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RE: World Enterprises Passive . '1 Vent Plan Page 1 of 3 Natalia Subbotnikova [EH] From: Young, Glenn [GYoung@CIWMB.ca.gov] Sent: Tuesday, July 03, 2007 6:45 PM To: Robert McClellon [EH]; Jay_Kamine@URSCorp.com Cc: jmacans@ciwmb.ca.gov; Natalia Subbotnikova [EH] Subject: RE: World Enterprises Passive Soil Vent Plan Based on the below, I would recommend monthly monitoring for a minimum of one year. At the end of the year submit a plot of gas concentrations versus time graph to establish time periods when gas may exceed regulatory thresholds. This data can be used to justify monitoring frequency reductions (or status quo). If the site is exceeding the 5% rule during any monitoring event--gas control may be required by the LEA to prevent perimeter migration or migration to structures. At this site--since residential structures are within 1000 feet--I would recommend a frequency that is conservative. Glenn From: Robert McClellon [EH] [mailto:RMcClellon@sjcehd.com] Sent: Mon 10/16/2006 11:30 AM To: Jay_Kamine@URSCorp.com Cc: jmacans@ciwmb.ca.gov; Natalia Subbotnikova [EH]; Young, Glenn Subject: RE: World Enterprises Passive Soil Vent Plan Jay,at this time I would say that the bi-weekly inspection need to occur at least for a month regardless of concentrations.At that time the EHD may consider your request to reduce the number of inspections.In conversation with you,you stated that testing conducted at another site indicated that the passive trench would release more gas under atmospheric low pressure. Seeing as that changes with the weather,I think it is too soon to just walk away.I have not seen a written plan for monitoring from you as we discussed earlier.I have not heard anything from you regarding the UGT that was found at the site. I would suggest that you get something to me very soon.Robert Robert McClellon,Program Coordinator REHS San Joaquin County Environmental Health Department 304 E. Weber Ave Third Floor Stockton,CA 95202 (209)468-0332 -----Original Message----- From: Jay_Kamine@URSCorp.com [mailto:Jay__Kamine(a7URSCorp.com] Sent:Monday,October 16,2006 8:55 AM To: Robert McClellon [EH] Subject: RE: World Enterprises Passive Soil Vent Plan Robert: During the previous monitoring event(on June 29,2006),the methane concentration in only five of the probes(VW-4 [12.0%],VW-5S [12.5%], VW-51) [5.9%],VW-6S [13.1%],and VW-6D [5.4%])was greater than 5 percent. During this past monitoring event(on September 29,2006),none of the probes was found to have a methane concentration greater than 5 percent. 7/5/2007