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ENVIROAT ENTAL HEALTH %EPARTMENT <br /> Pp W N SAN JOAQUIN COUNTY <br /> Program Coordinators <br /> v <br /> Donna K. HR.E.H.S. <br /> Directorector 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> Margaret Lagorio,R.E.H.S. <br /> c94Fbad�P Assistant Director Telephone: (209)468-3420 Robert McClellan, R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco,R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley, R.E.H.S. <br /> MABEL KEIR MAR 2 3 2007 <br /> 1103 GRANTLINE CT <br /> MODESTO CA 95330 <br /> RE: Lopez Properties SITE CODE: 0001525 <br /> 1601 Turnpike <br /> Stockton, CA 95206 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Monitoring Well <br /> Installation Report dated January 25, 2007, prepared and submitted by Advanced GeoEnvironmental, <br /> Inc. (AGE)on your behalf. Results for soil samples collected from the installation of monitoring well <br /> MW-8 as well as results for groundwater samples collected from MW-8 and reported in Quarterly <br /> Report — Fourth Quarter 2006 dated February 2, 2007, indicate that soil and groundwater are <br /> contaminated at depths of sixty-five feet below surface grade (bsg) at the location of the former <br /> underground storage tank. Based on these results, AGE recommends additional investigation to <br /> define the vertical extent of dissolved petroleum hydrocarbon contamination at the source area and to <br /> determine the possible existence of a commingling plume with the adjacent property located at 1607 <br /> Turnpike Road, Stockton, California. AGE also recommends omitting the analysis for diesel during <br /> the quarterly groundwater monitoring events. <br /> EHD concurs with the recommendations presented by AGE. Please submit a work plan to EHD by <br /> June 5, 2007, that will delineate the vertical extent of groundwater contamination at the source area <br /> and assess the existence of a commingling plume with the property directly south of this site. Provide <br /> technical justification to support all proposed fieldwork. EHD also agrees that the analysis for diesel <br /> may be omitted from the analytical list for groundwater samples collected quarterly since diesel has <br /> not been detected in any soil or groundwater samples collected at this site. <br /> If you have any questions,please contact Vicki McCartney at(209)468-3456 or by electronic mail at <br /> vinccartney@sjcehd.com. <br /> Donna Heran, RENS, Director <br /> Environmental Health Department Q�.,v""r'v 7/�•'['� <br /> G �i! <br /> Victona L. McCartney, Senior REHS Nuel C.Henderson,Jr., PG <br /> LOP/Site Mitigation Unit IV Engineering Geologist <br /> LOP/Site Mitigation Unit IV <br /> c: James L.L. Barton, PG-CVRWQCB <br /> Robert E.Marty -AGE <br />