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Melissa Nissim [EH] <br />From: Scott Lewis <slewis@lsce.com> <br />Sent: Tuesday, February 27, 2018 4:27 PM <br />To: Melissa Nissim [EH] <br />Subject: Request for Seal Material Variance Permit WP0037962 <br />Attachments: MW Final Design Sketch 2.27.18.pdf <br />Ms. Nissim, <br />LSCE is requesting a variance to the County's requirement of neat cement as an sanitary seal material in the monitoring <br />well to be constructed at the corner of McKinley Road and Vierra Road in Lathrop, CA (SJCEHD Permit WP00037962). <br />LSCE proposes to use 10.3 sack sand/cement grout instead of the neat cement. The reason for the request is due to neat <br />cements tendency to intrude into gravel pack past intermediate sealing materials. This is exacerbated by the depth of <br />the seal. Placing the sanitary seal opposite a dense clay and screen opposite the targeted aquifer formation resulted in a <br />short gravel interval above the upper screen, which causes us concern with regard to the use of neat cement. We have <br />successfully installed hundreds of monitoring wells with 10.3 sack grout and are confident that is an appropriate sealing <br />material for this application. <br />The contractor is currently reaming the test hole in preparation of monitoring well construction. Seal placement is <br />expected to take place either Thursday or Friday of this week. The Contractor will call and schedule the seal date and <br />time. <br />If you have any questions or require further information, please do not hesitate to contact me. <br />Thank You <br />Scott Lewis <br />Scott Lewis, P.G. <br />Principal Geologist <br />500 First Street <br />Woodland, CA 95695 <br />530.661.0109 Main <br />916.240.0230 Cell <br />slewis(alsce.com <br />http://Isce.com/ <br />©LUHOORFF & SCALMANINI <br />CONSULTING ENGINEERS <br />This electronic message contains inforniation from Luhdorff & Scalmanini, Consulting Engineers, which is confidential or privileged. The information is intended to be <br />sent to the individual or entity named above. If you are not the intended recipient, be aware that any disclosure, copying or distribution or use of the contents of this <br />information is prohibited. If you have received this electronic transmission in error, please notity us by telephone at 530-661-0109, ext. M. <br />From: Melissa Nissim [EH] [mailto:mnissim@sjcehd.com] <br />Sent: Tuesday, February 27, 2018 3:09 PM <br />To: Scott Lewis <slewis@lsce.com> <br />Subject: RE: Permit WP0037962 <br />