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San Joaquin County DIRECTOR <br /> PQ tN Donna Heran, REHS <br /> .CQ Envi onmental Health Department ASSISTANT DIRECTOR <br /> G <br /> 600 East Main Street <br /> Laurie Cotulla, REHS <br /> ` ' < Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> _ Mike Huggins,REHS,RDI <br /> Margaret Lagorio,REHS <br /> �" •. �P Website: www.sjgov.org/ehd Robert McClellon, REHS <br /> 4L%FORa <br /> Phone: (209)468-3420 Jeff Carruesco, RENS, RDI <br /> Fax: (209) 464-0138 Kasey Foley, REHS <br /> April 2, 2009 <br /> Ms. Mabel Keir Ms. Nercida P. Lopez <br /> 1103 Grantland Court P. O. Box 6569 <br /> Modesto, California 9 350 Stockton, California 95206 <br /> Ms. Judy Kindle <br /> 4946 Patric Way <br /> Carmichael, CaliforniE 95608 <br /> Subject: Lopez Properties <br /> 1601 Turnpike Road <br /> Stockton, California 95206 <br /> The San Joaquin C unty Environmental Health Department (EHD) has reviewed <br /> Additional Site Assesvment Report — September 2008 dated December 9, 2008, and <br /> Quarterly Groundwak r Monitoring Report—Fourth Quarter 2008 dated January 15, 2009, <br /> submitted by Advanc d GeoEnvironmental, Inc. (AGE) for the above-referenced site on <br /> your behalf In the Site assessment report, AGE presents results from advancing cone <br /> penetration test (CPT) boring CPT-1 to total depth of 180 feet below surface grade (bsg) in <br /> the former underground storage tank (UST) area, and collection of twelve depth-discrete <br /> grab groundwater samples from nine on-site soil borings and three off-site soil borings. In <br /> the fourth quarter 200 report, AGE concludes the following: <br /> • The lateral ex ent of petroleum-hydrocarbon-impacted groundwater is defined in <br /> all directions om the former USTs in the water table zone between twenty and <br /> thirty-five feet bsg. <br /> • Contaminants of concern were reported in groundwater samples collected from <br /> monitoring wells MW-2 and MW-4 for the first time since November 2005 and <br /> December 2006, respectively. <br /> • The lateral ex ent of petroleum-hydrocarbon-impacted groundwater is defined in <br /> the all directions except east of the former USTs in the fifty to sixty-five feet bsg <br /> water-bearing zone. <br /> • Petroleum-hydrocarbon-impacted groundwater samples collected from off-site <br /> Comfort Air monitoring well MW-8B, screened between sixty and sixty-five feet <br /> bsg, appear to be the result of an unauthorized release from the former USTs at the <br /> Lopez site. <br />