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0 San Joaquin County • DIRECTOR <br /> Po-�ti Donna Heran,REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street <br /> Laurie Cotulla,REHS <br /> Q � <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> ' Carl Borgman, REHS <br /> c �P Mike Huggins, REHS, RDI <br /> 4<�k8aWebsite: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> 209 464-0138 Jeff Carruesco, REHS, RDI <br /> Fax: <br /> ( ) Kasey Foley,REHS <br /> GREG GAUT <br /> MAY 10 2007 <br /> COMFORT AIR <br /> 1607 TURNPIKE FOAD <br /> STOCKTON CA 95206 <br /> RE: Comfort Air, Ine. SITE CODE: 1266 <br /> 1607 Turnpike ILoad <br /> Stockton, CA 9' 206-1960 <br /> San Joaquin County En vironmental Health Department (EHD) has reviewed Work Plan Addendum <br /> dated April 3, 2007, pri pared and submitted by Advanced GeoEnvironmental, Inc. (AGE) on your <br /> behalf for the above-re renced site. In this work plan, AGE proposes modifying the scope of work <br /> previously approved by HD by letter dated May 7, 2002,that includes reducing the time interval for <br /> conducting the constant ate pumping test from forty-eight hours to twenty-four hours; and relocating <br /> one temporary observat on well from 30 feet north of extraction well EX-1 to 30 feet northwest of <br /> EX-1. <br /> EHD approves the mod fications presented by AGE in the above-referenced work plan. However, <br /> EHD believes the two t porary observation wells need to have the same well construction as EX-1 <br /> with screening intervals from 15 to 35 feet below ground surface. Also,these observation wells must <br /> be developed prior to c ducting the groundwater pumping test. If the temporary observation wells <br /> can not be developed us ng the currently approved construction, then you must submit a modification <br /> to the work plan to insta 1 permanent monitoring wells in place of temporary wells. Please respond to <br /> EHD comments by June 22, 2007. <br /> If you have any questio ,please contact Vicki McCartney at(209)468-9852 or by electronic mail at <br /> vmccartney@sjcehd.co . <br /> Donna Heran,REHS,Dj rector ( / <br /> Environmental Health partm/Jent <br /> Victoria L. McCartney, enior REHS Nuel C.Henderson,Jr.,PG <br /> LOP/Site Mitigation Un t IV Engineering Geologist <br /> LOP/Site Mitigation Unit N <br /> c: James L.L. Barton, PG-CVRWQCB <br /> Ally Colavita- Z LGE <br />