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SECOR <br /> International Incorporated <br /> May 10, 1999 <br /> Project 7G600-042-01 <br /> Ms. Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue <br /> Stockton, California 95202 <br /> Re: Addendum to Work Plan for Soil Sampling during <br /> Product Lina/Dispenser Upgrade <br /> ARCO Service Station#4932 <br /> 16 East Harding Way <br /> Stockton, California <br /> Dear Ms. Duncan: <br /> On behalf of ARCO Products Company(ARCO), SECOR International Incorporated <br /> (SECOR) has prepared this addendum to SECOR's Work Plan for Soil Sampling during <br /> Product Line/Dispenser Upgrades, dated April 13, 1999. The purpose of this addendum is <br /> to notify the San Joaquin County Environmental Health Department (SJCEHD) of a <br /> change to the scope of the construction work outlined in the referenced work plan. In <br /> addition to upgrading the product lines, the underground storage tanks (USTs)will also be <br /> replaced. Compliance soil sampling procedures, excavated soil management, limited over- <br /> excavation procedures, and laboratory methods are summarized in the original work plan <br /> with only the following changes: <br /> • The vertical extent of the over-excavation in the area of the USTs will be based on the <br /> limits of the excavation equipment, likely 18 to 20 feet below ground surface. <br /> Over-excavation, if performed, will still be limited to approximately 50 to 200 cubic <br /> yards of soil. <br /> • SECOR anticipates initiating field activities during May 1999. <br /> If there are any questions regarding the contents of this work plan, please call us at (916) <br /> 364-1880. <br /> Sincerely, <br /> SECOR International Incorporated <br /> ROr <br /> E. Benkosky, <br /> Associate Engineer <br /> cc: Mr. Paul Supple, ARCO Products Company <br /> 9912 Business Park Drive, Suite 100, Sacramento, CA 95827 (916)364-1880 (916)364-1889 Fax www.secor.com <br />