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r , <br /> 01, �93111�1 crIex ger rr Woodwar-Clyde Consultants <br /> tO P�mcl l,,,cnuc <br /> Wa1nui Creek. CA 94506 <br /> n,-gas 3c00 <br /> May 6, 1985 <br /> 90163A <br /> Mr. Ron Quick <br /> LOF Glass <br /> P.O. Box 128 <br /> Lathrop, California 95330 <br /> Subject: Results of Investigation of Subsurface Oil Spill <br /> Dear Ron: <br /> This report summarizes our investigative activities to date concerning <br /> the subsurface oil spill at the LOF Glass facility in Lathrop. Included <br /> in this report is a description of the activities conducted at the <br /> facility and a summary of our conclusions on the current status of the <br /> spill and recommendations for additional work. <br /> Introduction <br /> On January 24, 1985 a rupture occurred in a buried 6-inch oil pipeline <br /> connecting storage tanks at the rear of the facility to the manufacturing <br /> processes within the LOF plant. This resulted in the loss of an estimated <br /> 9,000 gal of light manufacturing oil to the subsurface environment. The <br /> oil apparently spread through the soil in the vicinity of the leak and <br /> penetrated vertically to groundwater situated approximately 8 to 9 feet <br /> below grade. Upon reaching the water table the oil began migrating <br /> laterally along the surface of the water. On January 25 and 26 LOF <br /> excavated several small trenches in the vicinity of the leak with a <br /> backhoe. The trenches were excavated to a depth just below the water <br /> table where material ranging from a slight sheen to obvious oil was <br /> observed by LOF personnel in some of the trenches. It is uncertain <br /> whether the sheens observed were actually related to the spill. The <br /> spill appeared to be migrating in a fan shaped pattern to the south and <br /> west. The westward migration probably resulted from a water table <br /> depression caused by a shallow, process water well to the west of the <br /> leak. Pumping from this well has been discontinued after traces of oil <br /> Consullirg Engineers Geoirois:s <br /> ano Environmrntal Scientists r <br /> Offices.n Other Principal Cities <br />