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San Joaquin County <br /> y ".' DIRECTOR <br /> vii° ental t t <br /> 0 Donna Heran,REHS <br /> . 600 East Main Street <br /> - t c Ct®Ci, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> ® �q <br /> 6'V. ebsite: �'�/t�w.sjgov.orglehd Kasey Foley,RENS <br /> G ® Linda Turkatte,REHS <br /> i�cr�ea (249) 469-34.24 <br /> Fax: (209) 464-0138 <br /> March 20, 2012 <br /> Jay Famine, Contracted Engineer <br /> URS Corporation <br /> Crown Corporation Center <br /> 2870 Gateway Oaks Dr., Suite 150 <br /> Sacramento, CA 95833 <br /> SUBJECT: COMPREHENSIVE GAS MONITORING AT WORLD ENTERPRISES <br /> Dear Mr..Famine, <br /> The ED has initiated a Comprehensive Gas Monitoring Program(CGMP). All perimeter gas <br /> monitoring probes at the above listed site will be inspected twice a year. The probes will be inspected for <br /> physical condition(labeling, moisture from the probe,well integrity, etc.), gas levels and negative <br /> pressure. A GEMtin 2 NAV gas analyzer will be used for the gas readings. A magnehelic with a maximum <br /> negative pressure of 5 inches of water will be used to measure the negative pressure. A timer will be used <br /> to measure the recovery time after sampling is completed(the time it takes the magnehelic to return to 0 <br /> after sampling ends). <br /> World Enterprises was inspected from 1/19/12-1/20/12. No methane was detected in any of the probes. <br /> None of the wells had a high negative pressure(none exceeded the magnehelic's range of detection). All <br /> of the wells fully recovered after sampling. However many of the wells were surrounded and covered by <br /> thick vegetation which made accessing the wells difficult and uncomfortable. The vegetation needs to be <br /> cleared in order to create an accessible pathway to each well. <br /> Enclosed you will find the perimeter gas monitoring results for the above listed site. This site will be <br /> inspected again later in the year and another letter with the corresponding results will be mailed. <br /> If you have any questions, you may contact Ben Escotto, REHS, at(209)468-3178. <br /> Robert McClellon, REHS <br /> Program Coordinator <br />