SITE INFORMATION AND CORRESPONDENCE

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Executive Summary Former OCAMPO PROPERTY 821 South Wilson Way, Stockton, California The former Ocampo Property(OP)site is located at the northeast corner of the intersection of East Taylor Street and South Wilson Way Frontage Road, in the south central portion of the City of Stockton, San Joaquin County, California. The site is currently occupied by an automobile service establishment. On 18 December 1985, a single, steel 550-gallon underground storage tank (UST) was removed from the site. During removal of the UST, petroleum (i.e. gasoline) impacted soil was encountered under the location of the UST at the site. As a result of the impacted soil, the San Joaquin County Environmental Health Department (SJCEHD) issued a directive to investigate the full extent of petroleum contamination for this site. Based on the above SJCEHD directive, a subsurface investigation was performed at the OP site. The investigation included drilling seven (7) soil borings and six (6) groundwater monitoring wells (MW-1 through MW-6) for evaluation of soil and groundwater conditions at the site. Additionally, two (2) vapor extraction wells (VW-1 and VW-2) were installed at the site for evaluating remedial alternatives and to perform interim soil vapor extraction. Based on the recalcitrant nature of petroleum-impact to soil and groundwater at the site, the SJCEHD directed preparation of a Corrective Action Plan (CAP) to mitigate petroleum-impacted soil and groundwater.As part of the CAP, interim soil remediation(soil vapor extraction and air sparging)was conducted at the site between December 2010 and May 2012. Based on the effectiveness of soil vapor extraction and in-situ air sparging performed at the site, a Final Remediation Plan (included in the CAP)was prepared; which proposes to use the currently installed soil vapor extraction and air sparging systems at the site. The proposed air sparging system will be used to inject air into the saturated zone to "strip" hydrocarbons from the groundwater. "Stripped" hydrocarbons are proposed to be removed by the on-site vapor recovery wells and processed through the on-site carbon based soil vapor extraction treatment system. It is estimated that a 12 to 18 month remediation period will be needed to perform the outlined remediation. All hydrocarbon recovery operations will be conducted through above ground, enclosed piping and remediation wells; additionally, all extracted hydrocarbons will be treated through a carbon based vapor recovery system and under permit by the San Joaquin County Air Pollution Control District. Operation of the proposed soil vapor extraction and air sparging systems should not negatively affect public interest or general health and safety.At the conclusions of the corrective action, the OP site conditions should satisfy the California Water Quality Goals, and obtain a 'No Further Action' letter from the California Regional Water Quality Control Board. Advanced GmEnvironmental,Inc.