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-7- <br /> wells in Alden Park are A-zone wells . It also includes proce- <br /> dures for cleaning equipment with solvents. This cleaning will <br /> be done in our laboratories at Richmond; we will not bring sol- <br /> vents to the Alden Park site. <br /> Trees <br /> In the summer of 1988, Chevron planted six trees in Alden Park to <br /> improve the appearance of the park and address concerns that oil <br /> contamination might have been affecting tree growth. Six trees <br /> were planted in specially designed planters which prevented all <br /> contact between oily dirt and the tree roots . Some of the trees <br /> did not grow well . We concluded that some of the trees in the <br /> park are drowning in standing water . We will verify this conclu- <br /> sion and develop a plan to minimize the effects of the standing <br /> water . <br /> It will be necessary to measure the water level in the soil near <br /> the trees . This will be accomplished using soil probes similar <br /> to the ones installed near the bioventing well . With this infor- <br /> mation we will be able to develop recommendations to minimize the <br /> impacts of the standing water . We may also replace some of the <br /> trees in the existing planters . <br /> Removing Oil Seeps <br /> In 1988 six active oil seeps were removed from the area sur- <br /> rounding the park . Small seeps were removed by excavating the <br /> soil and backfilling with clean soil. Seep collection vaults <br /> were installed for larger seeps that might otherwise have <br /> returned after a period of time. The efforts to remove oil seeps <br /> were very successful . We expect that all of the large seeps have <br /> been removed. <br /> There is a small active seep in the sidewalk of Palm Circle east <br /> of Alden Park . We will excavate this seep as part of this work <br /> plan. We will excavate other seeps if they become active. <br /> Excavation will be accomplished by an operator trained in the <br /> excavation of oily dirt . The following procedure will be <br /> followed: <br /> . Appropriate permits will be obtained from the city of <br /> Tracy. <br /> . We will follow the general procedures described earlier . <br /> . The affected area will be barricaded until all work is <br /> completed. <br /> . The seep will be excavated to a maximum depth of 4 feet . <br /> During the excavation, the site will be monitored for <br />