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d <br /> 6ETTLER - RYAN INC . <br /> April 27 , 1999 <br /> Mr. Harlin Knoll, R. E.H . S . <br /> Public Health Services San Joaquin County <br /> Environmental Health Division <br /> P.O . Box 2009 <br /> Stockton, California 95201 <br /> Subject: Request to Amend the Gcttler-Ryan Inc. , Arork Plan for Additional Sullsurface <br /> Asiecsment at Chevron Products Company Station Number 9-3232, 8660 Lover <br /> Sacramento Road, Stockton, California, Report No. 346463.04-1 , Dated March 26, 1999. <br /> Mr. Knoll : <br /> Gettler-Ryan Inc. (GR) on behalf of Chevron Products Company (Chevron) is requesting that the <br /> March 26 , 1999, 'Work Plait for Additional Subsurface Investigation at die Chevron Station No. <br /> 9-3232 be amended to substitute hollow stem auger boring techniques in place of the originally <br /> proposed Geoprobe® push technology. <br /> Because of hard soils encountered at the subject site, the Geoprobell push technology was only <br /> capable of reaching 45 feet below ground surface (bgs) . 'The original work plan proposed that soil <br /> borings be advanced to 60 feet bgs . We are proposing to use hollow stem auger techniques, which <br /> should reach the required depth at this site . <br /> Soil borings will be sampled at five foot intervals as prescribed in the March 26, 1999, Work Plan. <br /> Soil borings will be backfilled with mixture of neat cement and approximately 5 % bentonite grout <br /> using tremie methods . Soil cuttings from the borings will be properly analyzed and disposed of along <br /> with stockpiled soil removed from the tank excavation. <br /> A copy of the GR Field Methods and Procedures for hollow stem auger drilling techniques is <br /> attached . We are proposing to use Bay Area Exploration , Inc. (C-57-522125) to complete this work. <br /> opy of the active drii}itng pemnit na;nin0 B „El as the driller is attached. We are planning on <br /> beginning drilling activities on Wednesday, May 5 , 1999 . <br /> If you have any questions, please call in our Rancho Cordova office at (916) 631-1300 . <br /> Sincerely , <br /> Gcttler-Ryan Inc. <br /> Ric' Fears , R .G . <br /> Senior Geologist <br /> cc: Mr. Brett Hunter, Chevron Products Company, P. O . Box 6004 , San Ramon, California 94583 <br /> 346463.04 <br /> 6747 Sierra Court , Suite J Dublin , California 94568 925 551 - 7555 <br />