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California Regional Water Quality Control Board <br /> Central Valley Region <br /> =by-� <br /> . Robert Schneider,Chair <br /> Terry Tamminen Fresno Branch Office Arnold Schwarzenegger <br /> Secretary.for Internet Address: http://www.swrcb.ca.gov/—rwgcb5 Governor <br /> Environmental 1655 E Street,'Fresno,California 93706-2020 <br /> Protection Phone(559)445-51.16•FAX(559)445-5910 <br /> i <br /> RZ5�c <br /> 10 February 2004 V�� • <br /> E� FEB 2009 <br /> o <br /> Mr. Scott Mansholt pFREIUr��AtT <br /> ChevronTexaco SFRV/�� N <br /> Chevron Environmental Management Company <br /> P.O. Box 6012 �— �.__ _ - •- -- - <br /> San Ramon, CA 94583 <br /> ADDITIONAL SOIL AND GROUNDWATER INVESTIGATION BORINGS PROPOSAL- <br /> POMBO PROPERTY, TRACY, SAN JOAQUIN COUNTY <br /> We have reviewed the above referenced-document, dated 27 January 2004, for the ChevronTexaco Old <br /> Valley Pipeline (OVP) project at the Pombo property in Tracy, San Joaquin County. The proposal is for <br /> the installation of five additional temporary step--out borings downgradient of those installed and sampled <br /> in November 2003. Based on the findings of the November 2003 investigation, ChevronTexaco has <br /> requested that additional borings be advanced at the property. <br /> The purpose is to delineate the lateral extent of total petroleum hydrocarbon (TPH)-impacted <br /> groundwater downgradient. The additional investigation will be conducted in accordance with the <br /> workplan approved by Regional Board staff 21 August 2003. <br /> We concur with the additional investigation as presented in'the referenced document. Please notify <br /> Regional Board staff at least 48 hours prior to commencing field activities. i <br /> Ifyouu have:any...gpi stions�or.comments..please contact Dean.Hubbard.at.(5.59)445-5179_ <br /> �-�-_ m <br /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Associate Engineering Geologist <br /> RG No. 63.57 <br /> cc: Mr. Michael Infurna, Jr., San Joaquin County EHD,Mode <br /> Mr. Ernie Pombo, Jr., Tracy <br /> Ms. Barbara Kleinert, WSID, Tracy <br /> Mr. Luis Mercado, SAIC, Sacramento - <br /> SLIC/E/ChevronTexaco/Pon bo . <br /> California Environmental Protection Agency <br /> CRecycled Paper <br />