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PUBL., HEALTH SER!,'ICES SAN JOAQUIN COUNTY JOGI KHANNA NL U..NIT H Healdi Officer P.O. Box 2009 0 (1601 East Hazelton Avenue) 9 Stockton, California 95201 ij 6- (209) 468-3400 December 19, 1991 Henry Hirata San Joaquin County Department of Public Works P.O. Box 1810 Stockton, CA Re: Harney Lane Landfill The Environmental Health Division and the staff of the California Integrated Waste Management Board have reviewed the Harney Lane landfill gas monitoring report dated November 1, 1991. Methane gas in excess of 5% volume in air was detected in nine (9) of the twelve (12) gas wells tested. This is in violation of CCR Title 14, Division 7, Chapter 3, Section 17783 . These test results indicate that the landfill 's methane gas may be migrating from the landfill boundary. It is apparent that further methane testing should be conducted to verify the accuracy of the November 1, 1991 report. It is appropriate at this time to request additional testing to verify if other toxic and/or carcinogenic compounds are migrating offsite. Below is the verification monitoring program for the Harney Lane Landfill: 1. All gas monitoring wells should be tested for methane gas monthly for the next six months as outlined in the 11 Landfill Gas Monitoring Plan Harney Lane Landfill" . The next sampling event shall occur before January 30, 1992 . 2 . All onsite structures must be tested for methane gas monthly for the next three months. Testing shall begin before January 30, 1992 . 3 . All structures in San Joaquin County Migrant Farm Labor Camp must be tested for methane gas monthly for the next three months. Testing shall begin before January 30, 1992 . 4 . Volatile Organic Compounds (VOC's) tests should be applied to GW-1, GW-4, and GW-10 before January 30, 1992 . Refer to the VOC's tests in the Harney Lane Air Quality SWAT Report dated September of 1988. On page .2-3 you will find the ten VOC's needed to be tested. A Division of%An Joaquin County Health Care Scrviccs