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i December 4, 2005 4088053170 01 Mr. Jeff Wong San Joaquin County Page 2 In August 2005,AGI conducted a Phase II assessment which included the advancement of 18 soil borings to assess the soil and groundwater beneath the Site. The results of this assessment identified elevated levels of petroleum hydrocarbons in soil and groundwater in three areas(northwest, southwest, and southeast corners)of the site. SCOPE OF WORK i Field Investigation Prior to initiating the field work,MACTEC will obtain the required boring permits from the Countyji and will clear proposed boring locations using surface geophysical techniques to reduce the possibility of encountering or damaging buried subsurface utilities such as piping or electrical wiring. j Based on the results of the Phase H investigation,MACTEC proposes performing additional investigation of the three identified areas through the installation of 12 additional onsite soil borings as discussed below. All borings will be advanced to groundwater(estimated at approximately 20 feet bgs)using a direct- push drill rig equipped with 1-7/8-inch-diameter,hollow, driveod. Groundwater samples will be E collected from nine of the twelve soil boring locations(as discussed below). Proposed boring locations are presented on Plate 1. r I Each boring location will be continuously cored and logged by a MACTEC field geologist using visual and manual methods. Soil samples will be screened using a photo-ionization detector(PID)to identify any samples potentially containing elevated levels of residual petroleum hydrocarbons. MACTEC will prepare select soil samples for laboratory analysis based on PID measurements and eld geologist. MACTEC anticipates one to two soil die)F Sabo MACTEC 4 0 X00 December 4, 2005 y EIa, Cl, ra l d r�yy�/; 4088053170,01 VICES Mr. Jeff Wong San Joaquin County Environmental Health Department 304 East Weber Avenue, 3rd Floor Stockton, California 95202 Work Plan Additional Assessment 800 West Church Street Stockton, California 95203 Dear Mr. Wong: MACTEC Engineering and Consulting, Inc. (MACTEC) is pleased to present this Work Plan to perform additional assessment at 800 West Church Street in Stockton, California on behalf of The Newark Group (the site owners). This Workplan is intended to fulfill:the requirements of the San Joaquin County Environmental Health Department(the County)for obtaining the pertinent drilling permits. The Scope of work presented in this.Work Plan includes the following: • Additional assessment of areas identified in the Phase II assessment performed at the Site in August 2005 by Advanced GeoEnvironmental, Inc. (AGI)to determine the extent of the identified releases. • Preparation of a report presenting the results of the additional assessment. BACKGROUND f MACTEC conducted a Phase I Environmental Site Assessment(Phase I) for the Newark Sierra Paperboard Corporation(the Site) in September 2004. The Phase I reported that six underground storage tanks(USTs)were removed from the Site in 1986. A tank excavation associated with the former USTs contained stained soils an&odor, and resulted in an unknown amount of soil being excavated from the tank pita Soil and groundwater samples collected during the removal activities contained elevated concentrations of total petroleum hydrocarbons as diesel.(TPHd),benzene, 1,2- dichlorobenzene, 1,4-dichlorobenzene, and toluene. The Regional Water Quality Control Board (RWQCB) concluded that the soil samples collected from the pits and stockpiled soil were not analyzed for the chemicals stored in the tanks or the by-products of those chemicals and recommended additional sampling of native soils: MACTEC Engineering and Consulting,Inc. 5341 Old Redwood Highway;Suite 300•Petaluma;CA 94954_ 707-793-3800•Fax:707-793-3900