COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

L & M OPERABLE UNIT- THIRD QUARTER 2014 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT Introduction October 31, 2014 1.0 Introduction On behalf of Chevron Environmental Management Company (CEMC) and Phillips 66 (P66), Stantec Consulting Services Inc. (Stantec) has prepared this report in accordance with the Regional Water Quality Control Board - Central Valley Region (RWQCB-CVR) Monitoring and Reporting Program (MRP) No. R5-2012-0805 (Appendix A) for the L&M Operable Unit (OU) located adjacent to and along the eastern boundary of the Delta View Apartments (802 West Weber Avenue) and west of the North Lincoln Street and West Weber Avenue cross road in San Joaquin County, California (the "Site"; Figure 1). This report presents a discussion of the Site background, groundwater elevations and analytical results, a summary of remedial activities and soil vapor well sampling results for third quarter 2014 (3Q14), and a summary of the trends of petroleum hydrocarbon concentrations in groundwater. This 3Q14 report describes activities conducted on behalf of CEMC and P66 for the Site. 1.1 SITE DESCRIPTION The Site is currently owned by the City of Stockton, which refers to the Site and surrounding area as "Parcel 2A". The Site currently consists of relatively flat, fallow land and is mostly undeveloped except for the Delta View Apartments located on the western and southern portion of the Site. A State Department of Motor Vehicles (DMV) building resides to the southeast of the Site. The Stockton Deep Water Channel (McLeod Lake), Tuleburg Levee, Weber Avenue, and an office building complex are located north of the Site. The Mormon Slough runs northwest to southeast of the site from the Stockton Deep Water Channel. The Work Net building is southeast of the Site across North Lincoln Street and the Children's Museum is located several 100 meters east of the Site across North Lincoln Street on the south side of West Weber Avenue. During a December 2, 2002 meeting with the RWQCB-CVR, environmental management of the Parcel 2A are was divided into three operable units (OUs): L&M OU; Unocal OU (UOU); and Morton OU (MOU). The L&M OU was established to direct investigations in the area south of West Weber Avenue, west of the midline of the former Harrison Street, east of North Edison, and north of former Main Street (Appendix A). This OU includes monitoring wells MW-9, 2AMW-12 through 2AMW-14, MW-16 through MW-28, MW-31, MW-34, MW-42 through MW-52, and MW-54 through MW-74. The OU also includes dual phase extraction (DPE) wells DPE-1 through DPE-13; the DPE network once included well MW-40 which was converted to a DPE well permanently during the second quarter 2007, but was abandoned during the fourth quarter 2008 due to the City of Stockton's excavation activities at the UOU. The L&M OU Site wells are monitored and sampled in accordance with MRP No. R5-2012-0805. 5 5ta ntec 1.1