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ANIL kTJ KLEINFELDER 1 Task 2—Excavation Observation and Soil Sampling Collection ' Kleinfelder will observe the removal of the remnant tank structure and over excavation of nearby soil based on field observations and screening of soil using a Photo-ionization detector (PID). ' The PID will be used in conjunction with field observation as an objective tool to assess the potential limits of soil impacted by petroleum constituents and or volatile organic compounds. ' Because of the relatively high concentrations of some analytes from the soil sample collected in the obviously impacted soil (See Background Section), Kleinfelder recommends selectively placing free product and obviously impacted soil into 55-gallon drums using a shovel. The ' drum/s will be secured, labeled and left of site for potential disposal. At least one 4-point composite sample will be collected of the drummed material. While this will slow the excavation process and create relatively high disposal costs for this selected material, it may 1 ultimately make a difference, such that the remaining stockpiled material will be acceptable to a local Class II Landfill. If the stockpiled material is not acceptable to a Class II Landfill, markedly higher transportation and disposal costs may be incurred. There may be a potential to ' use the stockpiled soil onsite depending upon the sampling results and concurrence by SJC/EHD. The excavated material not drummed will be placed onto and covered by visqueen. SJRTD will 1 provide the backhoe/excavator and operator for the excavation of the tank and soil. Kleinfelder personnel will be present to observe excavation activities, document soil conditions and to collect confirmation soil samples. 1 completion Upon of the excavation activities, based on observation and PID readings, p Kleinfelder will collect a minimum of five discrete confirmation soil samples, one soil sample 1 from the bottom of the excavation and four soil samples from the sidewalls in each compass direction. Kleinfelder anticipates the removal of approximately 50 to 100 cubic yards of ' material. Assuming less than 250 cubic yards of stockpiled material, Kleinfelder will collect one 4-point stockpile soil sample for disposal purposes. Initially Kleinfelder will collect four discrete soil samples from the stockpile which will then be composited into one sample by the analytical 1 laboratory. The number of confirmation soil samples proposed is based on removal of approximately 100 cubic yards of soil. Additional confirmation samples may be requested by SJC/EHD or need to be collected to adequately evaluate potential impact to the bottom and 1 sidewalls of the excavation. The soil samples from within the excavation will be collected from the bucket of an excavator or ' by using a stainless steel core barrel attached to extension rods and a slide hammer. The stainless steel tubes will be removed from the soil and the ends sealed with Teflon tape and tightly fitting plastic caps. The samples will be placed immediately into an iced cooler. The samples obtained will be transported under chain-of-custody control to Kleinfelder's office and then transported by courier in a chilled ice chest to a State-certified analytical laboratory for the requested chemical analyses. The stainless steel hand auger and sampling equipment and tubes will be cleaned between sample locations with a Liquinox® (laboratory-grade detergent) and potable water wash and a distilled 51276/ST05R272/FB:ly Page 4 of 8 ' ©2005,Kleinfelder,Inc. March 9,2005