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GETTLER - RYAN INC. nlav 1 s �flnj _ ENVIRON , PER VICE November 13, 2001 J Mr Edward C Ralston Phillips 66 Company 1380 Lead Hill Road, Suite 120 Roseville,California 95661 Subject: Remedial Status Report for Tosco(Former BP) Station No. 11193 3202 West Hammer Lane,Stockton, California. Mr Ralston At the request of Tosco Corporation, a subsidiary of Phillips Petroleum Company (Tosco), Gettler-Ryan Inc (GR) has prepared this report to document groundwater sampling, purging and disposal conducted for the subject site Activities documented in this report were initially proposed in GR's Interim Migration Control Plan (IMCP), dated April, 19, 2000 The IMCP was conditionally approved by the San Joaquin County Public Health Services — Environmental Health Division (SJCPHS-EHD) in a written transmittal dated April 21, 2000 In an effort to reduce Methyl tertiary-Butyl Ether (MTBE) concentrations in groundwater beneath the • underground storage tank (UST) pit, approximately 5,000 gallons of groundwater has been purged weekly from groundwater monitoring well MW-1 The effect of the groundwater removal on static groundwater levels in other monitoring wells in the vicinity was monitored during the initial purging event In addition, grab groundwater samples have been collected periodically to evaluate the effectiveness of groundwater removal in reducing MTBE concentrations in the UST pit area The analytical results are included in this status report GROUNDWATER REMOVAL AND DISPOSAL I Beginning on June 16, 2000, approximately 5,000 gallons of groundwater has been purged weekly from groundwater monitoring well MW-1 The groundwater was purged from MW-1 directly into vacuum trucks by Onyx Industrial Services (Onyx) of Benicia, California and transported to the Tosco Refinery in Rodeo, California for disposal From August 3, 2000 to October 2, 2001, approximately 274,800 gallons of groundwater were removed from the site Groundwater removal totals and dates are summarized in Table 1 The location of MW-1 is shown on Figure 1 GROUNDWATER SAMPLING Groundwater samples were collected periodically from MW-1 and additional wells at the site Groundwater samples are submitted under Chain of Custody for analysis by Sequoia Analytical (ELAP #1271) Groundwater samples are analyzed for Total Petroleum Hydrocarbons as Gasoline (TPHg), benzene, toluene, ethylbenzene and xylenes (BTEX) and methyl tertiary butyl ether (MTBE) by EPA Methods 8015 and 8020 The analytical results are summarized in Table 1 The Laboratory Analytical .} Reports and Chain of Custody documents are attached 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555