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Page 2 of 3 <br />` potential). <br /> ` I recommend stalling our response to Feb 16, 2012. <br /> Then it won't be my problem... <br /> From: Adrienne Ellsaesser [EH] <br /> Sent: Tuesday, January 17, 2012 2:30 PM <br /> 4 To: Mike Infurna [EH]; Nuel Henderson [EH] <br /> Subject: FW: Beacon # 3641, 1210 E. Hammer.Lane, Stockton LOP Case 1125 - Waiver of over <br /> sensitive well destructions <br /> His logs to not indicate an annular seal was installed around the conductor casing or if and annular seal <br /> was installed between the conductor casing and MW/VW PVC casings. Do you have this information? If <br /> so, I'd like to know the depth of each seal and sealant used. <br /> Thanks <br /> Adrienne <br /> y <br /> From: Rex Smith [mailto:rsmith@horizonenvironmental.net] <br /> Sent: Monday, January 16, 2012 2:56 PM <br /> To: Nuel Henderson} [EH]; Adrienne Ellsaesser [EH] <br /> Cc; Mike Infurna [EH] <br /> r Subject: FW:"Beacon # 3641, 1210 E. hammer Lane, Stockton LOP Case 1125 - Waiver of over-drilling <br /> sensitive well destructions <br /> FYI <br /> e Rexford Smith, PG 5307 <br /> HORIZON ENVIRONMENTAL INC. <br /> 4970 Windplay Drive,.Suite 5 <br /> EI Dorado Hills, CA 95762 <br /> f <br /> TeL (916) 939-2170 <br /> i Fax: (916) 939-2172 <br /> Website: www.horizonenvironmentalinc.com <br /> 1 <br /> z <br /> 51 <br /> 3 . <br /> From: Emil Kruck <br /> Sent: Monday, January 16, 2012 12:19 PM <br /> To: Rex Smith <br /> Subject: Beacon # 3641, 1210 E. Hammer Lane, Stockton LOP Case 1125 - Waiver of over-drilling <br />} sensitive well destructions <br /> Mr. Infurna: <br /> Upon closer review of the boring logs and field reconnaissance of the groundwater and remediation wells <br /> approved for destruction by the San Joaquin County EHD, it has become evident to Horizon that over- <br /> drilling of several of these installations within the existing UST basin,''may potentially present a safety risk <br /> of disturbing the integrity of the fuel storage system. Currently, triple completion MW-11VW-112; double <br /> completions VW-314, VW-516, VW-718, single monitoring well MW-5 and sparge well SW-1 are all located <br /> within.the boundaries of the UST and are constructed within either 16 and 18-inch diameter permanent <br /> PVC conductor casings. Any accidental contact of the drilling augers with the walls of the casings during <br /> over-drilling process may result in twisting, slipping, or sliding of the casing which could trigger <br /> subsidence of the pea-gravel backfill and affect stability of the fuel system Destructing the groundwater <br /> : monitoring and remediation wells by internal exploding would also be out of consideration given.the <br /> 'F <br /> i <br /> 1/23/2012 <br />