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California Ronal Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Fresno office Arnold Schwarzenegger <br /> California 93706 Governor <br /> Terry Tamminen 1685 E Street,Fresno, 445-5910 <br /> Phone(559)445-5116.'FAX(559) <br /> Secretnryjor Internet Address: htlp:l/wwwswrcb.ca.gov/—rw9cb5 <br /> Environmental <br /> Protection <br /> 14 May 2004 <br /> Mr. M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> Property Management <br /> 6001 Bollinger Canyon Road <br /> P. 0. Box 6012 <br /> San Ramon, CA 94583-0712 <br /> FIRST SEMIANNUAL2004 <br /> ANUARIOAQUN COUNTY ROUNDWATER MONITORING REPORT <br /> ALDEN PARK, <br /> en <br /> We have reviewed the First Semiannual 2004 Groundwater Moni7oorinngReport d for Chevron Environment <br /> alen <br /> Park, Tracy, San Joaquin County (report), dated 19 April 2004,prepared The monitoring was <br /> Management Company by Science Applications International Corporation(SAIC). <br /> conducted in accordance itgroundwaterotoning and <br /> Re monitoringng analytical Program s 5-20or the0former Old ValThe report ley <br /> ides <br /> the 18 and 19 February <br /> Pipeline fuel oil reservoir site now occupied by Alden Park in Tracy, CA. <br /> There are 21 monitoring wells associated with this project; eleven C ncen the ells were <br /> purgl petiole mpled, <br /> nine wells contained free product, and one well (MW-2)w as dry'. ca gel cleanup), was reported in <br /> hydrocarbons as diesel (TPH-d) at 560 µg/L and 130 µo <br /> MW-7iand on of the results notedly, downgradient above, PH-d was notd detected northwest)and the remain ng mon for reservoir. <br /> e <br /> except were not detected in any of the monitoring wells <br /> polynuclear aromatic hydrocarbon compounds (PAHs) <br /> this event. <br /> product thickness ranged from a sheen to a maximum of 2.50 feet in MW 16. <br /> During this event, floating <br /> dct was removed this quarter. Sinceproduct <br /> Approximately 7 gallons of floating proud from the monitoring ells containing <br /> initiated in April 1997, over 377 gallons have been remove <br /> product. <br /> Based on our review we have the following additional comments: <br /> Previously, in a memorandum to ChevronTexaco dated 20 November 2003,Regional Board staff <br /> requested that beginning with the current semi-annual monitoring event,total depths for each of <br /> California Environmental Protection Agency <br /> CO Recycled Paper <br />