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6ETTLER - RYAN INC. <br /> i - <br /> , <br /> December 25, 2000 <br /> Mr David J Camille <br /> Tosco Marketing Company <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon,CA 94583 <br /> RE: Fourth Weekly Event of December 5,2000 <br /> Groundwater Purging and Disposal <br /> Tosca (Former BP) No. 11192 <br /> 1403 Country Club Boulevard,Stockton, California <br /> Mr Camille <br /> At the request of Tosco Marketing Company (Tosco), Gettler-Ryan Inc (GR) has prepared this <br /> report to document groundwater sampling, purging and disposal conducted for the subject site <br /> The work was performed in accordance the Gl�'s Work Plan for Groundwater Purging and <br /> Disposal, dated September 6, 2000, and with the San Joaquin County Environmental Health <br /> Division correspondence dated November 2, 2000 <br /> Groundwater Purging and Disposal <br /> On December 5,2000, approximately 3,300 gallons of groundwater were removed from monitoring <br /> well MW-3 by Onyx Industrial Services (Onyx) of Benicia, California The groundwater was <br /> purged directly from the wells into a Onyx vacuum truck and transported to the Tosco Refinery in <br /> Rodeo, California for disposal <br /> Groundwater Sampling <br /> Groundwater samples were collected from MW-3 prior to and following purging A water <br /> sample was also collected from the purged groundwater prior to its removal from site <br /> Groundwater samples are submitted under Chain of Custody for analysis at Sequoia Analytical <br /> (ELAP # 127 1) Groundwater samples are analyzed for Total Petroleum Hydrocarbons as <br /> Gasoline (TPHg) by EPA Method 8015, benzene, toluene, ethylbenzene, and xylenes (BTEX) by <br /> EPA Method 8020, and methyl tert-butyl ether (MTBE) by EPA Method 8260 The analytical <br /> results for the December 5, 2000 sampling event are summarized in Table 1 <br /> MTBE Mass Removal <br /> The estimated mass of MTBE removed was calculated using the average the MTBE <br /> concentration from the pre-purging (MW-3-PRE) and post-purging (MW-3-POST) grab <br /> groundwater samples Based on this average concentration, an estimated total of 3 44 pounds of <br /> MTBE was removed from the site during the December 5, 2000 purgmg'event The estimated <br />. MTBE removed, the cumulative MTBE removed, and the calculation method are presented in <br /> Table 1 <br /> 6747 Sierra Court , Suite J Dublin , California 94568 • ( 9 2 5 ) 559 - 7555 <br />