Laserfiche WebLink
550 Charter Way Page 2 of 5 <br /> Mike: <br /> I assume S-10 is MW-10 and S-11 is MW-11. <br /> When do you pian to install the two monitoring wells MW-15-50 and MW-15-50? <br /> Vicki McCartney,Senior REHS <br /> San Joaquin County ° <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Phone: (209)468-9852 <br /> Fax: (209)468-3433 <br /> E-mail: vmccartney@sjcehd.com <br /> From: Murphy, Mike [mailto:mrmurphy@craworld.com] <br /> Sent: Thursday,January 10, 2008 12:51 PM <br /> To: Vicki McCartney [EH] <br /> Subject: RE: 550 Charter Way <br /> We originally intended to use the rotosonic rig for all wells except S-11. The roto rig uses an outer <br /> casing to seal off shallower zones. This was primarily a concern for the onsite borings where <br /> elevated COCs have been detected in various zones. Based on utilities, access issues with the <br /> Market site, etc. we intend to use a limited access rig. The drillers have said that they cannot do <br /> conductor casings with this type of rig. Since offsite shallow groundwater in the vicinity of SAO is <br /> generally clean, we are not concerned with shallow groundwater mixing with deeper groundwater <br /> during drilling of well S-15-50. Therefore, no conductor casing is needed. Grab groundwater data <br /> for CPT-17 (west of well S-15-77) shows that the 50 foot zone is not impacted. This again suggests <br /> that conductor casing is not needed. However, if we wanted to 100% safe, we should install S-15- <br /> 50 and sample before installing S-15-77. If clean, that confirms no need for conductor casings. 1 <br /> just wanted you to now our plan. Let me know your thoughts and how you think we should proceed <br /> Thanks <br /> Mike Murphy <br /> Conestoga-Rovers &Associates (CRA) <br /> 19449 Riverside Drive, Suite 230 <br /> Sonoma, CA 95476 <br /> P. (707)933-2367 <br /> F. (707)935-6649 <br /> C. (510)385-3116 <br /> MRMurp y@craworld.com <br /> Conestoga-Rovers and Associates has acquired the former Cambria Environmental Technology <br /> Visit us at www.craworld.com <br /> From: Vicki McCartney [EH] [mailto:vmccartney@sjcehd.com] <br /> Sent: Thursday,January 10, 2008 11:11 AM <br /> To: Murphy, Mike <br /> Subject: RE: 550 Charter Way <br /> Mike: <br /> 1/10/2008 <br />