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Page 1 of 2 Lori Duncan [EH] From: Lori Duncan [EH] Sent: Wednesday, June 09, 2010 12:17 PM To: 'Hari Patel' Subject: RE: Claim No 8525, Your Case No. 2021 Hari, OK, I think I found the site, I presume you are talking about 15634 Steinegul Road, the Former Greer Construction site? Is this correct? This site is a residence, people live there, the onsite domestic well is used every day. A main contaminant of concern at this site is 1,2-dichloroethane in monitoring well MW-6 (current concentration 190 ppb), which is a deep well, screened discretely at 95-100 feet below surface grade (bsg). In addition to 1,2- DCA this well continues to have high concentrations of TPH, benzene and MtBE. The onsite domestic well is screened from 195-215 feet bsg, but is gravel packed from 50-215 feet bsg; there is only a 50-foot grout seal. Except for a couple of detections of ethylbenzene and xylene in the past, the onsite well has not been impacted by the petroleum plume. A neighbors well (listed on the data tables as Phillips DW), located on the property to the north, has had two detections of MtBE; the new property owner there has refused to allow access for their well to be sampled anymore. In correspondence dated July 14, 2009 (available on Geotracker), the EHD directed the site to switch to semi- annual groundwater monitoring and sampling per State Board Resolution 2009-0042. They have been doing this for the past year. A new well, MW-11, was installed in July 2009 for vertical delineation. After two quarters of sampling in which the results were reported as non-detect, the EHD directed the site to switch sampling of this well to a biennial schedule correspondence dated January 26, 2010, available on Geotracker). In Work Plan to Conduct Verification Soil Sampling, Ozone Bench Testing and Vertical Groundwater Evaluation dated October 24, 2008 (available on Geotracker), the consultant proposed collecting soil and groundwater samples to conduct a bench scale test for ozone infusion to address the remaining groundwater contamination. This was approved by the EHD in correspondence dated November 13, 2008 (available on Geotracker). During the fieldwork conducted in July 2009, this sample was collected and the bench scale test was performed. I know they had to conduct extended attenuation tests, but I am still awaiting a report of the bench scale test. Hope this helps, Lori Duncan, Senior REHS San Joaquin County Environmental Health Department Iduncan@sjcehd.com (209)468-0337 phone (209)468-3433 fax From: Hari Patel [mailto:HPATEL@waterboards.ca.gov] Sent: Tuesday,June 08, 2010 12:15 PM To: Lori Duncan [EH] Cc: Bob Trommer; DAVID CHARTER; Kirk Larson Subject: Claim No 8525, Your Case No. 2021 6/9/2010