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Page 4 of 7 <br /> backfill. <br /> Thank you, <br /> Chanda <br /> From: Brett Mainer [mailto:Brettaadrilltechdrillina com] <br /> Sent: Fri 2/15/2013 5:01 PM <br /> To: Rodney Estrada [EH]; Bassett, Chanda; Steven Shih [EH] <br /> Cc: Mondavi, Annette; Souza, David; Baker, Kevin; Marcus Knutson; <br /> dcook@sioov.oro; Ted Tasiopoulos [EH]; Donna Heran [EH]; Michael Escotto [EH] <br /> Subject: RE: Linden Well Excavation Completion <br /> We agree with recommended items 1 and 4, as well as abandoning the shoring in <br /> place. Unfortunately, it is impossible to properly compact 5' lifts with construction <br /> equipment. Even the largest compactors (think dam construction projects) can only <br /> achieve compaction on 2 to 3 foot lifts. Hand equipment is good for 6"to 8" lifts. I <br /> believe that the impact of excavator bucket fulls of dirt falling dozens of feet will <br /> provide suitable compaction for the intended purpose and that additional compactive <br /> effort is not worth the money. <br /> However, if the County thinks it prudent to spend for additional compaction effort, <br /> we can use the crane to tamp the earth with a large flat bottomed wrecking ball that <br /> we have. I would suggest placing the weight after every other bucket of earth is <br /> dropped from the County's 325 excavator. This will provide a moderate level of <br /> compaction (not suitable for home construction above, but fine for grazing land). <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: Rodney Estrada [EH] fmailto:restradaasicehd.com] <br /> Sent: Friday, February 15, 2013 4:34 PM <br /> To: Bassett, Chanda; Steven Shih [EH] <br /> Cc: Mondavi, Annette; Souza, David; Baker, Kevin; Marcus Knutson; <br /> dcook(c sioov.oro; Brett Mainer; Ted Tasiopoulos [EH]; Donna Heran [EH]; Michael <br /> Escotto [EH] <br /> Subject: RE: Linden Well Excavation Completion <br /> Hello Chanda, <br /> EHD staff have reviewed the construction of the well/excavation with consideration <br /> to the protection of groundwater, and have determined the following destruction <br /> requirements: <br /> 1. The two 6 inch borings shall be grouted with 10.3 sack sand/cement mix <br /> from the bottom of the open portion of the borings up to the smaller(5' by <br /> 5') reduced shaft. A cement cap shall be extended 5 feet into the reduced <br /> shaft. <br /> 2. The reduced shaft shall then be backfilled with clean native soil in 5 foot <br /> 2/22/2013 <br />