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California Re onal Water Quality Antrol Board -°" <br /> Central Valley Region <br /> Karl E.Langley,ScD,P.E.,Chair <br /> Linda S.Adams <br /> Secremryfor 11020 Sun Center Drive 4200,Rancho Cordova,California 95670 <br /> Environmental Phone(916)464-3291 •FAX(916)464-4645 - <br /> Protection http://www.waterboards.ca.gov/centralvalley <br /> MAY 2 6 2063 <br /> 22 May 2009 ENVIRON <br /> MENT HEALTH <br /> PERMIT/SERVICES <br /> Mr. Mark Buller <br /> 1137 South Stockton Street <br /> Stockton, CA 95206 <br /> PRELIMINARY SITE 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 11 May 2009 Preliminary Site 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 /> In April 2009, Idealease discovered petroleum contaminated pea gravel during the removal <br /> and replacement of concrete near the fueling islands. The Work Plan notes that this suggests <br /> a leak of diesel from the AGT fueling system. Later in April, Idealease removed the concrete <br /> covering the subsurface product piping and found a leaking coupling in the dispenser area. <br /> Idealease subsequently removed about 60 gallons of free product from the excavation, <br /> repaired the piping, and backfilled the excavation. <br /> The Work Plan proposes drilling eight soil borings around the perimeter of the dispensers and <br /> product piping to 10 feet below ground surface (bgs) and two borings near the dispensers to <br /> 20 feet bgs. Idealease proposes collecting soil samples at 2.5-foot intervals and analyzing <br /> some of them for total petroleum hydrocarbons as diesel (TPHd), and benzene, toluene. <br /> ethylbenzene, and xylenes (collectively BTEX). In addition, Idealease will collect grab <br /> groundwater samples from the 20-foot bgs soil borings and analyze them for TPHd and BTEX. <br /> Our comments are listed below: <br /> 1. Central Valley Water Board staff concurs with the installation of 10 soil borings at the <br /> Site and the collection of soil and groundwater samples. By 31 August 2009, <br /> Idealease needs to drill the borings; collect and analyze the soil and groundwater <br /> samples; and submit a report of findings. The report of findings needs to include <br /> recommendations for future work, if necessary. <br /> 2. Idealease needs to collect and analyze soil samples at 2.5-foot intervals in all of the soil <br /> borings. <br /> California Environmental Protection Agency <br /> Pips Recycled Paper <br />