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San Joaquin County DIRECTOR <br /> o pc?U!ry c Donna Heran, REHS <br /> �.. � � Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, RENS <br /> J.' ` ` T :` Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> Carl 8orgman,REHS <br /> Mike Huggins, RENS, RDI <br /> Lr�oR� <br /> Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> Phone: (209)468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 Jeff Carruesco, RENS, RDI <br /> Kasey Foley, REHS <br /> July 28, 2008 <br /> Robert Strong <br /> Ruth Strong Property <br /> 1871 Middlefield <br /> Stockton, CA 95204 <br /> Subject: Ruth Strong Property Site Code: 2054 <br /> 5157 West Business Loop 205 <br /> Tracy, CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed CPT Site <br /> Investigation -- Fourth Quarter 2007 (Report) dated May 2, 2008, and Quarterly Report — <br /> First Quarter 2008 (QMR) dated July 1, 2008 submitted on your behalf by Advanced <br /> GeoEnvironmental (AGE) and has the following comments. <br /> One cone penetrometor test (CPT) boring and two adjacent groundwater sampling borings <br /> were advanced onsite on November 9, 2007. One groundwater sample was collected at <br /> approximately 64-69 feet below surface grade (bsg) and one was collected at approximately <br /> 75-79 feet bsg. Laboratory analytical results reported petroleum hydrocarbon contamination <br /> in both samples; the sample from the deeper interval was at higher concentrations than the <br /> other. In the Report AGE recommends further investigation to define the vertical extent of <br /> the groundwater contamination. <br /> The EHD agrees that the reported contamination in the groundwater grab samples should be <br /> verified and recommends installation of one deep, discretely screened groundwater <br /> monitoring well located down-gradient to MW-5. <br /> Please proceed with submittal of a Work Plan to investigate the vertical extent of the <br /> dissolved contamination. The Work Plan is due for submittal to the EHD no later than <br /> September 12, 2008. If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, <br /> Lori Duncan, REHS Nuel C. Henderson, Jr., PG <br /> ` Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive #200, Rancho Cordova CA 95670 <br /> Brian Millman, AGE, 837 Shaw Road, Stockton CA 95215 <br />