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San Joaquin County DIRECTOR <br /> oPO.!-�.!N c Donna Heran, REHS <br /> ,. _ Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> c 600 East Main Street Laurie Cotulla, REHS <br /> N' III Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> cq��Foa��P Website: www.sjgov.org/ehd Mike Huggins, REHS, RDI <br /> Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 .teff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> Don Smail <br /> City of Stockton Redevelopment Department JAN 2 3 2008 <br /> Central Parking District <br /> 425 North EI Dorado Street 3rd Floor <br /> Stockton CA 95202-2317 <br /> Subject: 216 North California Street Site Code: 1687 <br /> Stockton CA 95202 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Underground <br /> Storage Tank Closure Sampling Work Plan (Work Plan) dated January 15, 2008, submitted on <br /> your behalf by Condor Earth Technologies, Inc. (Condor) and has the following comments. <br /> In the Work Plan Condor proposes to begin the investigation of the vertical and lateral extent of <br /> the petroleum hydrocarbon contamination at this former underground storage tank (UST) site <br /> with the advancement of five direct push Geoprobe soil borings. Continuous soil cores will be <br /> collected during the advancement of each boring. Soil and grab groundwater samples will be <br /> collected from each boring and submitted for laboratory analysis. The analytical suite includes <br /> lead, benzene, toluene, xylenes, ethylbenzene and total petroleum hydrocarbons as diesel. <br /> One boring will be advanced near the center of the former UST pit to investigate the vertical <br /> extent of the contamination. It is anticipated that this boring will not extend further than 50 feet <br /> below surface grade (bsg). Soil samples for analysis will be collected at 20 and 30 feet bsg, or <br /> at intervals with obvious signs of contamination. Four additional borings will be advanced <br /> surrounding the former UST pit to investigate the lateral extent of the contamination. Soil <br /> samples for analysis will be collected from the lateral borings at 10 and 20 feet bsg; if there is <br /> indication of contamination at depth the borings will be extended but are not expected to be <br /> deeper than 50 feet bsg. A minimum of 10 soil samples (two from each boring) and five grab <br /> groundwater samples will be submitted for analysis. More soil samples may be submitted for <br /> analysis if needed to adequately define the contamination. <br /> The EHD approves the scope of work outlined in the Work Plan with the condition that the <br /> lateral borings are advanced and sampled to the same maximum depth as the boring in the <br /> former UST pit area. If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr. PG <br /> Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive, #200, Rancho Cordova CA 95670 <br /> Bill Cook, Condor, 188 Frank West Circle, Suite 1, Stockton CA 95206 <br />