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If the existing seal is questionable, not up to code standards, or known to be currently damaged, <br /> Welenco can modify the blast design based upon accurate information provided to us. . However this <br /> does come with a elevated hazard risk and proper planning of a containment method for over <br /> pressure must be implemented. <br /> i <br /> Welenco does not, under any circumstance, bring a charge within the upper 20 feet of a well that has <br /> any structure or underground utilities within 100 feet due to seismic activity that can cause damage <br /> to these structures. <br /> If there are any questions or concerns about or methods of well destruction, feel free to contact me <br /> at any time. I would be happy to discuss the options available. <br /> Thank you, <br /> Tylor McMillan <br /> WWTI / Welenco <br /> Project Manager / Blaster <br /> (916) 761-5224 <br /> From: "Sobieraj, Justin" <Justin.Sobierai(cDarcadis-us.com> <br /> To: "mcmillans521(nyahoo.com" <mcmillans521CcDyahoo.com> <br /> Sent: Monday, October 7_20113 10:06 AM <br /> Subject: FW: 3978 S Hwy 99 Stockton, CA-Status remaining well destructions(309075) <br /> From:Nuel Henderson[EH] [mailto:nhenderson@sjcehd.com] <br /> Sent: Thursday,October 03,2013 1:07 PM <br /> To: Sobieraj,Justin;Lisa Medina[EH] <br /> Cc:Nickens,Amber;BWaite@chevron.com;Adrienne Ellsaesser[EH] <br /> Subject:RE: 3978 S Hwy.99 Stockton, CA- Status remaining well destructions(309075) <br /> i <br /> Justine,the entire well must be destroyed by blasting or removal of contents.What you are proposing is essentially a modified <br /> pressure grouting,which is not acceptable for wells with contamination. <br /> Nuel <br /> From: Sobieraj,Justin[mailto:Justin.Sobierai@atcadis-us.com] <br /> Sent: Thursday,October 03,2013 10:21 AM <br /> To: Lisa Medina[EH] <br /> Cc:Nuel Henderson[EH];Nickens,Amber;Brian A.Waite(BWaite@chevron.com) <br /> Subject:RE: 3978 S Hwy 99 Stockton,CA-Status remaining well destructions(309075) <br /> Lisa- <br /> I spoke with Welenco about the planned detonation method of abandoning MW-1 and MW-4. They <br /> recommended detonating within only the screened interval (MW-1 65'-85' and MW-2 65'-75'). The <br /> remaining casing would be backfilled with clean cement.-Depth to water has been historically measured <br /> at approximately 50 feet bgs at this site. <br /> Is this approach acceptable to SJCEHD? <br /> Thank you, <br /> 2 <br />