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h'q KLEINFELDER <br />File No. 23-4800-20.E00 <br />August 26, 1994 <br />SCOPE OF SERVICES <br />Task 1 -Tank Removal and Sampling <br />Kleinfelder will retain a qualified tank excavation contractor who will be responsible for <br />obtaining the excavation permits, properly removing and disposing the USTs, and backfilling <br />both tank excavations according to San Joaquin County Environmental Health Division <br />guidelines. <br />Underpinning of the structure will need to occur prior to the excavation and will either be done <br />by the tank excavator or by a qualified general contractor. Recommendations are given in our <br />Environmental and Geotechnical Assessment report for support of the structure and excavation. <br />Soil resulting from the excavation activity will be stockpiled in an on-site location chosen by <br />San Joaquin County and will be placed on, and covered by plastic sheeting or placed in 55 - <br />gallon drums. Upon completion of the tank removal, the excavation will be backfilled with <br />clean soil and compacted. The backfill soil will be supplied by the excavation contractor, or if <br />available, will be acquired from on-site sources. The excavation can be backfilled with <br />engineered fill, if requested. <br />During excavation of the tank, Kleinfelder will collect and screen the soil in the field with an <br />— organic vapor analyzer to provide a qualitative indication of the presence of petroleum <br />hydrocarbons. The qualitative screening will assist in selecting samples to be submitted for <br />laboratory analysis and in assessing the possible extend of petroleum hydrocarbon migration. <br />A San Joaquin County Environmental Health Division representative will be on site to observe <br />the tank removal and specify the number and location of samples to be collected, and the <br />analysis to be performed. Based on the California Regional Water Quality Control Board's <br />(RWQCB) Leaking Underground Fuel Tank (LUFT) field manual guidelines, we anticipate one <br />_. soil sample will be collected from beneath the norther tank, and one sample from beneath each <br />end of the souther tank for laboratory analysis. The soil samples will be collected from the <br />excavation bottom using the backhoe bucket. In addition, two soil samples will also be collected <br />from the excavated soil to assess the potential concentrations of petroleum hydrocarbons to <br />characterize the soil for possible disposal or remediation. Based on the age and former contents <br />of the two tanks, the five (5) soil samples described above will be analyzed for the following: <br />ETN: and 7E94 <br />Copyright 1994 Kleinfelder, Inc. Page 2 of 5 <br />