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California egio ter Quality t4ntrol Board ; - Central Valley Region Robert Schneider,Chair J NVinston I1. I ickox Gray Davis Secrelan,fior Sacramento Main Office GO11cr"or Environmental Internet Address: littp://w%%,",.s%%Tcb.ca.gov/rwgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 , Phone(916)255-3000•FAX(916)255-3015 ; Mr. W. Michael Carroll 29 Januar' 002 San Joaquin County Dept. of Public Works Solid Waste Division P.O. Box 1810 Stockton, CA 95201 CORRAL HOLLOW SANITARY LANDFILL, WORKPLAN FOR THE INSTALLATION OF A DEEP GR 0 UND ff,A TER MONITORING WELL MW-6,SANJOA QUIN COUNTY, Case No. 1896 We have reviewed the subject document dated 16 November 2001. Waste Discharge Requirements(WDRs) Order No. 5-01-176, Provision G.12.0 requires adequate monitoring of the vadose zone and deeper groundwater under the southwestern half of the landfill as required by a Detection Monitoring program pursuant to Title 27, California Code of Regulations. WDRs Finding 19 states, "The Discharger's detection monitoring program for groundwater at this Unit does not satisfy the requirements contained in Title 27 §20415. Whereas the shallow groundwater monitoring on the northeastern side of the landfill does monitor the first encountered groundwater, the first groundwater beneath waste within the southwestern half of the waste management unit has no monitoring system currently in place. Wells that previously monitored deeper groundwater in compliance with Title 27 have been dry since 1990. Appropriate monitoring of groundwater beneath the southwestern half of the landfill should be implemented again." The Workplan proposes MW-6 be located in the northeast corner of the site because a down-gradient well fulfills the requirement that the deep groundwater be monitored, and also will adequately monitor the deeper groundwater at the site. We concur that the County's recommended MW-6 well be located on the northeast corner as described. Our concurrence with this location is also based upon the fact that groundwater continues to be impacted at MW-5,the shallow well in this same northeast comer. We do not agree that this well "will adequately monitor the deeper groundwater at the site." The County remains responsible for ensuring that an adequate Detection Monitoring system is in place as defined in Finding 19 above. We recommend that the County drill MW-6 at the proposed location by 1 March 2002. Appropriate monitoring of groundwater beneath the southwestem half of the landfill must still be implemented according to Title 27 §20415. Therefore,we request the County submit a workplan,with a time schedule,that proposes the drilling of MW-7 that will monitor groundwater at the southwestern half of the landfill. Please provide this workplan by 1 May 2002. If you have any questions,please contact me at(916)255-3137. K A. SCHWAB,RG Associate Engineering Geologist Cc: Robert McClellon, San Joaquin County Department of Environmental Health, Stockton Kas:Corral MW-6 workplan 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