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4 u, laze June 9, 2008 San Joaquin County Environmental Health Department 600 East Main Street Stockton, California 9520-3029 Project No.99008-008073.03 Subject: Workplan for Limited Subsurface Investigation 531 Carolyn Weston Boulevard at Manthey Road Stockton, California Dear Mr. Sir or Madam: As requested, Bureau Veritas North America, Inc. (Bureau Veritas) is pleased to present this workplan to the San Joaquin County Environmental Health Department(EHD)on behalf of Evergreen Devoo, Inc. to conduct a limited subsurface investigation (LSI) at the above-referenced subject property. This proposal is based on information presented in Bureau Veritas' Phase 1 Environmental Site Assessment(ESA) (project number 99008-008073.01, dated March 17, 2008). 1.0 INTRODUCTION The LSI scope of work was developed based on a review of the Phase I ESA that was conducted at the subject property. The subject property as shown on the attached Figure 1, includes an approximately 14,000-square foot portion of the central section of a larger 12.93-acre parcel of vacant land that is located in a commercial and residential setting. The subject parcel (APN 164-220-01) is owned by LBUL- Suncal Weston LLC, of Irvine, California. The subject property and larger parcel were depicted as vacant land on a 1913 topographic map. Aerial photographs show the subject property being used for orchards and row crops from 1957 through 1982, and as vacant land from 1993 to the present. The purpose of the scope of work was to evaluate the following recognized environmental condition (REC) that was identified in the Phase I ESA: • North Adjoining Former Landfill—An inactive landfill is present immediately north of the parcel of which the subject property is a portion (approximately 1,000 feet north of the subject property's northernmost boundary). The landfill is unlined and accepted municipal waste beginning in the 1920s or 30s, and later accepted landscape waste, until 2006, when it became inactive. The landfill is in post-closure monitoring mode, which is a standard 30-year process for landfill closure. Low concentrations of Freon 12 have been detected in soil vapor at monitoring points approximately 50 and 100 feet from the subject property; the maximum concentration detected was 0.78 parts per billion. The RWQCB expects the current low concentrations of VOCs in groundwater and soil vapor to continue to decline; however, it is known to be difficult to predict the future behavior of landfill leachate and soil vapor. Mr. Atkinson indicated that the French Camp Slough waterway appeared to be acting as a barrier to the spread of the currently detected low concentrations of groundwater contamination; however it may not act as a barrier to the spread of soil vapor issues. Therefore, it appears the subsurface vapors from the landfill have the potential to eventually migrate to the subject property and therefore, this finding is considered a recognized environmental condition. Bureau Veritas North America, Inc. 14eo1110,Safr1)ne.d Ee,e,, wal Senues Main:(925)426.2600 6920 Kull Center Pukway,Suite 216 Fzc: (925)426.0106 Pleasanton,Cafitomia 94566 wa�.us.bureauventas.r.