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California Regional Water Quality Control Board <br /> Central Valley Region ! . <br /> Robert Schneider,Chair <br /> Alan C.Lloyd,Ph.D. Arnold <br /> secretaryfor Fresno Branch Office Schwarzenegger <br /> Environmental 1685 E Street,Fresno,California 93706 Governor <br /> Protection (559)445-5116-Fax(559)445-5910 <br /> hftp://www.waterboards.ca.gov/centralvalley <br /> 25 October 2005 <br /> tl1 E <br /> 0%IC, G005 <br /> M. Scott Mansholt <br /> Chevron Environmental Management Company EiVVin NIIT/ i`d I HEALTH <br /> 6001 Bollinger Canyon Road, Room K2066 PE13i'��{T%,�Er�VlCES <br /> San Ramon, CA 94583-2324 <br /> REVIEW OF SOIL AND GROUNDWATER E VAL UA TION AND DRA FT ANAL YTICAL RESULTS <br /> — VERNA LIS P UMP S TA TION PR OPER TY, VERNALIS, SA N JOA Q UIN A ND STANISLAUS <br /> COUNTIES <br /> We have reviewed the Soil and Groundwater Evaluation and Draft Analytical Results, Vernalis Pump <br /> Station Property, 35500 Welty Road, Vernalis, dated 28 June 2005 for the Chevron Old Valley Pipeline <br /> (OVP)project site, near Vernalis, CA. The site consists of two separate properties: Bellini (formerly <br /> known as Roberts) and the Arcos property. Bellini is the northern triangular shape portion, covering <br /> 5.73 acres and is generally vacant at this time. The Arcos site, adjacent to the south, is used as a storage <br /> facility for miscellaneous materials and equipment. The Arcos site also contains a residence and an <br /> office. The Vernalis site is located in a rural and light-industrial area. <br /> The purpose of the investigation was to characterize subsurface soils and groundwater in the vicinity of <br /> the former OVP pump station and pipeline right-of-way alignment. The report describes the installation <br /> of soil borings and collection of samples for laboratory analysis to provide an evaluation of the extent of <br /> total petroleum hydrocarbon (TPH)-impacted soil and groundwater. Regional Board staff approved the <br /> workplan 9 July 2004. Due to site access concerns, only a portion of the original workplan scope of <br /> work was completed during the current investigation. <br /> Six of ten soil borings and three of five monitoring wells originally proposed were completed. None of <br /> the five step-out contingency borings were completed. According to the analytical results, it appears the <br /> lateral extent of impacted groundwater was not delineated downgradient (east-northeast) of the site. <br /> TPH as diesel (TPH-d)concentrations of 560 micrograms per liter(µg/L) and 660 µg/L in grab <br /> groundwater was reported in downgradient borings SB-23 and 24, respectively. <br /> Review of the data indicates that the remainder of the scope of work outlined in the July 2004 workplan <br /> should be completed as proposed with one exception: groundwater sampling and monitoring(both Arcos <br /> and Bellini site wells) should be implemented soon. Results of sampling may provide additional <br /> information regarding consideration of the step-out contingency boring locations. <br /> California Environmental Protection Agency <br /> Qi Recycled Paper <br />