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�! T <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> 4U1" SAN JOAQUINCOUNTY <br /> Donna K.Heran,R.E.H.S. Unit Supervisors <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> AI Olsen,RE.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> �4 Program Manager Douglas W.Wilson,R.E.H.S. <br /> Laurie A.Cotulla,RE.H.S. Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209)464-0138 Robert McClellon,R.E.H.S. <br /> CHRIS WALKER Mark Barcellos,R.E.H.S. <br /> WESTERN OIL & SPREADING INC. <br /> PO BOB 709 <br /> MARTINEZ, CA 94553 <br /> HANS H. HO, Ph.D. <br /> TELFER CONSULTING <br /> 1150 WILLOW PASS RD <br /> PITTSBURG, CA 94565 <br /> Re: Western Oil and Spreading Site Code: 1927 <br /> 19256 N Hwy 99 <br /> Acampo, CA 95220 <br /> WORKPLAN: Addendum to Work Flan for a Phase II Investigation of Plume Boundary <br /> DATED: lune 6,2005 PREPARED BY: D.K. Barber P.E. &Associates (Barber <br /> APPROVED with Conditions (See comment below) <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S <br /> 25296.10(c)(3).) <br /> Install between 6 to 8 direct-push soil borings using cone-penetrometer technology (CPT) to <br /> approximately 60 feet below surface grade (bsg)in order to define the extent of the <br /> groundwater contamination on the site and the neighboring property on 4620 Woodbridge. <br /> COMMENTS AND CONDITIONS: <br /> In a telephone discussion with Dan Barber on June 28,2005,it was agreed that an organic <br /> vapor screening device such as photo-ionization detector (PID) or flame-ionization detector <br /> (FID) will not be used since the low concentration of diesel is not expected to be detectable <br /> in the grab groundwater samples. <br /> Work is scheduled for June 29,2005 <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN(H&S 25296.10 <br /> subd.(C)(3).): <br /> None <br /> DATE June 28.2005 BY t C, <br /> Cc: CRWQCB, Central Valley Regifn—jam s L. . Barton,RG <br /> Cc: D.K. Barber P.E. &Associates—Daniel Barber <br />