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• JZ-3 KLEIN Ff LDER Each of ten shallow soil samples (alternating 1 and 2 foot depth samples) from the perimeter boring locations will be submitted for chemical analyses, while the deeper 5 foot samples will be put on hold pending the shallow soil sampling results. Because there is already indications of near surface lead contaminations in the proposed six interior locations a total of 12 soil samples will be submitted for analyses including both-the 2 and 5-foot depth samples. The deeper soil samples will be analyzed to assess the potential vertical extent of lead impacted soil. The soil samples will be obtained using a hand auger and slide-hammer sampling device. Hand auguring techniques are less invasive than drilling, and should be sufficient for the shallow sampling depths proposed. The hand auger will be used to advance the soil boring to the desired sampling depths. Soil samples are obtained by driving a 2-inch diameter by 6-inch long stainless steel tube into the soil using a slide hammer, forcing soil into the brass tube. The tube is removed from the boring and sealed with Teflon sheeting and plastic end caps. The samples are then labeled, and placed in an iced cooler pending transportation to the analytical laboratory under chain of custody protocols. The hand auger borings will be backfilled with the soil cuttings generated during sampling. The possibility exists that hand augering and hand sampling techniques may not be successful due to hardpan soil, gravel, bedrock or peat and that different sampling methods will need to be evaluated at an additional cost. A total of 22 soil samples, one from each of ten perimeter locations and two from each of the six- interior boring locations will be submitted to a state certified laboratory for the following analyses: ➢ Total Threshold Limit Concentrations (TTLCs) for Lead by EPA Methods Kleinfelder anticipates that the total lead concentrations will be elevated in several soil samples and thereby estimates 15 soil samples will need to be analyzed for the following: ➢ Soluble Threshold Limit Concentrations (STLCs) for Lead by EPA Methods The samples will be analyzed on a standard 10-working day turn-around-time (TAT) for completion. An accelerated TAT can be conducted at an additional cost. Please note additional analyses may need to be conducted to assess the limits of potential lead impacted soil. Task 5—Reporting Upon completion of the field activities and receipt of the analytical results, a report of findings will be prepared for client and agency review. The report will include: • A description of the field activities, observations, and protocols, • Lithologic logs, well construction diagrams, DWR well completion form, 42162.E01 /STO4PI41 Page 6 of 9 Copyright 2004,Kleinfelder,Inc. March 30,2004