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ENVIRONMENTAL HEALTH DEPARTMENT SAN JOAQUIN COUNTY Unit Supervisors Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman.R.E.H.S. Director Mike Huggins,R.E.H.S..R.D.I. Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. Program Manager Telephone: (209) 468-3420 Margaret Lagorio.R.E.H.S. iFi 60 Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. Program Manager Mark Barcellos,R.E.H.S. October 19,2004 ATTN: Ed Sido San Joaquin Housing Authority 448 S.Center St. Stockton,CA 95203 RE: Methane gas monitoring requirements for housing camp located at 14320 E.Harney Ln.,Lodi,CA.(APN#06503003) The San Joaquin County Environmental Health Department(EHD) is sending you a notice concerning the housing camp located at 14320 E. Harney Lane,Lodi,CA. The EHD has determined pursuant to Title 27,California Code of Regulations (27 CCR) that a methane gas monitoring system is required inside buildings within 1000 feet of the boundary of any disposal area. The code section that applies to the above listed property is listed below: Title 27 CCR,Section 21190,Postclosure and Land Use (g) All on site construction within 1,000 feet of the boundary of any disposal area shall be designed and constructed in accordance with the following,or in accordance with an equivalent design which will prevent gas migration into the building, unless an exemption has been issued: (1) a geomembrane or equivalent system with low permeability to landfill gas shall be installed between the concrete floor slab of the building and subgrade; (2) a permeable layer of open graded material of clean aggregate with a minimum thickness of 12 inches shall be installed between the geomembrane and the subgrade or slab; (3) a geotextile filter shall be utilized to prevent the introduction of fines into the permeable layer; (4) perforated venting pipes shall be installed within the permeable layer, and shall be designed to operate without clogging; (5) the venting pipe shall be constructed with the ability to be connected to an induced draft exhaust system; (6) automatic methane gas sensors shall be installed within the permeable gas layer, and inside the building to trigger an audible alarm when methane gas concentrations are detected;and (7) periodic methane gas monitoring shall be conducted inside all buildings and underground utilities in accordance with Article 6,of Subchapter 4 of this chapter(section 20920 et seq.). After review,the EHD has determined that the housing camp is located within 1000 feet of the closed Harney Lane Landfill,and must comply with Title 27 CCR,Section 21090(8)(6)and(g)(7). Conditions six and seven,listed above, need to be complied with. Within 30 days of receipt of this notice, a written response from your agency needs to be submitted to EHD explaining how the methane gas monitoring sensors will be installed and what date the monitors will be operational. If you have any questions please contact Ted Tasiopoulos R.E.H.S.at(209)953-7698. 41LJIIC� cklu_ Robert McClellon,Supervisor R.E.H.S. Environmental Health Department Enclosures Cc: Gino Yekta,CIWMB