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4 <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUI'q'TY <br /> �o.•`�.coG UrtitSun ervisnrs <br /> Donna K.Heran,R.E.H.S. Third Floor Carl Borgman,R.E.H.S. <br /> 304 East Weber Avenue, <br /> N: Direclol° Mike Huggins,R.E.H.S.,R.D.I. <br /> AI Olsen,R.E.H.S. Stockton, California 95202-270$ <br /> Douglas W.Wilson,R.E.II.S. <br /> Problan Manager Telephone: (209) 46$-3420 Margaret Lagorio,R.E.H.S. <br /> 9QF6y`' Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager FaX: (209} 464-OI38 Mark Barcellos,R.E.H.S. <br /> JONATHAN MARLOWE <br /> MARLOWE PROPERTIES <br /> PO BOX 1.50211 <br /> SAN RAFAEL CA 94915-0211. <br /> RE: Marlowe Property SITE CODE: 1828 <br /> 4648 Waterloo Road <br /> Stockton CA 95215 <br /> San Joaquin County Environmental Health Department (SJCIEHD) has reviewed <br /> Quarterly Report— Third Quarter 2004, dated December 3, 2004, submitted on your <br /> behalf by Advanced GeoEnvironmental, Inc. (AGE) and has the following comments. <br /> The report documents a routine groundwater monitoring and sampling event conducted <br /> on September 27, 2004. Groundwater samples were collected from the site monitoring <br /> wells and submitted for laboratory analysis. Analytical results were non-detect for all <br /> constituents analyzed except for 1,2-dichloroethane (1,2-DCA), which was detected in <br /> three of the six wells sampled. The report recommends additional investigation to define <br /> the limits of the 1,2-DCA plume, and to prepare an interim remediation plan for mitigation <br /> of the potential impact of 1,2-DCA on a nearby receptor. <br /> SJCIEHD agrees with the recommendation to complete the investigation at this site. <br /> The extent of the plume should be determined, however, before active remediation <br /> begins. Please submit a work plan, in the context of a site conceptual model, to define <br /> the vertical and lateral extent of the 1,2-DCA plume at this site. The work plan is due no <br /> later than February 25, 2005. <br /> If you have any questions or comments, please call Lori Duncan at (209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, CVRWQCB <br /> Brian Millman, AGE ` <br />