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Chorea RAggional Water Qualityotrol Board <br /> Central Valley Region <br /> Steven T.Butler,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office f ' j` Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/--lwqcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> NOTICE OF VIOAIO <br /> 18 August 1999 <br /> Mr. Wes Johnson <br /> County of San Joaquin,Department of Public Works <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> REVIEW OF'9Z4R1VTYLANE SANITAR YLANDFILL,SECOND QUARTER 1999, <br /> GROUND WA TER AND SURFACE WATER MOATTORLVGREPORT"SANJOAQUIN <br /> COUNTY <br /> Regional Board staff has reviewed the Harney Lane Sanitary Landfill, Second Quarter 1999, <br /> Groundwater and Surface Water Monitoring Report, dated 15 July 1999. The closure and post-closure <br /> maintenance of Harney Lane Sanitary landfill is regulated under Waste Discharge Requirements Order <br /> No. 96-139 (WDRs). During the second quarter of 1999 the groundwater flow direction is documented <br /> as westerly. In violation of the concentration limits set in the WDRs, volatile organic compounds <br /> (VOCs) were detected in monitoring wells MW-1 and MW-2. The detection of the VOCs is considered <br /> a release. It is also noted that differential settlement has occurred on the landfill surface. Staff has the <br /> following specific comments: <br /> 1. The concentration limits for MW-1, an upgradient well located very close to the edge of the <br /> waste, is"detect"'for VOCs. In violation of the WDRs, chlorobenzene and 1,4-dichlorobenzene <br /> were detected at low concentrations in W-1. Chlorobenzene was detected at 0.4 µg/l and 1,4- <br /> dichlorobenzene was detected at 1.5 µg/l. <br /> 2. Previous detections of VOCs have been sporadic in MW-2 therefore numeric concentration <br /> limits for some VOCs are indicated in the WDRs. Two VOCs detected in MW-2 during the <br /> second quarter include dichlorodifluoromethane(freon 12) and tetrachloroethylene (PCE). PCE <br /> was detected at a concentration of 0.8 µg/l,which is equivalent to the concentration limit <br /> specified by the WDRs. Freon 12 was detected in MW-2 at 56 µg/l. San Joaquin County <br /> reports that statistical analysis indicates that this concentration is not considered"statistically <br /> significant",however the concentration limit for Freon 12 specified in the WDRs is 4.0 µg/l. <br /> Additionally, chloride in MW-2, although detected at less than the concentration limit, is <br /> reported as having an increasing trend. An increasing trend of chloride indicates that leachate <br /> may be impacting groundwater. <br /> 3. According to Title 27, §20420(1) and as described by the Standard Provisions and Reporting <br /> Requirements,when a release is noted,the discharger shall"immediately notify the Board <br /> verbally as to the Monitoring Point(s) and constituent(s)..., shall provide written notification by <br /> certified mail within seven days of such determination, and shall carry out a discrete retest." <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />