Laserfiche WebLink
Page 1 of <br /> Mike Infurna [EH ] <br /> From : Wall , BJ [BJ .Wall@arcadis-us.com] <br /> Sent: Saturday, December 06 , 2008 6 :08 PM <br /> To : Mike Infurna [EH] <br /> Cc: Myers, Tonya; Wynne, Katie; Feucht, Drew; Hopp, Josh ; tjaramillo@cascadedrilling .com; Paul <br /> snelgrove <br /> Subject: Chevron 94054 (2103 Country Club Boulevard, Stockton) Monitoring Well Borings Over the <br /> Weekend <br /> Attachments: 94054 Secured Borehole for Weekend 12062008.pdf <br /> Hello Mike, <br /> Please confirm that the following method of securing offsite monitoring well locations prior to leaving the site for <br /> the weekend is acceptable. <br /> Monitoring well locations will be secured to as not provide a conduit for surface water to reach deep groundwater: <br /> • All conductor casing must be cut sufficiently below grade to allow for a flush , or slightly positive relief to <br /> avoiding pooling , asphalt or concrete finish to surface <br /> j • Hydrated bentonite chips must be placed at the bottom of the borehole; both inside the conductor casing <br /> and in the annular space between the conductor casing and edge of borehole <br /> • Grout will be placed in the annular space between the conductor casing and the edge of the borehole, on <br /> top of the hydrated bentonite layer <br /> • A wood plug will be placed at the upper opening of the conductor casing <br /> • Sand will be place on top of the grout to make a near level surface with the top of the wood plug <br /> • Visqueen/plastic sheeting will be place on top of the sand and wood plug to provide a secondary guard <br /> against water entering the conductor casing <br /> • Cold patch asphalt or concrete will be place above the visqueen/plastic sheeting and finished with a <br /> slightly positive relief to surface <br /> If conditions change, Mike Infurna or authorized member of SJCEHD will be contacted and an acceptable solution <br /> will be agreed upon. This solution is never to include leaving a potential for the conductor casing to act as a <br /> i conduit or provide a tripping hazard . <br /> i <br /> cross section afAhe-proposed securing-procedures is attached, <br /> If necessary a steel plate may be placed on top of the construction discussed above and cold patch asphalt will <br /> be place around the rim of the plate to prevent tripping . This method may be used if the compression strength of <br /> the above construction is deemed too little to provide a safe driving surface for motorists . <br /> Thank you , <br />; i B.J . <br /> B.J . Wall, EIT <br /> Environmental Engineering Specialist <br /> ARCADIS <br /> 950 Glenn Drive <br /> Suite 125 <br /> r Folsom , CA 95630 <br /> ij T 916 .985.2079 ext. 20 <br /> C 916.225. 1168 <br /> F 916 .985.2093 <br /> i E-mail : bj .wall@arcadis-us .com <br /> Ar Please Consider the enviromnent before printing this emaihf <br />