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hl Italia Subbotnikova [EH] <br />From: <br />Robert McClellon [EH] <br />Sent: <br />Tuesday, September 05, 2006 2:41 PM <br />To: <br />Natalia Subbotnikova [EH] <br />Subject: <br />FW: Passive Soil Vent Plan <br />This is Jays response. <br />-----Original Message ----- <br />From: Jay_Kamine@URSCorp.com [mailto:Jay_Kamine@URSCorp.com] <br />Sent: Friday, September 01, 2006 1:57 PM <br />To: Robert McClellon [EH] <br />Cc: Judy McCampbell <br />Subject: RE: Passive Soil Vent Plan <br />Robert: <br />Thank you for your review comments on our work plan to install the passive <br />soil vapor extraction trench at the World Enterprises site in Stockton, <br />California in the e-mail message below. The responses to your comments <br />below were developed based on our discussion on August 29, 2006 and August <br />31, 2006 and are as follows: <br />1. The vent pipes will be constructed such that the end of each vent pipe <br />will be installed at least 10 feet above the ground surface. <br />2. The top of the vent pipe will either be constructed with slotted or <br />drilled piping with an end plug. <br />3. A site health and safety plan is being developed and after it has been <br />completed, it will be transmitted to you prior to the construction <br />activities. <br />4. I understand that the basis for this comment is to prevent any type of <br />vehicular traffic over the passive soil vapor extraction trench after its <br />installation to minimize the potential for settlement caused by vehicles <br />where this settlement may decrease the effectiveness of the passive soil <br />vapor extraction trench. The overall objective of this project is to <br />prevent methane from migrating offsite. To achieve this objective, the <br />soil above the trench will be compacted to minimize migration of methane <br />through this soil so that methane will migrate towards the passive soil <br />vapor extraction trench. As soil compaction increases, pore space <br />decreases. As pore space decreases, methane migration decreases as well as <br />the potential for settlement decreases. Hence, we feel that vehicular <br />traffic over the trench will not likely cause a decrease the effectiveness <br />of the passive soil vapor extraction trench. Since you have this concern, <br />the trench location will be marked as you suggested with a rope or another <br />method (as approved by you) to prevent any type of traffic over the trench <br />after its installation. We recognize that the vent pipes will need to be <br />protected from vehicles and we plan to install either bollards around each <br />vent pipe. <br />5. The site will be posted with the contact information following the <br />completion of the construction activities. <br />If I have misunderstood the information provided in our discussion you have <br />any questions, please let me know. I can be reached either through e-mail <br />message or by calling me at (916) 679-2081. <br />Take care, <br />Jay <br />