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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Winston H.Hickox <br /> Steven T.Butler,Chair `��' �` � �°'� <br /> ..�_ <br /> Gray Davis <br /> Secretaryfor Sacramento Main Office ' / Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwqcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 12 October 1999 <br /> Mr. Wes Johnson <br /> County of San Joaquin <br /> Department of Public Works <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> REVIEW OF R'OLLOWSANITARYLAXOFILL, TIffRD QUARTER 1-999, <br /> GROUNDWATER ANDNIRFACE WATER ONITO"NGREPORF"SANJOAQULV <br /> COUNTY(CASENO. 1"6) <br /> Regional Board staff has reviewed the Corral Hollow Sanitary Landfill, Third Quarter 1999, <br /> Groundwater and Surface Water Monitoring Report, dated 15 October 1999. As noted during the <br /> previous three quarters, samples from monitoring well MW-5 have detected volatile organic compounds <br /> (VOCs). Additionally, increasing trends for monitoring well MW-5 are noted for electrical conductivity, <br /> TDS, and chloride. A decreasing trend is indicated for pH. <br /> We have scheduled a meeting to discuss the issue of volatile organic compounds in the shallow <br /> groundwater and need for additional monitoring of the deeper aquifer. <br /> You also indicated that the well recovery times were not noted by your consultant this quarter and that <br /> you will discuss this issue with them. I have attached a copy of the Monitoring Report Compliance <br /> Checklist that will be included in the case file for Corral Hollow Sanitary Landfill. <br /> If you have any questions or comments regarding my review,please call me at my new telephone <br /> extension, (916) 255-3137. <br /> WENDY W. ARANO <br /> Associate Engineering Geologist <br /> cc.: Robert McClellon,RENS,Public Health Services,Environmental Health Division <br /> Attachment <br /> WWA <br /> c:\projects\sanjoaqu\corralho\3Q991tr.doc <br /> California Environmental Protection Agency <br /> co Recycled Paper <br />