SITE INFORMATION AND CORRESPONDENCE

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ENVIROA4ENTAL HEALTH DEPARTMENT OPGI!�.(N C SAN JOAQUIN COUNTY Donna K. Heran, R.E.H.S. Unit Sunervisom :< Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. �� Program Manager Telephone: (209)468-3420 Douglas W. Wilson, RT.H.S. 01 ......... c ��Foa Margaret Lagorio,R.E.H.S. Fax: (209) 464-0138 Robert McClellon, R.E.H.S. Website:www.sjgov.org/ehd/ lett Cay,-uesco, R.E.H.S. 0 2006 DON RODGERS 11900 S UNION ROAD MANTECA CA 95336 RE: The Transmission Shop SITE CODE: 9321 515 Charter Way Stockton CA 95206 San Joaquin County Environmental Health Department (SJC/EHD) has received a request by email from your consultant, The Shaw Group, Inc. (Shaw) to modify the previously approved Addendum to Work Plan for Additional Assessment and Remedial Design for Groundwater, dated August 31, 2005. The modification proposed is to change drilling/field-screening methods. Initially Shaw proposed to use a technique called Ultra-Violet Induced Fluorimetry Cone Penetration Testing (UVIF-CPT). The newly proposed technique is called Membrane Interface Probe (MIP). MIP is applied using direct push drilling, similar to UVIF-CPT. Both technologies generally provide for field screening of subsurface contaminant concentrations during advancement of the boring rods. Shaw is proposing the change in method because the MIP technology provides lower detection limits and would therefore be likely to more accurately define the extent of the subsurface contamination. The proposed depth of the UVIF-CPT borings is 100 feet below surface grade. One of the goals of this phase of the investigation is to define the lateral and vertical extent of the soil contamination at this site. If the MIP technique is capable of reaching the required boring depth, SJC/EHD approves its use at this site. The deadline for the implementation of this phase of work was January 27, 2006. The fee for one of the permits that will be required for this phase of work was submitted on December 29, 2005, though no permit was submitted with it. Please proceed with submittal of all required San Joaquin County Well Permit applications, additional required permit fee of$89.00 and permit inspection fee of$279.00, copies of access agreements or Encroachment Permits necessary for offsite drilling, and with scheduling the approved work. The deadline for implementation of this phase of work is March 13, 2006. Deadline for submittal of a report of findings is May 13, 2006. No further delays, adjustments or addendums to the work plan will be considered. If these deadlines are not met the site may be referred to the Regional Water Quality Control Board — Central Valley Region, or the San Joaquin County District Attorneys Office for enforcement action.