Laserfiche WebLink
p ' <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SANJOAQUIN COUNTY T (7nit Srrpervhors <br /> f '?� Donna K. Her an, R.E.H.S. Carl Bor man R. E.H. S <br /> 3 < Direuor 304 East Weber Avenue, Third Floor g <br /> . I 1Mike Huggins R r 11 S., R.D.I. <br /> At oFsen, R .r..H.S. Stockton , California 95202-2708 Douglas W. Wilson R. E.H.S . <br /> Progr nm A4 Hager Telephone : (209) 469- 3420 Margaret Lagouo, R.E. ILS. <br /> 9 � rFORN` Laurie A. Cotulla, R.E.H.S. <br /> Fax : (209) 464-0138 aohert McClellan , R. E.H .S . <br /> j Progran, Manager - Mark Barcellos, R.E.H.S. <br /> JAY COFFEY <br /> CITY OF STOCKTON <br /> DEPARTMENT OF HOUSING AND REDEVELOPMENT <br /> 305 NORTH EL DORADO STREET <br /> STOCKTON CA 95202 <br /> RE: Former San Joaquin County Motor Pool Site <br /> 130 North Hunter Street <br /> Stockton, CA 95202 <br /> WORKPLAN: Addendum to 41November2004 Work Plan <br /> DATED: January 20, 2005 <br /> PREPARED BY: Treadwell & Rollo Inc. by DuStyne Sutherland and David G. Dixon R.G. <br /> APPROVED X <br /> DISAPPROVED El <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPI 1N [Health & Safety Code <br /> (H&S) Section 25296. 10(c) (3)1 : <br /> Advancement of two soil borings, SB-6 and SB-7, to depths of approximately 70 feet below <br /> ground surface (bgs) to further define the lateral extent of impacted soil and groundwater <br /> north and east of the former underground storage tank locations . <br /> Collection of two grab groundwater samples from each borehole, one in the shallow zone at <br /> approximately 30 feet bgs, and one in the deep zone at approximately 60 feet bgs. <br /> • Collection of soil samples at five-foot intervals between 50 and 70 feet bgs to determine the <br /> lithologic characterizations, and based on field observations, selected soil samples may be <br /> analyzed for chemicals of concern. <br /> Analysis of groundwater samples for total petroleum hydrocarbons as gasoline (TPH-G); <br /> benzene, toluene, ethyl benzene, total xylenes (BTEX); 1 ,2-dichloroethane (1 ,2-DCA), 1 ,2- <br /> dibromoethane (EDB), methyl tertiary-butyl ether (MTBE), diisopropyl ether (DIPE), <br /> tertiary-amyl methyl ether (TAME), ethyl tertiary-butyl ether (ETBE), tertiary-butyl alcohol <br /> (TBA), methanol, and ethanol, by U. S . Environmental Protection Agency (EPA) SW-846 <br /> Method 826013 , and total extractable petroleum hydrocarbons as kerosene (TEPH-kerosene) <br /> by EPA SW-846 Method 8015B . Please ensure the reporting limit for 1 ,2-DCA is at least <br /> 0 .5 micrograms per liter (µg/L) . Groundwater samples detected with high concentrations of <br /> TEPH-kerosene may undergo silica gel clean up and both results (before and after clean-up) <br /> will be reported. <br /> Analysis of selected soil samples for TPH-G by EPA SW-846 Method 801513 ; BTEX, and <br /> MTBE by EPA SW-846 Method 8021 ; and TEPH-kerosene by EPA SW-846 Method 8015B . <br /> Soil samples detected with high concentrations of TEPH-kerosene may undergo silica gel <br /> clean up and both results (before and after clean-up) will be reported. <br />