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B� Brown and Caldwell <br /> Consultants <br /> 7 7723 S Street <br /> ;acrar nento <br /> alrfomi 95814-7092 <br /> :916444-0123 <br /> ;AX(916)444-8137 <br /> k <br /> f `tea <br /> July 9, 1993 <br /> k <br /> h Mr. Mike Collins r <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 2009 —764-f—I <br /> Stockton, California 95201-2009 <br /> Subject: Work Plan Addendum, Sheldon Oil Company-Stockton Site, <br /> 2210 E. Miner Avenue, Stockton, California <br /> Dear Mr. Collins: <br /> Additional excavation and treatment of soil is required at the subject site. Per the work plan <br /> ` submitted by Kause Construction and Engineering, previous excavation at the site, removed <br /> significant quantities of soil impacted by petroleum hydrocarbons. This soil was placed in <br /> "biocells" and is currently undergoing "bioremediation". Due to the depth of the excavation, <br /> the excavation was stopped at the site prior to'all of the impacted soil being removed. <br /> Hydrocarbon',impacted soil still remains,primarily in the southeast quadrant of the excavation. <br /> It is proposed by this work plan to continue excavation to remove the remaining impacted <br /> soil. Work will continue at the site under the guidelines of the existing Work PIan and the <br /> existing Health and Safety Plan. Please refer to the existing Work Plan for diagrams of the <br /> site. <br /> Additional remediation efforts at the site will consist of the following: <br /> { <br /> • A ramp will be constructed leading into the bottom of the existing excavation from i <br /> ' the west side of the excavation down to about 20 feet belowrade. <br /> g � <br /> • A bench will be developed at the 20-foot level from which excavation work will <br /> continue. <br /> • Excavation will continue in the southeast quadrant of the excavation down to <br /> where visibly impacted soil is no longer apparent or to approximately 45 feet, <br /> whichever comes first. <br /> 4 <br /> Confirmation soil samples will be taken throughout the excavation as per the <br /> existing Work Plan. The samples will be analyzed on a 24-hour turnaround so that <br /> excavation can continue if necessary. . <br /> F <br /> 7OM EPORMWORK-PLN.ADD <br />