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J S E CO R } DISCUSSION: Total petroleum hydrocarbons as gasoline (TPHg) were reported in five of the eleven monitoring wells sampled this quarter at concentrations ranging from 90 ppb (MW-1R) to 690 ppb (MW-9)-"Benzene was reported as nondetect above laboratory reporting limits in the eleven wells sampled this quarter Methyl ,fin 1e� tert-butyl ether (MtBE), analyzed using EPA Method $26013, was detected in aof the eleven monitoring o13�1 wells at concentrations ranging from 3 2 ppb (MW-8) to 460 ppb (MW-9) /Tert butyl alcohol (TBA) was detected in five of the wells at concentrations ranging from 130 ppb (MW-1R) to 30,000 ppb (VW-1) The direction of groundwater flow was radially outward, at a gradient ranging from 0 005 to 0 009 ft/ft Groundwater elevations decreased by an average of 0 81 ft Certified laboratory analytical data, chain-of- custody documentation, bill of lading, and field notes are included in Attachment B INTERIM REMEDIAL ACTIVITIES Interim remediation by groundwater batch extraction began in August 2000 for the purpose of plume migration control Interim remedial activities conducted this quarter included the periodic pumping of groundwater from MW-1 Groundwater was pumped twe" times durin1g the first quarter 2003 from the above-mentioned well using a vacuum truck and approximately 54,000 gallons of water were extracted Approximately 706,700 gallons of groundwater have been extracted since interim remediation began in August 2000 Water was hauled by Onyx Industrial, a certified hazardous waste hauler, to ConocoPhillips' Refinery in Rodeo, California for disposal Groundwater removal data is included as Table 4 This report presents our understanding of existing conditions at the subject site The conclusions contained herein are based on the analytical results, and professional judgment in accordance with current standards of professional practice, no other warranty is expressed or implied SECOR assumes no responsibility for data reported by other consultants or contractors ATTACHMENTS: • Table 1 —Groundwater Elevation and Analytical Data • Table 2—Fuel Oxygenates Analytical Data • Table 3—Groundwater Gradient Data • Table 4—Groundwater Removal Data • Figure 1 —Groundwater Elevation Contour Map • Figure 2 - Groundwater Chemical Concentration Map • Attachment A - Field and Laboratory Procedures • Attachment B - Certified Laboratory Analytical Reports, Chain-of-Custody Documentation, Bill of Lading, and Field Data Sheets cc Mr Marty Hartzell, Regional Water Quality Control Board -Central Valley Region (RWQCB-CVR) Mr Paul Supple, BP Ms Vicki McCartney, SJCPHS i i 11ConocoPh1Jhps\Tosco Marketing1111931QMR11QMR03 doc