. <br /> 08/--/94 Wm. J. Hunter & Associates publishes PAR and Work Plan for <br /> Soil Contamination Investigation. (different than ll/--/92 PAR <br /> and Work Plan). <br /> 11/—/94 Wm. J. Hunter & Associates publishes 'Results of Soil <br /> Contamination Investigation and request for Site Closure". <br /> 06/14/95 EHD publishes letter requiring additional work after receipt on <br /> 12/05/94 of Wm. J. Hunter & Associates 'Results of Soil <br /> Contamination Investigation and request for Site Closure". <br /> 04/13/99 Wm. J. Hunter & Associates returns all files to Husky Crane. <br /> Site Geology, Soil Conditions and Hydrogeology <br /> The site is in the Lower Sacramento Valley geologic setting. As such the soils <br /> in the area are alluvial extending many hundreds of feet before bedrock is <br /> WILLIAM DUBOVSKY ENVIRONMENTAL <br />