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- h'q KLEINFELDER <br /> ATTACHMENT A <br /> SCOPE OF WORK <br /> Workplan <br /> Limited Soil Assessment and <br /> Sludge Removal and Disposal <br /> Septic System, 1444 E. Mariposa Road <br /> Stockton, California <br /> r INTRODUCTION <br /> L <br /> Kleinfelder is pleased to present this Workplan to Mr. William R. Lewellen, Jr. of Northbrook <br /> Properties. This Workplan was developed based upon our current understanding of site <br /> conditions and correspondence. Kleinfelder is committed to providing quality service to our <br /> clients, commensurate with their wants, needs and desired level of risk. If a portion of this <br /> r proposal does not meet your needs, or if those needs have changed, Kleinfelder will consider <br /> appropriate modifications subject to the standards of care to which we adhere as professionals. <br /> Modifications such as changes in scope, methodology, scheduling, and contract terms may result <br /> in changes to the risks assumed by you our client as well as adjustments to our fees. <br /> BACKGROUND <br /> Kleinfelder was contacted to present a cost estimate to assess the subsurface soils located at 1444 <br /> East Mariposa Road, Stockton, California (Plate 1). The property had previously been owned or <br /> operated by US Rentals. The assessment was requested as a recommended step from the EHD. <br /> It appeared that EHD had concerns that the septic system on site had received waste water <br /> generated from storm runoff and/or steam cleaning activities conducted by the former property <br /> owners/occupants. A site visit revealed that the septic tank appeared to not be serviceable any <br /> longer and has been paved over with asphalt or concrete. <br /> EHD had expressed interest in investigating the soils from near and beneath the septic tank and <br /> L the seepage pit. Information gathered from the permit to construct the septic system at the site in <br /> i <br /> 1970 reveals that the septic system was constructed with a single precast concrete 1,200 gallon <br /> tank, and .90 foot long leach line (18 inches deep) leading to a 25 foot deep, 33 inch diameter <br /> gravel packed seepage pit. Additionally, EHD will require that the septic system be evaluated <br /> and returned to a serviceable status. <br /> Kleinfelder arranged for the top of the septic tank to be uncovered and found the tank to be in <br /> sound condition. A single sludge sample was collected from inside the tank and submitted for <br /> laboratory analysis. The sludge sample was analyzed for total purgeable petroleum <br /> hydrocarbons as reverenced to gasoline (TPH-g), total extractable petroleum hydrocarbons as <br /> referenced to diesel (TPH-d), and total recoverable petroleum hydrocarbons as referenced to oil <br /> and grease (TRPH). The laboratory results showed a concentration of TPH-g - 26 mg/kg, TPH-d <br /> - 900 mg/kg, and TRPH -8,500 mg/kg. Based on the results of the tank sludge sample, a <br /> workplan was requested by the EHD for the further soil and groundwater (if needed) <br /> characterization at the site. EHD has expressed their willingness to allow the septic system to be <br /> 34202.E01 /ST03R1 130 Page 1 of 7 <br /> Copyright 2003,Kleinfelder,Inc. August 8,2003 <br /> L <br />