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Stantec Consulting Services Inc. Sta ntec Ran Kilgore Road Suite 100 Rancho Cordova CA 95670 Tel:(916)861-0400 Fax(916)861-0430 January 17, 2014 Mr. Roberto Cervantes Central Valley Regional Water Quality Control Board 11020 Sun Center Drive#200 Rancho Cordova, California 95670 RE: Vapor Intrusion Contingency Plan Former Tidewater Service Station Parcel 2A-L&M Operable Unit 666 West Weber Avenue Stockton,California 94030 Dear Mr. Cervantes: Stantec Consulting Services Inc. (Stantec), on behalf of the Chevron Environmental Management Company and Phillips 66, is submitting this Vapor Intrusion Contingency Plan to be followed in the event measured soil gas vapors exceeding environmental screening levels are observed in APSV wells in the Delta View Apartments following shutdown of the remediation systems located at 666 West Weber Avenue in Stockton, CA(the'site'). There are currently six horizontal apartment soil vapor extraction (ASVE) wells screened over five adjacent Delta View Apartment buildings and connected to the onsite remediation system. Each ASVE well has at least one associated apartment soil vapor (APSV) monitoring well located in the vicinity of the respective Delta View Apartment building as shown on Figure 1 and described below. • ASVE-1 is screened across the footprint of the northernmost Delta View Apartment building located adjacent to the site. APSV-2 is the shallow screened soil vapor monitoring well used to assess soil vapor concentrations during operation of the ASVE-1 well. • ASVE-2 is screened across the footprint of the Delta View Apartment building located directly south of the ASVE-1 building. APSV-3 is the soil vapor monitoring well used to assess soil vapor concentrations during operation of the ASVE-2 well. • ASVE-3 is screened across the northern footprint of the Delta View Apartment building located directly south of the ASVE-2 building. APSV-4 is the soil vapor monitoring well used to assess soil vapor concentrations during operation of the ASVE-3 well. • ASVE-4 is screened across the southern footprint of the Delta View Apartment building located directly south of the ASVE-2 building. APSV-5 is the soil vapor monitoring well used to assess soil vapor concentrations during the operation of the ASVE-4 well. • ASVE-5 is screened across the Delta View Apartment building located directly south of the ASVE-3/ASVE-4 building. APSV-7 is the shallow screened soil vapor monitoring well used to assess soil vapor concentrations during operation of the ASVE-5 well. • ASVE-6 is screened across the Delta View Apartment building located directly east of the ASVE-5 building. APSV-8 is the shallow screened soil vapor monitoring well used to assess soil vapor concentrations during operation of the ASVE-6 well. 1