SITE INFORMATION AND CORRESPONDENCE_FILE 2

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San Joaquin County DIRECTOR u Donna Heran,REHS o . � Environmental Health Department ASSISTANT DIRECTOR z ` 'Z 600 East Main Street Laurie Cotulla,REHS Stockton, California 95202-3029 PROGRAM COORDINATORS •. :`' Carl Borgman,REHS. Website: www.S/ ov.or /ehd Mike Huggins,REHS,RDI. C' ,P QCrj'�c� Margaret Lagorio,REHS Phone: (209)468-3420 Robert McClellon,REHS. Fax: (209)<464-0'138 Jeff Carruesco,REHS; RDI Kasey Foley,REHS December 4, 2008 Dalwinder Dhoot. Kashmir Singh Dhoot. 15600 S. Harlan Road 5300 Penny Lane Lathrop, CA 95330 Pleasanton, CA 94588 Subject Joe's Place Site Code: 231585 15600 Harlan;Road Lathrop, CA. The San.Joaquin County Environmental Health Department (EHD) has reviewed the "Quarterly Groundwater Monitoring Report, Third Quarter 2008 (Report) dated October 28, 2008, prepared by Stratus Environmental, Inc. (Stratus) for the above subject site and provides the following comments. The Report discusses that off-site monitoring wells MW-13A/B and MW-13C were located on August 12, 2008, and were sampled on September 25, 2008. MTBE was detected in the water sample from monitoring well MW-13A/Bat 130 micrograms per liter (ug/1). The concentrations of MTBE in the water samples from this well have increased since the well was first sampled in March 2007. The concentration of MTBE in the water sample from on-site monitoring well MWO-1X was also 130 ug/I and the samples from that well have been 100 ug/I or higher since December 2007. Although, the current concentrations of MTBE in the water samples from MWO-1X are lower than the concentrations found in the water samples when it was installed in February 2002 (570 ug/1), allowing the contamination to continue to migrate off-site is not acceptable. On August 2, 2007, Jim Barton from the Central Valley Regional Water Quality Control Board and.Margaret Lagorio from the EHD met with Sarah Salcedo and Gowri Kowtha from Stratus. At the meeting it was discussed that remediation by natural attenuation was probably not viable and that groundwater extraction and treatment may be the most viable option for the site. At. the August 2007 meeting it was agreed that Stratus would prepare and submit a Site Conceptual Model for the site as well as a Final Remediation Plan and to date neither of these documents have been submitted to the EHD. If continuous remedial action is not cost effective then evaluation of shorter term remedial actions should be considered. in a Stratus letter dated July 3, 2008, it was proposed that Stratus would submit a wont plan to evaluate soil vapor migration and the EHD approved of this proposal on August 19, 2008, A work plan for a soil vapor investigation has not been submitted to the EHD to date.