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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> 2.•:-��,..•, ;� Knit Supervisors <br /> ..�` •. :.� Donna K Heron,R.E.H.S. Third X00£ Carl Borman,R.E.H.S. <br /> ,{ <br /> Director304 East Weber Avenue, <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 DKDI <br /> ouglas Hu R.E.H.S.,R.on,R.E.H.S.H.S. <br /> DougIas N_Wilson,R.E.H.S. <br /> c�a.,--•NSP program Manager Telephone: (209) 468-3420 lviargaret Lagorio,R.E.RS. <br /> Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McCleilon,R.E.H.S. <br /> MarkBarccllos,R.E.H.S. <br /> JAY MCILRATH <br /> JC & M MCILRATH <br /> PO BOX 326 <br /> STOCKTON CA 95201 =' ° ` '� AUG 2 200 <br /> RE: JAMAR Service SITE CODE: 1667 <br /> 4075 Main Street <br /> Stockton CA 95212 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed the <br /> "Second Quarter, 2003 Groundwater Monitoring Report and Additional Assessment <br /> Report" dated June 2003 that was submitted on your behalf by GHH Engineering, Inc, <br /> (GHH)and has the following comments. <br /> The report documents continued site investigation work that took place in May 2003, <br /> • when one'groundwater extraction well was installed on site, four groundwater monitoring <br /> wells were installed offsite, and groundwater extraction feasibility tests were performed. <br /> The report recommends initiation of interim groundwater extraction on site to control <br /> plume migration and begin mass removal of methyl tertiary butyl ether (MtBE). The <br /> report also recommends discontinuing analysis for ethylene dibromide. <br /> SJCIEHD agrees with these recommendations. Please proceed with submittal of a work <br /> plan for installation of an interim pump and treat groundwater extraction system. The <br /> work plan is due no later than October 17, 2003. Routine quarterly groundwater <br /> monitoring and sampling must continue until directed otherwise by this agency. <br /> Results of the reported groundwater monitoring and sampling event indicate that the <br /> vertical and lateral extent of the contaminant plume has not been defined. Of particular'- <br /> concern is the vertical extent of the onsite contamination, and the lateral extent offsite. <br /> Deep discretely screened wells must be installed onsite. Please submit a work plan to <br /> further investigate the extent of the groundwater contamination. The work plan is due no <br /> later than October 24, 2002. <br /> SJC/EHD noted that the field sheets submitted for the May 29, 2003 groundwater <br /> monitoring and sampling event reported the pH of the purged water from wells MW-7A <br /> and MWA was lower than would'be expected, and that the temperatures documented <br /> during the purges of several of the monitoring wells did not stabilize. Please have you <br /> consultant address these issues and comment in the next quarterly groundwater <br /> monitoring report if they continue to be unusual. In addition, depth to water <br /> • measurements noted on the May 29, 2003 hydrodata sheets seem to indicate that, <br /> based on reported times, some of the measurements were taken after purging of some <br /> of the wells had taken place. This will lead to skewed results in determination of <br />