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ENVIRONIRENTAL HEALTH lowEPARTMENT <br /> PpU1N SAN JOAQUIN COUNTY <br /> -Za Donna K. Heron, R.E.H.S. Program Coordinators <br /> " L � .� Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S, R.D.I. <br /> Margaret Lagorio, R.E.H.S. <br /> Assistant Director Telephone: (209)468-3420 <br /> Robert McClellon,R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley, R.E.H.S. <br /> FEB 0 7 2DO7 <br /> MIKE DESSO MATT MACHADO <br /> NESTLE USA INC CITY OF RIPON <br /> 800 N BRAND BLVD 1210 VERA AVE <br /> GLENDALE CA 91203 RIPON CA 95366 <br /> RE: Former Nestle USA <br /> 230 Industrial <br /> Ripon, CA <br /> This is to inform you of a concern that San Joaquin County Environmental Health Department <br /> (EHD)has with the sealing of monitoring wells for the above referenced site with bentonite grout. <br /> Bentonite is an approved sealing material for the annualar space between the well casing and the <br /> borehole wall. There is concern about the structural incompatibility between bentonite seals and <br /> dense non-aqueous phase liguids including trichloroethylene (TCE). <br /> The original work plan for installation of additional monitoring wells for this site proposed a <br /> cement bentonite grout for sealing the annular space between the well casing(s)and the <br /> borehole. The California Well Standards and the San Joaquin County Well Standards specify <br /> that bentonite additives to cement be limited to 5 percent by volume. Because of problems with <br /> the casings after using this sealant, Environmental Cost Management (Nestle consultant) has <br /> changed to a bentonite sealant for the monitoring wells. <br /> The EHD requested that Environmental Cost Management obtain a statement from the bentonite <br /> manufacturer that it was an effective sealant for trichloroethylene and apparently the <br /> manufacturer is not willing to provide the assurance. <br /> Nestle USA Inc. and the City of Ripon are ultimately responsible for having to deal with the TCE <br /> contamination problems in the City of Ripon and the migration of contamination that may occur <br /> from use of incompatible sealing material in construction of these monitoring wells. Therefore, <br /> the decision to continue with bentonite seals on the monitoring wells will be left to you. <br /> If you have any questions contact me at(209)468-3449. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Margaret <br /> Program Coordinator Unit IV <br /> Cc: CVRWQCB—James Brownell <br /> Environmental Cost Management—Binayak Acharya <br />