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.k Page 2 of 2 <br /> IF/WHEN it takes more than ONE hour (equal to $122) to destroy a well. So plan on a good, <br /> quick crew to do the job. with less upfront money sen in, it's very possible delays on the <br /> job/greater than ONE hour per well will add up and you'll get a bill for the amount over the <br /> submittal amounts. there are two drillers out there wi h a coring device that will provide the <br /> pressure grout "mushroom cap" our Ordinance requir as. this method saves time—which saves <br /> you money. <br /> remember, nested wells put in with, say a 10" auger, ill NOT be adequately over-bored with a <br /> 10" auger. why? to overdrill you have to set the center rod/stinger on the deep casing...it <br /> WON'T be in the center of the borehole. so to reach Dut past the center point and reach the <br /> outside of the sand/bentonite/grout of the other casing, you must use a larger auger. I've done <br /> the math, you'll need a 14"115" HSA.. a 12" won't reach...nightmare to drill 15's very <br /> deep....lots of I DW. <br /> be sure to anticipate this need in your destruction proposal. <br /> also, for pressure grouting, plan on thinnest legal nee t cement (94 lbs Portland to 10 gallons <br /> potable water) injected down casing and held at LIQUID pressure (not air) of 25 psi for 10 <br /> minutes with no drop in level. Then there's the MUSF ROOM CAP..... Each pressure grouted <br /> casing is then to be excavated to 3 feet bgs with a b re/auger diameter of 12 inches LARGER <br /> than the original (installed) borehole to 2.5'bgs where the PVC is to be cut off. As an example, <br /> if the well was installed with a 10" HSA, you'll need a 22" hole. this is where that coring device <br /> shines. Grout is to be added to the casing and allowed to overflow into this hole and come up <br /> 12inches above the cut off PVC casing..(18inches bg ). hole to be filled to match <br /> existing/surrounding area. IT's right out of our Coun Ordinance.(Section 13.17.12 & <br /> 13.12.13, SJ County Well Standards, attached above- see last page ). <br /> here's the webpage for the forms you'll need. click arid print each. <br /> http-//www.sjgov.org/ehd/Pr-o.arams/Environmental-./-... rings.h_tm <br /> after all the wells are destroyed properly, you'll need to send me a report that details the <br /> procedures, dates, and concerns with the well destructions. This report must include tracking <br /> records for the IDW (investigational derived waste) si ned by the facility receiving the waste <br /> before I can issue the official No Further Action letter closing the site on Geotracker. <br /> good luck.. <br /> mike <br /> 5/16/2411 <br />