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J MACTE <br /> engineering and constructing a better tomorrow <br /> August 22, 2008- <br /> Mr. <br /> 008Mr.Jeff Wong <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton,California 95202-3029 ,Pip b( , II'Ale <br /> z�°$ <br /> �D <br /> Subject: Workplan <br /> Offsite Investigation <br /> 800 West Church Street <br /> Stockton,California <br /> MACTEC Project No. 408808753,8 01 <br /> Dear Mr. Wong: <br /> MACTEC Engineering and Consulting,.Inc. (MACTEC)is.pleased to present this Work Plan to perform <br /> offsite investigation'at 800 West Church Street in Stockton,California on behalf of The Newark.Group <br /> (the site owners). This Workplan is intended to fulfill the requirements of the San Joaquin County <br /> Environmental Health Department(the County)for obtaining the pertinent drilling permit. The Scope of <br /> work presented in this Work Plan includes the following: <br /> • Offsite investigation north of site boundary to assess if toluene contamination previously detected in <br /> the northwestern corner of the Site has migrated offsite. <br /> • Preparation of a report presenting the results of the offsite assessment. <br /> MACTEC previously conducted investigation activities at the Site in December 2005 to assess three areas <br /> of concern(AOCs; northwest, southwest and southeast corners of site)identified during a Phase II <br /> assessment performed at the Site in August 2005 for a prospective buyer of the Site. <br /> SCOPE OF SERVICES <br /> Field Investigation <br /> Prior to initiating the field work, MACTEC will obtain the required boring permits from the County and <br /> will clear proposed boring locations using surface geophysical techniques to reduce the possibility of <br /> encountering or damaging buried subsurface utilities such as piping or electrical wiring. Because the <br /> proposed borehole locations will be on West Church Street,we have also obtained a City of Stockton <br /> Department of Public Works(DPW)encroachment permit which is attached for your files. <br /> Based on the results of the previous investigation, MACTEC will be installing four offsite borings. Air <br /> knife will be utilized in the top 5-feet of each boring to avoid encountering undocumented subsurface <br /> anomalies. <br /> Each boring location will be continuously cored and logged by a MACTEC field geologist using visual <br /> and manual methods. Soil samples will be screened using a photo-ionization detector(PID)to identify <br /> any samples potentially containing elevated levels of residual petroleum hydrocarbons. MACTEC will <br /> MACTEC Engineering and Consulting, Inc. <br /> 5341 Old Redwood Highway, Suite 300 0 Petaluma, CA 94954 • Phone: 707.793.3800 0 Fax: 707.793.3900 www.mactec.com <br />