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• DIRECTOR <br /> San Joaquin County Donna Heran,REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> r ?� <br /> N: ., Stockton, California 95202-3029 PCad Borgman REHS <br /> Mike Huggins,REHS,RDI <br /> P. Website: WWW.sjgov.org/ehd Margaret Lagorio,REHS <br /> qtr FORM Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 Jeff CawleRENS,RDI <br /> Kasey Foley,y,R REHS <br /> JUL 0 5 2007 <br /> MABEL KEIR <br /> 1103 GRANTLINE CT <br /> MODESTO CA 95330 <br /> SITE CODE: 0001525 <br /> RE: Lopez Properties <br /> 1601 Turnpike <br /> Stockton, CA 95206 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Additional Site <br /> Assessment Work Plan —Monitoring Well Installation dated May 21, 2007, prepared and submitted <br /> by Advanced GeoEnvironmental, Inc. (AGE) on your behalf. In this work plan AGE proposes to <br /> install three monitoring wells at this site. Two wells (MW-10 and MW-11)will have a total depth of <br /> approximately 65 feet below surface grade (bsg) to determine whether there is a commingling <br /> at1607 <br /> of 1,2-dichloroethane (1,2-DCA) occurring at this depth with the adjacent property <br /> located Turnpike Road. One well(MW-9)will have a total depth of approximately 120 feet bsg to define and <br /> monitor the vertical extent of petroleum hydrocarbon contamination in groundwater at the source <br /> area. <br /> EHD does not approve this work plan for the following reasons. Throughout this work plan different <br /> screened intervals are proposed for MW-10 and MW-11. It is unclear to EHD whether the proposed <br /> screened intervals for both wells will be 55 to 65 feet bsg or 60 and 65 feet bsg. Please provide <br /> clarification whether these wells will have a five or ten-foot screened interval. <br /> EHD has reviewed soil lithology generated for CPT-1 and MW-13 located at the adjacent property of <br /> 1607 Turnpike Road. On that site there is a sand layer identified between 80 and 110 feet bsg for <br /> MW-13. EHD believes that if the same sand is present on your site, a well screened between 80 and <br /> 90 feet bsg, instead of 110 and 120 feet bsg, will better define the vertical extent of petroleum <br /> hydrocarbon contamination at the source area. <br /> Please respond to EHD's comments presented in this letter by August 10, 2007. If you have <br /> any questions, please contact Vicki McCartney at (209) 468-9852 or by electronic mail at <br /> vinccartney@sjcehd.com. <br /> Donna Heran,REHS,Director <br /> Environmental Health Dep(aarretm6ent <br /> Nuel C. Henderson, Jr,PG <br /> Victoria L.McCartney, Senior REHS Engineering Geologist <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit 1V <br /> c: James L.L.Barton,PG -CVRWQCB <br /> Ally L. Colavita-AGE <br />