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TAL SEAL <br /> TH �]EPARTMENT <br /> ENVIRONMEN AUNTY <br /> Qu'N SAN JOAQUIN C Unit Supervisors <br /> o? c Carl Borgman,R.E.H.S. <br /> Donna K.Heran,u.E.H•S• 304 East Weber Avenue,,Third Floor Mike xugg»S,,R.E.U.S.,R.D.I. <br /> Director California 95202-2748 Douglas W.Wilson,R.E.H.S. <br /> '= tOCI:LOri, Margaret Lagorio,R.E.H.S, <br /> Al Olsen,R.E.H.S. <br /> �. LLQ_ .a• Program Manager Telephone: (209) 468-3420 Robert McClellon,R.E.RS. <br /> aei F o a`' Laurie A.Cotulla,R.E.H.S. Fax: 209 464.0138 <br /> Program Manager { ) Mark Barcellos,R.E,H.S. <br /> I <br /> LIZ SEWELL <br /> CONOCOPHILLTPS <br /> 76 BROADWAY <br /> I SACRAMENTO CA 95818 <br /> J <br /> RE: ConocoPhillips Service Station Nos. 11193 Site Code: 1129 <br /> 3202 West Hammer Lane <br /> Stockton, CA 95209 <br /> WORKPLAN: Addendum 'to 'Revised Interim Remedial Action <br /> Plan and Work Plan for Ozone Sparge. Well <br /> Installation' and Additional Off-Site Assessment <br /> DATED: March 29 , 2004 <br /> PREPARED BY: Secor International Incorporated <br /> STATUS: APPROVED with conditions noted below: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health <br /> ,'. Safety Code (H&S) Section 25296 . 10 (c) (3) 1 : <br /> 4 <br /> Advancement of two cone penetrometer testing (CPT) borings <br /> t to define subsurface stratigraphy below 50 feet below <br /> ground surface -(bgs) to a maximum depth of 120 feet .bgs or <br /> until refusal is encountered: Based on the results of the <br /> CPT borings, one to three grab groundwater samples will be <br /> collected from permeable intervals from a borehole <br /> advanced adjacent to each CPT boring to evaluate potential <br /> dissolved phase comtamznation in deeper groundwater' <br /> bearing zones . <br /> ii <br />