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• Page 1 of 3 <br /> Nuel Henderson [EH] <br /> From: Adrienne Ellsaesser[EH] <br /> Sent: Wednesday, June 04, 2014 1:45 PM <br /> To: Nuel Henderson [EH] <br /> Subject: RE: Cordes Ranch Well Destructions-COR-060223-2014- <br /> Goodjob! Thanks <br /> From: Nuel Henderson [EH] <br /> Sent: Wednesday, June 04, 2014 1:43 PM <br /> To: 'Lescure, Daniel' <br /> Cc: Adrienne Ellsaesser [EH]; John Yoakum [EH] <br /> Subject: RE: Cordes Ranch Well Destructions -COR-060223-2014- <br /> Daniel, <br /> COR-060223-2014Daniel, <br /> I have reviewed the information you sent to me in regard to San Joaquin County Well Standards for proper <br /> destruction methods for monitoring wells. As I mentioned during our phone conversation earlier today, the interest <br /> of the Environmental Health Department in applying the standard is not the same as the Central Valley Regional <br /> Water Quality Control Board's interest in the investigation and characterization of the unauthorized release from <br /> the pipeline; the EHD concern is with the proper destruction of wells that may serve as vertical conduits in areas <br /> of known or suspected contamination, whatever the source of the contamination. <br /> The EHD has identified the following wells as requiring removal of the well contents and grouting the resulting <br /> boring for proper destruction under the county Well Standards: <br /> MW-1 Impacted soil from 5 to at least 20 feet below ground surface(bsg); <br /> MW-2 Impacted soil 5 feet to at least 40 feet bsg and impacted groundwater; <br /> MW-4 Impacted soil at 25 feet bsg; <br /> MW-5A Impacted soil from 20 feet to at least 50 feet bsg and the presence of free product; <br /> MW-513 Inferred presence of impacted soil and possibly free product in similar depth intervals as in MW- <br /> 5A and periodically impacted groundwater; <br /> MW-5C Inferred presence of impacted soil and possibly free product in similar depth intervals as in MW- <br /> 5A and periodically impacted groundwater; <br /> MW-13B Periodic impact to groundwater; <br /> MW-13C Periodic impact to groundwater; <br /> MW-15 Impacted soil at 29 feet and 40 feet bsg and presence of free product; <br /> VW-1 Impacted soil; <br /> VW-2 Impacted soil; and <br /> VW-3 Impacted soil. <br /> The steel conductor casings in MW-513 and MW-5C can remain in place, but the upper 3 feet must be removed <br /> and finished in accordance with the Well Standards; all other monitoring wells listed in the work plan can be <br /> pressure grouted as proposed in the work plan. <br /> Thanks again for providing the various documents and information to me. Do contact me if you have any <br /> additional questions or comments. <br /> Nuel Henderson, PG <br /> (209)468=3436 <br /> From: Lescure, Daniel [mailto:DLescure(&craworid.com] <br /> Sent: Tuesday, June 03, 2014 5:08 PM <br /> 7/18/2014 <br />