SITE INFORMATION AND CORRESPONDENCE_FILE 2

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t San Joaquin County DIRECTOR Donna Heran,REHS Environmental Health Department ASSISTANT DIRECTOR 600 East Main Street Laurie cotuna,REHS U): r Stockton, California 95202-3029 PROGRAM COORDINATORS +' * Carl Borgman,REHS Website: Www S" ov"ot hd Mike Huggins,REHS,RDI 1 �eMargaretLagorlo,REHS Phone (209)46$-3420 Robert McClellon,REHS Fax: (209)464-0138 Jeff Carruesco,REHS,RDI Kasey Foley,REHS August 19, 2008 Dalwinder Dhoot Kashmir Singh Dhoot 15600 S. Harlan Road 5300 Penny Lane Lathrop, CA 95330 Pleasanton, CA 94588 Subject: Joe's Place Site Cade: 231585 15500 Harlan Road Lathrop, CA The San Joaquin County Environmental Health Department (EHD) has reviewed the letter regarding "SWRCB's Recommendation for Regulatory Case Closure" dated July 3, 2008, prepared by Stratus Environmental, Inc. (your consultant) for the above subject site and provides the following comments. The EHD received the "Preliminary 5-Year Review Summary Report" prepared by the State Water Resources Control Board Cleanup Fund (SiNRCB-CUF) staff on April 29, 2008 and responded to the SWRCB-CUF by electronic mail on May 1, 2008. The EHD response included corrections to the case information on the number, size and contents of underground storage tanks (UST's)that had been removed from the site in 1998, number, size and contents of active UST's at the site and stated that there were also active=above ground storage tanks at the site. The response also pointed out that the groundwater flow at the site was initially predominantly northeast and that it had recently changed to the northwest, that the groundwater Contamination had spread over the entire 3.77 acre Storage Pro property to the north of the site, that water samples from newly installed monitoring wells placed northwest and north of the site had contamination in them, that the newly installed monitoring wells to the northwest could no longer be found, that the plume of contaminated groundwater was undefined to the northwest and vertically and that because of these facts the plume was not considered to be shrinking or immobile: The SWRCB-CUF letter recommends the site be considered for regulatory closure. The EHD does not believe that sufficient data and information has been provided to justify a determination of "no further action is required" (closure) for this site. It must be demonstrated that the contaminant plume is defined, stable and contaminant concentrations are declining. The groundwater flow direction changed from predominantly to the northeast to the northwest. Contaminant concentrations increased in water samples from MW 13AB, began being detected in water samples from MWt03 and have been detected in water samples from MW15A. This demonstrates that the contaminant plume is mobile and undefined.