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GETTLER - RYAN INC. - � <br /> January 3, 2001 <br /> l <br /> Mr David J Camille <br /> Tosco Marketing Company <br /> 2000 Crow Canyon Road, Suite 400 <br /> San Ramon,California 94583 <br /> Subject: Remedial Status Report for Tosco(Former BP)Station No. 11194 <br /> 2375 Tracy Boulevard,Tracy,California <br /> Mr Camille <br /> At the request of Tosco Marketing Company (Tosco), Gettler-Ryan Inc (GR)has prepared this report <br /> to document groundwater sampling, purging, and disposal for the subject site Activities documented <br /> in this report were initially proposed in GR's Work Plan for Groundwater Purging and Disposal <br /> (Work Plan), dated April 25, 2000 This work was performed to reduce methyl tertiary butyl ether <br /> (MTBE)concentrations in groundwater in the vicinity of the underground storage tank (UST) pit and <br /> groundwater monitoring well MW-2 Up to 5,000 gallons of groundwater have been purged from the <br /> UST pit backfill and disposed of weekly at the Tosco refinery in Rodeo,California <br /> Groundwater Removal and Disposal <br /> Groundwater was removed from the UST pit through the UST pit observation well OBS-W In <br /> conjunction with OBS-W, additional purging was carried out in AMW-5, and MW-2 between July 5, <br /> 2000 and August 14, 2000 accounting for about 10 % of the groundwater purged during this time <br /> period The groundwater was purged from these wells directly into vacuum trucks by Ox Industrial <br /> Services (Onyx) of Benicia,California and transported to the�°sco Refinery in Rodeo,Z ornia for <br /> disposal From May 3, 2000 to September 20, 2000, a.. j rnately_84,600-gallons of groundwater <br /> were removed from the site, primarily from OBS-W Groundwater removal totals and dates are <br /> summarized in Table 2 The locations of OBS-W,AMW-5 and MW-2 are shown on Figure i <br /> Groundwater Sampling <br /> Groundwater samples have been collected periodically from MW-2 and OBS-W and analyzed for <br /> Total Petroleum Hydrocarbons as Gasoline (TPHg) by EPA Method 8015, and benzene, toluene, <br /> ethylbenzene, xylenes (BTEX) and methyl tert-butyl ether (MtBE) by EPA Method 8020 The <br /> analytical results have been used to document hydrocarbon concentration trends and comply with <br /> Tosco Refinery requirements Sample dates and analytical results are summarized in Table 1 <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - -1555 <br />