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Advanced GeoEnvironmental, Inc . -v--: 14 April 2008 AGE-NC Project No. 01-0839 Ms. Lori Duncan San Joaquin County Environmental Health Department 600 East Main Street Stockton, California 95202 Subject: Interim Soil Remediation Work Plan Addendum -April 2008 ERNIE'S GENERAL STORE 4407 East Waterloo Road, Stockton, California Dear Ms. Duncan: At the request of Mr.Ernest P.Giannecchini of Ernie's General Store,Advanced GeoEnvironmental, Inc. (AGE) has prepared this addendum to the work plan entitled Interim Soil Remediation Work Plan dated 10 May 2007 for 4407 East Waterloo Road, Stockton, California (site). The above referenced work plan proposed the use of soil vapor extraction(SVE)as an interim remedial method for hydrocarbon-impacted soil at the site. The proposed SVE remediation system was a Solleco ECAT 250, which consists of an electrically heated catalytic oxidizer and control components. On 09 April 2008,AGE representatives met with Pacific Gas&Electric(PG&E)site representatives to discuss the electrical service needed to support the ECAT 250 system. The ECAT 250 requires 3 phase, 208/230 volt, 200 amp electrical service, which would require PG&E to install a transformer at the site at the cost of Mr. Giannecchini. PG&E provided an estimate of$20,000 to install the transformer and bring power to the future location of the SVE system and this upgrade would required several months to possible two quarters to undertake. In order to off-set the excessive costs of installing an elaborate electrical service and to expedite the on-site remediation with the ECAT 250 SVE system, AGE proposes to install a TCAT 250 SVE system, which uses a potable and temporary propane gas source to heat the catalytic oxidizer. The TCAT unit is comparable in performance to the EHD-approved ECAT unit and the cost for fuel is comparable to less than the higher electrical cost for the proposed ECAT unit. The TCAT 250 requires single phase(a standard model option),208/230 volt, 100 amp electrical service;TCAT 250 technical specifications are provided in Appendix A. PG&E representatives purported that the site would support the amperage of the TCAT 250 without the installation of transformer at the site or breaking ground to supply additional power to the site. PG&E provided an estimate of$140 and a time line of two weeks for the installation of a secondary electrical meter dedicated to the SVE system at the site. 837 Shaw Road.Stockton.California 95215 Telephone (,209)467-1006 Fax(209)467-1118