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i <br /> 100 Pine GCreeC. 10th Fla or /4�2� <br /> San Franaiaca, CA 84111 GEGMATRDC <br /> 14151 434-9400 • FAX [4151 434-1365 <br /> February 17, 1999 <br /> Project 5011 <br /> Ms. Katie Hower <br /> Chevron Pipe Line Company <br /> P.Q. Box 6059 <br /> San Ramon, California 94583-0959 <br /> Subject: Site Investigation Report and Screening-Level Health Risk Assessment <br /> Roberts Property(Former Vernalis Pump Station) <br /> Vernalis, California <br /> Dear Ms. Hower: <br /> On behalf of Chevron Pipe Line Company, Geomatrix Consultants, Inc., has prepared this <br /> report describing site assessment activities and the results of a screening-health risk assessment <br /> for the subject site. Results indicate that the residual petroleum in the subsurface beneath the <br /> site is not significantly impacting groundwater or presenting and unacceptable risk to human <br /> health; however, site conditions, primarily the presence of separate-phase petroleum in the <br /> vicinity of well MW-1, should be discussed with the Central Valley Regional Water Quality <br /> Control Board. <br /> Please call either of the undersigned if you have any questions. <br /> Sincerely, <br /> GEQMA CONSULTANTS, INC. f <br /> M 'in B. Bloes Dawn A. Zemo C.E�,, <br /> Senior Scientist Principal l drogeologist <br /> M BBIDA21pp <br /> I:\Doo_Sak5W0001 NRA Ltr.doc �— <br /> Attachments <br /> Geomatrix Consultants, Inc, <br /> Engineers. Genlogisls, and Environmental Scientists <br />