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0 • <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 /> Fax (209)468-0341 <br /> ael Isoesser@s jcehd.com <br /> From: Waite, Brian A rmailto:BWaite@chevron.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 <br /> denial for the above referenced project. As discussed, Chevron is <br /> working with Tylor McMillan of Welenco on an experimental well <br /> destruction methodology utilizing blast perforation to determine a safe <br /> distance away from our tanks at active service station sites. In order to <br /> model a safe distance away from the USTs during blast perforation, we <br /> are looking to over-drill two soil vapor probe locations (SVP-3B and SVP- <br /> 46) to the total depth and then back-fill these two boreholes to 10' bgs <br /> with a clean cement. Upon hardening of the clean cement, Geophones <br /> will be placed in these two boreholes to simulate the bottom of the <br /> tanks. A seismograph will be attached to each of the Geophones to <br /> monitor peak particle velocity at these locations during the detonation of <br /> surrounding wells. <br /> As discussed, Chevron will work with Tylor to ensure that detonation <br /> cord is strung from the bottom of the hole up to within a clay <br /> lens/bentonite seal to ensure that there is no pathway for the downward <br /> migration of contaminants. To ensure that we are properly evaluating a <br /> safe distance away from our UST's when utilizing blast perforation, <br /> Chevron respectfully requests permission to abandon all%"or greater <br /> casing diameter wells utilizing the blast perforation process. <br /> Attached you will find a copy of Table 1 —Soil Boring and Well <br /> Construction Details that outlines which wells we would like to detonate. <br /> Thank you, <br /> Brian A. Waite, P.G. <br /> Project Manager <br /> Chevron Environmental Management Company <br /> Marketing Business Unit <br /> 6101 Bollinger Canyon Road <br /> San Ramon, CA 94583 <br /> Tel 925-790-6486 <br /> bwaite@chevron.com <br /> 4 <br />