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California a iol Water Quality Pontrol Boar <br /> Central Valley Region <br /> Steven T.Butler,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 28 May 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-CORRAL HOLLOWSANITARYLANDFILL, FIRST QUARTER 1999, <br /> GROUNDWATER AND SURFACE WATER MONITORING REPORT°',SAN JOAQUIN COUNTY <br /> (CASE NO. 1896) <br /> Regional Board staff has reviewed the Corral Hollow Sanitary Landfill, First Quarter 1999, <br /> Groundwater and Surface Water Monitoring Report, dated 15 April 1999. We understand that during <br /> the second quarter of 1999, your sampling consultant will report the well recovery time for the <br /> purging/sampling events. Additionally, during the second quarter 1999,the Standard Observations will <br /> be recorded on the summary sheets that you have developed. You included a copy of this form as <br /> Appendix G in the first quarter 1999 report. This report also includes the annual summary report for <br /> 1998. <br /> Volatile organic compounds were detected in monitoring well MW-5 during first quarter sampling and <br /> an increasing trend has been noted. The Annual Report summary in Appendix H indicates that a landfill <br /> gas collection system is being implemented at the Corral Hollow Sanitary Landfill. Please inform this <br /> staff of the schedule for system operation and your plans to evaluate the effect of the gas extraction on <br /> the groundwater VOC plume. As noted in the Notice of Violation dated 6 April 1999,the extent of this <br /> VOC plume must still be evaluated. A workplan to complete this work is due by 30 July 1999. <br /> I would like to arrange an appointment with you to inspect the landfill. I will telephone you to arrange a <br /> date for the inspection. If you have any questions or comments regarding our review,please call me at <br /> (916) 255-3140. <br /> WENDY W. ARANO <br /> Associate Engineering Geologist <br /> cc.: Robert McClellon,RENS, Public Health Services,Environmental Health Division <br /> WWA <br /> cAprojects\sanjoaqu\corralho\l Q991tr.doc <br /> California Environmental Protection Agency <br /> 0?Recycled Paper <br />