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I � <br /> l <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair p <br /> Terry Tamminen <br /> Arnold Schwarzenegger <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 <br /> Protection 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 <br /> Phone(916)464-3291 Fax(916)464-4797 <br /> 30 January 2004 <br /> Mr. Thomas Brenkwitz <br /> 3707 Kenner Road <br /> Tracy, CA 95378 <br /> COMFORT LETTER REGARDING PROPERTY AT 541 WEST GRANT LINE ROAD, <br /> TRACY, SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Regional Board) has reviewed <br /> the 8 December 2003 Field Investigation Report and Request for a Comfort Letter (Report) <br /> submitted by Treadwell & Rollo (T&R) on your behalf for your property at 541 West Grant Line <br /> Road in Tracy(site). The request for a comfort letter is based on detections of petroleum <br /> hydrocarbons on your property that may be associated with other known petroleum hydrocarbon <br /> polluted sites in the vicinity of your property. In addition to the Report, T&R submitted the <br /> following for our consideration of issuing a comfort letter: <br /> • May 1996 Report on Emergency Remediation for Continuation of Construction (prepared <br /> for 2480 Tracy Boulevard property); <br /> • 1 November 1999 Environmental Condition of Subsurface Proposed Grant Line Auto <br /> Center, <br /> • 3 June 2003 Site Assessment Report; and <br /> • 3 September 2003 Field Investigation Work Plan. <br /> The Report provides soil and grab groundwater sampling results from 29 borings on and around <br /> the site, as well as results from investigations of petroleum hydrocarbon polluted sites in the <br /> proximity of the site. There are low level detections of total petroleum hydrocarbons (TPH) as <br /> diesel and TPH as motor oil at the groundwater/soil interface or capillary fringe. TPH as <br /> gasoline was detected at 1,100 and 1,800 milligrams per kilogram in two deeper interval soil <br /> samples. Of 23 grab groundwater samples, only one sample did not contain TPH. The <br /> groundwater contains TPH as gasoline up to 900,000 micrograms per liter (µg/1), TPH as diesel <br /> up to 340,000 µg/1, and TPH as jet fuel up to 390,000 µg/1. The highest concentrations in soil <br /> and groundwater were recorded from samples collected to the north and northeast of the site, <br /> which based on information from adjacent sites are up and cross gradient of the site, respectively. <br /> California Environmental Protection Agency <br /> �c?Recycled Paper <br />