CORRESPONDENCE_1991-2001 - Laserfiche WebLink

Home Browse Search

California Rtegional Water QualityC trot Board Central Valley Region' - . * , , Robert Schneider,Chair _. NVinston H.Hickox Gray Davis Secretary for Sacramento Main Office PM 12: r Governor Environmental Internet Address: http://w%NNv.swrcb.ca.gov/rwgcb5 Protection 3443 Routicr Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3015 19 June 2001 Mr.Michael Kalish County of San Joaquin Department of Public Works P.O. Box 1810 Stockton, CA 95201 REVIEW OFFIRST QUARTER 2001 A10NITORING REPORT, CORRAL HOLLOW SANITARY LANDFILL,SANJOA QUIN COUNTY(CASE NO. 1896) Regional Board staff has reviewed the Corral Hollow Sanitary Landfill,First Quarter 2001,Groundwater and Surface Water Monitoring Report, dated 15 April 2001. Based on our review we noted the following: Monitoring Well 5 (MW-5) analysis showed increasing trends for the following water parameters and constituents: electrical conductivity,TDS,chloride, cis-1,2-Dichloroethene,Tetrachloroethene and Vinyl Chloride and decreasing trends for pH,turbidity,Acetone and Dichloroflouromethane.Acetone was also detected in Monitoring Well SB-1. Since Acetone is a common laboratory contaminant,and was found in both the trip blank and field blank,the County considers the detection a false positive and did not resample. However,the County will reconsider the Acetone detections in the Second Quarter Monitoring Event. Monitoring Well 4 (MW-4) analysis showed an increase in chloride that the County believes to be an error. Since the reported concentrations of sulfate are much lower than the historical data,the County believes that the values may have been switched while the report was being generated. .Therefore,the County performed additional analysis on this data,and determined an exceedance has not occurred and no increasing trend in chloride was noted in MW-4. The color of the groundwater in SB-1 was reported as red in the Fourth Quarter 2000 monitoring event. The First Quarter 2001 reported the purged water in SB-1 as clear to pink with low to moderate turbidity. Purple/pink chunks were visible on the PVC bailer.The nature of the discoloration is unknown,but preliminary investigation indicates that the discoloration is not impacting the groundwater.The color in MW-4 was light brown with moderate turbidity.The color of both surface water samples were brown with high turbidity. The County will continue to monitor the nature of the discoloration of purged water. If you have any questions or comments regarding my review,please call me at(916)255-3126. VICTOR J. O Senior Engi eering Geologist, cc.: Robert McClellon,REHS,Public Health Services,Environmental Health Division California Environmental Protection Agency �.a Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 i