Laserfiche WebLink
wr' � <br /> Mr. George Luxbacher - 3 - 6 August 2012 <br /> 3. Given that the groundwater model that GSH presented to us in October 2011 was <br /> developed prior to performing the pumping test on EW-09, there should have been a - <br /> comparison made from the collected hydraulic testing data from EW-09 and surrounding <br /> wells to determine if the wells responded according to the predictions made by the <br /> groundwater model. This type of comparison could confirm the accuracy of the model or <br /> require that changes be made to the model. The Report did not include a discussion of <br /> this comparison. Please provide this discussion in the addendum report so that we can <br /> be assured that the model appropriately represents the site's specific hydrogeologic <br /> pumping conditions. <br /> 4. Based on the omission of supporting information in the Report, the Central Valley Water <br /> Board staff cannot properly evaluate the recommendation of converting existing <br /> extraction wells EW-03 and EW-04 as injection wells. Once the well test data and <br /> analysis is provided as requested above, staff will be able determine whether these wells <br /> may be considered to be used for additional injection wells. <br /> 5. Due to the recent discovery of elevated sulfolane in J.R. Simplot's backup supply well <br /> (BSW), which is located less than 100 feet east of proposed injection well INJ-12, <br /> please provide in the addendum report a discussion of the potential water quality effect <br /> on the BSW by injecting treated water into proposed INJ-12. Also, include an evaluation <br /> of the potential effect that the INJ-12 injections may have on the sulfolane impacted <br /> groundwater in the vicinity of the BSW (i.e. potential to spread the sulfolane plume <br /> vertically and laterally). <br /> In summary, the Central Valley Water Board concurs with the concept of the proposed work- <br /> however, since the Report does not provide any discussion, rationale or conclusions based on <br /> the hydraulic testing data from EW-09 for the proposed well network design, we cannot <br /> properly evaluate the proposed scope of work. Therefore, GHS needs to address comments <br /> 1 — 5 in an addendum report and submit it to us by 14 September 2012. <br /> If you have questions or comments, please contact me at 916-464-4658, or by e-mail at <br /> ssewalia(a),waterboards.ca.gov <br /> Siddharth Sewalia <br /> Water Resource Control Engineer <br /> Private Sites Cleanup Unit <br /> cc: Mr. John L. Yanak, J.R. Simplot Company, Lathrop <br /> Ms. Liz Sewell, ARCADIS Inc., Roseville <br /> Mr: Alan L. Prouty, J.R. Simplot Company, Boise, ID <br /> Mr. Ryan Mock, J.R Simplot Company, Lathrop <br /> Mr. Garrett Backus, San Joaquin County Environmental Management Department, <br /> Stockton <br /> KAa_ E. LoNGLEY SGD, P.E., CHAIR { PAM"A C. CREE40N P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive 0200, Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvailey <br /> CJ RECVCIFn PAPER <br />