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Page 3 of 7 <br /> Cc: Mondavi, Annette; Souza, David; Baker, Kevin; Marcus Knutson; dcook@sjgov.org;Ted <br /> Tasiopoulos [EH]; Donna Heran [EH]; Michael Escotto [EH] <br /> Subject: RE: Linden Well Excavation Completion <br /> The preferred method for backfilling the excavation is for County Public works to dump <br /> native soils down the shaft with the Cat 325 excavator. The shaft includes the 5'x5'timber <br /> shored bottom section,the 10' diameter rind steel and lagged middle section, and the 11' <br /> diameter top section. The dirt backfill would be placed after the drill holes and bottom 5 <br /> feet of the shaft are backfilled with the 10 sack sand slurry recommended by Environmental <br /> Health. <br /> Should Environmental Health require compaction of the shaft backfill, Drill Tech's services <br /> would be required to either, 1) use crane and weight to compact, or 2) provide ventilation, <br /> safety personnel and compaction equipment to compact soils within the shaft. Either of the <br /> options will cost the county money and will be of dubious benefit because the top 12 or so <br /> feet of the site will be backfilled with the County's conventional earthmoving equipment. <br /> Brett K. Mainer, P.E., G.E. <br /> Engineering Manager <br /> Drill Tech Drilling & Shoring, Inc. <br /> 2200 Wymore Way <br /> Antioch, CA 94509 <br /> ph (925) 978-2060 <br /> fax (925) 978-2063 <br /> From: Steven Shih [EH] [mailto:sshih@sjcehd.com] <br /> Sent: Tuesday, February 19, 2013 8:58 AM <br /> To: Bassett, Chanda; Rodney Estrada [EH] <br /> Cc: Mondavi, Annette; Souza, David; Baker, Kevin; Marcus Knutson; dcook@sjgov.org; Ted <br /> Tasiopoulos [EH]; Donna Heran [EH]; Michael Escotto [EH]; Brett Mainer <br /> Subject: RE: Linden Well Excavation Completion <br /> Brett: <br /> Are you proposing to use the excavator bucket full of dirt falling dozens of feet on both <br /> reduced shaft and larger shaft? <br /> Thanks, <br /> Steven C. Shih <br /> Lead Senior R.E.H.S. <br /> San Joaquin County <br /> Environmental Health Department <br /> (209)468-9850 <br /> From: Bassett, Chanda rmailto:CBassett@sioov.org] <br /> Sent: Friday, February 15, 2013 5:09 PM <br /> To: Rodney Estrada [EH]; Steven Shih [EH] <br /> Cc: Mondavi, Annette; Souza, David; Baker, Kevin; Marcus Knutson; <br /> dcook@sioov.orc; Ted Tasiopoulos [EH]; Donna Heran [EH]; Michael Escotto [EH]; <br /> Brett Mainer <br /> Subject: RE: Linden Well Excavation Completion <br /> Rodney or Steve, <br /> Please respond to which option of compaction (listed below) you are requiring for this <br /> 2/22/2013 <br />