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Soil Sampling Work Plan Stockton,CA-SJRRC Property Exchange C�) Assessor's Parcel Number 117-09-014 a ntea g ro u p Antea Group Project No. UPR8281A No Further Action letters were issued to AFPC and AMMC on October 28, 2009 and March 31, 2010, respectively (SJCEHD 2009, 2010).Wells which were previously installed on OU-2 were destroyed in January 2010(SJRRC, DTSC 2010). Condor Earth Technologies, Inc. (Condor) produced a Soil Management Plan (SMP) dated May 18, 2010 which outlined health and safety precautions during soil disturbance, waste handling and decontamination procedures for ground disturbance events onsite (Condor 2010). The DTSC approved the SMP in their June 17, 2010 letter (DTSC 2010A). On August 15, 2010, a Land Use Covenant(LUC)was made between the SJRRC and the County of San Joaquin for the collective site due to the presence of antimony, benzo(a)pyrene, lead, dioxins (2,3,7,8-TCDD TEQ), carbon tetrachloride, 1,2-dichloroethane, PCE and 1,3-butadiene remaining in soils above the unrestricted residential cleanup goals on the surface of the property. The LUC restricts land use for residences, school for persons under the age of 21 or a day care center.The property is restricted to industrial/commercial use only. Activities such as raising cattle,food crops or agricultural products, drilling for drinking water,oil or gas without written approval by the Department, or extraction of groundwater except as approved by the Department in a Groundwater Management Plan is prohibited. The LUC also outlined a requirement for annual inspection reports (SJRRC, DTSC 2010). On October 20,2010 the DTSC issued a Remedial Action Certification form for the AMMC(DTSC 2010B). Soil removal activities occurred in OU-1 in 2010 and 2011, but these activities were conducted for construction, and do not affect the proposed property transfer area. The SJRRC completed the first annual inspection for the site on January 5,2012. The SJRRC noted that the teepee structure had been demolished,and that the drainage basin and basement were filled in(SJRRC 2012). In addition to the contaminants listed on the LUC, the DTSC data base, Envirostor, lists formaldehyde and diesel range organics as contaminants of concern (SJRRC and DTSC 2010, Envirostor database). Included in the area of proposed property transfer was most notably a former metal teepee incinerator(Figure 2). According to AMEC's October 6, 2009 report, soil samples collected from this area have not exceeded established RBRGs. Also included on the southern portion of the parcel, near the proposed property transfer area is a former fuel storage and dispensing area, as well as drainage ditches and water basins (unknown locations). Soil samples collected from ditches and water basins have historically contained formaldehyde. 2 www.anteagroup.com