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s.` 1117 Lone Palm Avenue <br /> V �? Suite <br /> Modesto, CA 953511 <br /> 209.579.2221 <br /> ,h <br /> Fax 209.579.2225 <br /> A S S O C I A T E S t N C . <br /> I� <br /> December 8, 1995 ENVIRONMENTAL HEALTH DIVISION <br /> 13099 304 E. Weber Ave. Third Floor <br /> P. O. Sox 388, S 4kcton CA 95201-0388 <br /> f Approved <br /> Denied <br /> Mr. Harlin KnollqA <br /> ,� � ?�ri�� 1a <br /> San Joaquin County Public Health <br /> Services, Environmental Health Division Date ZJi qJ 7F by <br /> 304 E, Weber Street, Third Floor <br /> Stockton, CA 95202 <br /> i <br /> Subject: Addendum to Summary Report of Additional Subsurface Investigation at Ripon <br /> Unified School District, 304 North Acacia Avenue, Ripon, California <br /> lm <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 /> F that additional investigation activities appear to be necessary to delineate the vertical extent of <br /> petroleum hydrocarbon impacted soil and the horizontal 1,t:extent of petroleum hydrocarbon <br /> impacted groundwater. <br /> C 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. 0 <br /> If you have any questions or require additional information, please contact us at (209) 579-2221. <br /> I <br /> Respectfully Submitted, <br /> ATC Associates Ince <br /> Ute— lam"- <br /> �k <br /> Drew Van Allen <br /> Staff Scientist ' <br /> Je a Homsey, P.E. <br />€ .i <br /> i4 <br /> Registered Engineer No. C47410 <br /> P - <br /> cc: Mr. Leo Zuber-Ripon Unified School District <br /> wA13099Vcttmkaddsumi.doc 1 <br /> t <br /> E <br />