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Page 1 of 3 <br /> Nuel Henderson [EH] - <br /> From: Rex Smith [rsmith@horizonenvironmental.net] <br /> Sent: Thursday, January 03, 2013 1:21 PM <br /> To: Lisa Medina [EH]; Nuel Henderson [EH]; Adrienne Ellsaesser[EH] <br /> Cc: Sexton, Tom; Gary Barker <br /> Subject: RE: Status Well Destruction - 1210 E Hammer Ln, Stockton, CA <br /> Attachments: Fig 2 UST Closure Rpt Aug96 9.pdf <br /> Hello, Lisa, Now that right-of-entry agreements appear to be coming together, the subject well <br /> destructions project can move forward. <br /> Horizon will submit the work plan with the permit applications. <br /> Regarding the 216112 letter, Horizon acknowledges: that EHD conditionally approves of pressure grouting <br /> wells MW-11VW-112, VW-314, VW-516, VW-718, SWA and MW-5 located in the current UST basin; that <br /> logs for wells MW-5,VW-516,VW-718 and SW-1 do not accurately represent well construction; the well ID <br /> notes orr the photo are incorrect in places; and that EHD requests demonstration of intersection of bore <br /> hole and backfill for wells MW-11VW-112 and VW-314. <br /> For MW-5, VW-516, VW-718 and SWA well logs, the lines representing the conductor casings should be <br /> at the left and right edges of the Well Construction column; backfill outside of conductor casing and neat <br /> cement inside conductor casing and around well casing. The backfill outside of the conductor casing <br /> would not show in the Well Construction column. <br /> MWANW-112 and VW-314 well logs do accurately represent well construction. The conductor casing lines <br /> are at the edge of the Well Construction column. The adjacent Graphic Representation column does not <br /> depict well construction information. The logs indicate that backfill extends deeper than the conductor <br /> casing (10 feet). Also, the attached Figure 2 from the August 1996 UST Closure Report indicates that the <br /> UST excavation was 14 feet deep in the area of wells MW 11VW-112 and VW-314.Therefore, the backfill <br /> intersects the bore hole below the conductor casing and EHD would approve pressure grouting of these <br /> wells. <br /> Per the 1219111 EHD/lnfurna letter, wells which were found in their last sampling event to contain NO <br /> analyte detections and are outside the area of residual contamination may be destroyed by pressure <br /> grouting. Horizon considers all other wells than those discussed above to be outside the area of residual <br /> contamination. With the exception of MWA 0, all other wells(besides those discussed above)were found <br /> to have no analyte detections in their last sampling event on 6130111. Well MW-10 had 0.96 ppb MTBE <br /> (reporting limit is 0.50 ppb); no other analytes were detected. Horizon requests EHD consideration for <br /> pressure grouting MW-10 in light of the sole, near-reporting limit MTBE concentration. If this is not <br /> acceptable, Horizon will plan to drill out MW-10. <br /> Horizon will submit the work plan and permit application soon after receiving all the necessary <br /> documentation. <br /> Thank you for your consideration. <br /> Rexford Smith, PG 5307 <br /> HORIZON ENVIRONMENTAL INC. <br /> 4970 Windplay Drive, Suite 5 <br /> EI Dorado Hills, CA 95762 <br /> Tel: (916) 939-2170 <br /> Fax: (916) 939-2172 <br /> Website: www.horizonenvironmentalinc.com <br /> From: Lisa Medina [EH] [mailto:lmedina@sjcehd.com] <br /> Sent: Wednesday, January 02, 2013 2:10 PM <br /> To: Sexton,Tom <br /> 1/25/2013 <br />