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�o <br /> California Rt,b,tonal Water Quality Antrol Board ; <br /> Central Valley Region �, - . ? <br /> Steven T.Butler, Chair <br /> mss. <br /> Winston aH.r Hickox D -r;V1f <br /> = is <br /> Secretaryjot Sacramento Main OfficejJ <br /> Environmental Internet Address: http://www.s%Tcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-300 <br /> Phone(916)255-3000•FAX(916)255-3015 MAY 0 2000 <br /> 5 May 2000 NOLTE ASSOCIATES INC. <br /> Mr. Jerry DeGroot Mr. RoATger Swenby <br /> DeGroot and Sons Suprema Specialties West, Inc. <br /> 908 Ruby Court 14253 South Airport Way <br /> Ripon, CA 95366 Manteca, CA 95336 <br /> CONDITIONAL APPROVAL OF GROUNDWATER MONITORING WORKPLAN, <br /> WASTEWATER TREATMENTAND DISPOSAL FACILITY, MANTE CA, SANJOA QUIN <br /> COUNTY <br /> I have reviewed the Land Application Site, Groundwater Monitoring Workplan, prepared by Nolte <br /> Associates, Inc., dated April 2000. The plan was prepared in accordance with Provision F.4 of Waste <br /> Discharge Requirements (WDRs) No. 5-00-057. After reviewing the workplan, I have the following <br /> comments: <br /> • Monitoring Wells MW-1 and MW-2 are located adjacent to the South San Joaquin Irrigation <br /> Canal and may be influenced by irrigation water quality and localized groundwater mounding. <br /> The wells should be located far enough away from the canal to provide data representative of <br /> local groundwater conditions. <br /> • The Workplan states that the wells will be drilled by the mud rotary method; however, your <br /> consultant recently informed me that you now plan to use the hollow stem auger method. This <br /> change is acceptable. <br /> • A five-foot length of bentonite transition seal is excessive and difficult to hydrate; a two-foot <br /> thick transition seal is adequate for shallow groundwater monitoring wells. <br /> • Number 30 sand is specified as the filter pack material. Number 3 sand is commonly used with <br /> 0.020-inch slot size. <br /> • The percentage of bentonite in the bentonite/cement slurry well grout is not stated. Please limit <br /> the bentonite percentage to a maximum value of six-percent by weight to prevent excessive <br /> shrinkage of the cement mix. Alternatively, use no bentonite in the neat cement. <br /> • Consider using two-inch inside diameter wells, as less development is required to consolidate <br /> and remove fines from the filter pack. Surging the well casing after installing the sand pack but <br /> prior to installation of the transition seal is also recommended. <br /> California Environmental Protection:Agency <br /> C51 Recycled Paper <br />