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California Reional Water Qualityntrol Board <br /> Central Valley Region <br /> Karl E.Longley,ScD,P.E.,Chair <br /> Arnold <br /> Linda S.Adams a� <br /> Secreiaryfor 11020 Sun Centdry��', art��1-?v+t(0Q���,�RI�����nQ�ryryryr1�° alifomia 95670-6114 Schwarzenegger <br /> Environmental Pht.1,5(6e{1391�•\q 6) 64-4645 Governor <br /> Protection. htt```"'p"'''':/ rLLad��C(((e4}4 oauFFNHs�. a�����JJJJJ ralvalley <br /> 15 October 2009 OCT 1 6 2009 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Mr. Mark Buller <br /> 1137 South Stockton Street <br /> Stockton, CA 95206 <br /> ADDITIONAL ASSESSMENT WORK PLAN, IDEALEASE, 1137 SOUTH STOCKTON <br /> STREET, STOCKTON, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed the 22 September 2009 Additional Assessment Work Plan (Work Plan) <br /> submitted by Advanced GeoEnvironmental, Inc. (AGE) on behalf of Idealease for the property <br /> at 1137 South Stockton Street in Stockton (Site). <br /> The Site is in an industrial and commercial area of west Stockton. Site features include an <br /> office building, truck wash facility, fuel dispenser area, and one 12,000-gallon diesel <br /> aboveground tank (AGT). <br /> Idealease prepared this work plan to define the lateral and vertical extent of petroleum <br /> hydrocarbon contamination at the Site. The Work Plan proposes drilling one shallow soil <br /> boring to about 10 feet below ground surface (bgs) and 10 deep borings to about 30 feet bgs. <br /> Idealease will collect soil samples in five-foot intervals and grab groundwater samples from the <br /> deep borings. Idealease will analyze selected soil samples for total petroleum hydrocarbons <br /> as diesel, benzene, toluene, ethylbenzene, and xylenes. Four of the deep borings will be <br /> converted to monitoring wells. <br /> Our comments are presented below: <br /> 1. Central Valley Water Board staff concurs with the drilling of 11 soil borings and <br /> installation of four monitoring wells at the Site to define the lateral and vertical extent of <br /> contamination. By 12 February 2010, Idealease needs to drill the soil borings, install <br /> the monitoring wells, analyze the soil and grab groundwater samples, collect samples <br /> from the new monitoring wells, and submit a report of findings. The report of findings <br /> needs to include a summary of the analytical data, calculations showing groundwater <br /> flow directions, and recommendations for additional work, if necessary. <br /> 2. The Work Plan states that the deep soil borings will be advanced to 30 feet bgs or until <br /> soil samples no longer demonstrate hydrocarbon contamination. It is not clear how <br /> Idealease will determine when to terminate these soil borings. By 14 November 2009, <br /> Idealease needs to submit a work plan addendum that describes how it will determine <br /> when to terminate the deep borings and define the vertical extent of contamination. <br /> California Environmental Protection Agency <br /> ea Recycled Paper <br />