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v1117 Lone Palm Avenue <br />Suite .B <br />Modesto, CA 95351 <br />a �h � Al- ? 209.579.2221 <br />{ r'�1�, I Fax 209.579.2225 <br />A S 5 O C 1 A 7 E S I' N C <br />May 4,1999 . <br />13099 <br />Mr. Harlin Knoll <br />San Joaquin County Public Health <br />Services, Environmental Health' Division <br />t 304 E. Weber Street, Third Floor <br />Stockton, CA 95202 <br />SubJect:' Addendum'to Summary Report of Additional Subsurface Investigation at Ripon'. j <br />Unified School' District, 304 North Acacia Avenue, Ripon, California <br />Dear Mr. Knoll: <br />ATC Associates Inca has prepared this addendum to the Summary-. Report .of Additional <br />Subsurface Investigation dated April 7, 1999: ATC's recommendation in that report was that <br />additional investigation � activities .appear , to'.be '' ne'ce`ssary to delineate the horizontal extent of <br />petroleum hydrocarbon impacted groundwater. These recommendations included the installation <br />of two .groundvvater-rndnitoring wells. <br />ATC .is recommending that additional investigation activities 'be postponed until at". least one <br />more quarter of groundwater. monitoring has been conducted" The additional data will allow the <br />groundwater gradient to. be more accurately evaluated, prior:.to .the installation of the additional <br />monitoring wells. The groundwater monitoring event Will be conducted at the end of April 1999. <br />If you have any questions orrequire additional.information, please contact us at (209) 579-2221. x <br />Respectfully' Submitted, <br />f��C Assoc.ates Inc. <br />Drew Van Allen <br />I Staff Scientist <br />Jeanne Homsey, P.E. <br />Ik: Registered .Engineer.:No-.. ;C474 f 0- <br />E cc.-.." . LMr. Leo-.Z"&r-.Ripon'`Unified School:_Distriet " <br />w:11309911ettersWdwe11'.d6c F. <br />