Laserfiche WebLink
I am agreeable to allow the MW destructions using explosives as specified <br /> below and as identified within the attachment, provided (as you note) the <br /> length of the explosive string begins within a clay lens above the filter <br /> pack's bentonite seal. Many of the wells are constructed with the bentonite <br /> seal in other types of formation material,such as silt. We recommend <br /> referring to the boring logs to set the upper limit of the string. <br /> Please provide me with the length of the explosive string proposed and the <br /> depth of the upper end of the string for each well, based on the boring log <br /> contained in the January 2, 2013 Closure Report that demonstrates the <br /> explosive string to be beginning within the targeted clay lens. We require <br /> this information so we may verify proper destruction of the well during the <br /> destruction inspection. <br /> Thanks <br /> Adrienne <br /> Adrienne Ellsaesser, REHS <br /> Unit IV Program Coordinator <br /> Groundwater Protection Programs: <br /> Site Mitigation/LOP/Small Public Water Systems <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton ,CA 95205 <br /> Ph (209)468-0343 <br /> Fox (209)468-0341 <br /> aellsoesser@sacehd.com <br /> From: Waite, Brian A [mailto:BWaiteCalchevron.com] <br /> Sent: Wednesday, August 20, 2014 10:34 AM <br /> To: Adrienne Ellsaesser [EH] <br /> Cc: Nuel Henderson [EH]; Gabriel Gonzalez [EH] <br /> Subject: 437 East Miner Ave. <br /> Adrienne, <br /> Thank you for taking the time this morning to discuss the work plan denial for the above <br /> referenced project. As discussed, Chevron is working with Tylor McMillan of Welenco on <br /> an experimental well destruction methodology utilizing blast perforation to determine a <br /> safe distance away from our tanks at active service station sites. In order to model a safe <br /> distance away from the USTs during blast perforation, we are looking to over-drill two soil <br /> vapor probe locations(SVP-3B and SVP-4B)to the total depth and then back-fill these <br /> two boreholes to 10' bgs with a clean cement. Upon hardening of the clean cement, <br /> Geophones will be placed in these two boreholes to simulate the bottom of the tanks. A <br /> seismograph will be attached to each of the Geophones to monitor peak particle velocity <br /> at these locations during the detonation of surrounding wells. <br /> 2 <br />