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_ 550 Charter Way Page 1 of 3 <br /> Vicki McCartney [EH] <br /> From: Murphy, Mike [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 casing to seal <br /> off shallower zones. This was primarily a concern for the onsite borings where elevated CDCs have been <br /> detected in various zones. Based on utilities, access issues with the Market site, etc. we intend to use a limited <br /> access rig. The drillers have said that they cannot do conductor casings with this type of rig. Since offsite <br /> shallow groundwater in the vicinity of S-10 is generally clean, we are not concerned with shallow groundwater <br /> mixing with deeper groundwater during drilling of well S-15-50. Therefore, no conductor,casing is needed. Grab <br /> groundwater data for CPT-17 (west of well S-15-77)shows that the 50 foot zone is not impacted. This again <br /> suggests that conductor casing is not needed. However,if we wanted to 100% safe,we should install S-15-50 <br /> and sample before installing S-15-77. If clean, that confirms no need for conductor casings. I just wanted you to <br /> 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 /> MRMurphyO 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 /> I did not have this information so I thank you for letting me know the drilling schedule associated with the Shell <br /> station at 620 Charter Way, Stockton. I don't understand.what you meant when you wrote -As well S-10 is <br /> typically ND, we plan on using hollow-stem augers. Please clarify. <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 /> 1/10/2008 <br />