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Amk <br /> California ~ Conal Water Quality Control oar <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretary for 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 /> 25 July 2001 u L� <br /> Mr.Michael Kalish <br /> J`) Z001 <br /> County of San Joaquin <br /> Department of Public Works ' ' <br /> P.O.Box 1810 <br /> Stockton, CA 95201 <br /> REVIEW OF SECOND QUARTER 2001 MONITORING REPORT, CORRAL HOLLOW SANITARY <br /> LANDFILL,SAN JOA QUIN COUNTY(CASE NO. 189 6) <br /> Regional Board staff has reviewed the Corral Hollow Sanitary Landfill, Second Quarter 2001, Groundwater and <br /> Surface Water Monitoring Report, dated 15 July 2001. Based on our review we noted the following: <br /> Monitoring Well 5 (MW-5)analysis showed detections of benzene,chloroform, dichlorodiflouromethane, 1,1 <br /> dichloroethane, cis-1,2 dichloroethene, 1,2 dichloropropane,methylene chloride,PCE, trichloroflouromethane, <br /> trichloroethene, and vinyl chloride. The County has determined that MW-5 is an impacted well. The County <br /> will continue to use the trend analysis method quarterly to evaluate the concentrations of VOCs in MW-5. <br /> Benzene was also detected in MW-4. The spike in chloride concentrations noted in the First Quarter appear to <br /> have been switched with the sulfate values while the report was being generated. This value was clearly an error. <br /> Acetone,benzene,napthalene, and 1,2,3 trichlorobenzene were detected in SB-l. The County was to reconsider <br /> the acetone detections in this monitoring event,but there was no discussion of the continued presence in the <br /> report. A retest of SB-1 will occur during the Third Quarter 2001 monitoring event due to the short period of <br /> time between the County receiving the data and the next scheduled monitoring event. <br /> Other than chloroform and methylene chloride,no other VOCs were detected in the trip and/or field blanks. <br /> The nature of the pink coloration of the water in SB-1 is still unknown and the County is continuing to <br /> investigate its source. <br /> If you have any questions or comments regarding my review,please call me at(916)255-3126. <br /> VICeRi. ZO <br /> Senior Engineering Geologist <br /> Attachments <br /> cc.: Robert McClellon,REHS,Public Health Services,Environmental Health Division <br /> California Environmental Protection Agency <br /> �c3 Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swreb.ca.gov/rwgcb5 <br />