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V 1117 Lone Palm Avenue <br /> Q Suite B <br /> Modesto CA 95351 <br /> r 209 579 2221 <br /> Fax 209 579 2225 <br /> December 8, 1998 ENVIRONMENTAL HEALTH DIVISION <br /> 13099 304 E Weber Ave Third Floor ' <br /> P O Box 388, Stpqkton CA 95201-0388 <br /> Approved ®, <br /> Mr Harlin Knoll DenieCondittiions M40 ami minqab 3 <br /> San Joaquin County Public Health rV"-(tyi � � <br /> Services, Environmental Health Division Date / / 9 ' by <br /> 304 E Weber Street, Third Floor <br /> Stockton, CA 95202 <br /> Subject Addendum to Summary Report of Additional Subsurface Investigation at Ripon <br /> Unified School District, 304 North Acacia Avenue, Ripon, California <br /> Dear Mr Knoll <br /> ATC Associates Inc has prepared this addendum to the Summary Report of Additional <br /> Subsurface Investigation dated November 4, 1998 ATC's recommendation in that report was <br /> that additional investigation activities appear to be necessary to delineate the vertical extent of <br /> petroleum hydrocarbon impacted soil and the horizontal extent of petroleum hydrocarbon <br /> impacted groundwater <br /> The additional investigation activities should include the advancement of three soil borings and <br /> completing the borings as groundwater monitoring wells to assess the extent of petroleum <br /> impacted groundwater In addition, one of the borings should be advanced using continuous core <br /> methods to a depth of at least 40 feet below ground surface to assess the vertical extent of <br /> petroleum impacted soil <br /> If you have any questions or require additional information, please contact us at (209) 579-2221 <br /> Respectfully Submitted, 3 <br /> ATC Associates Inc( <br /> R G�r-- I-Y"r— <br /> Drew Van Allen <br /> Staff Scientist �- <br /> Jea a Hornsey, P E <br /> -- <br /> Registered Engineer No C47410 <br /> cc Mr Leo Zuber -Ripon Unified School District <br /> w\13499Uettm\gLddsunu doc 1 <br />