ARCHIVED REPORTS_QUARTERLY GROUNDWATER MONITORING REPORT 1ST QUARTER 2016

Home Browse Search

Quarterly Groundwater Monitoring Report - First Quarter 2016 L&M Operable Unit- West Weber Avenue and North Lincoln Street, Stockton, CA April 29, 2016 • summary of previous investigations. Appendix C contains details of the field and laboratory procedures. Appendix D contains historical on-site remediation system operational and analytical data. Appendix E contains the certified laboratory analytical reports and Stantec Lab Validation Forms for groundwater monitoring and sampling. Appendix F contains Unocal and Morton Operable Unit field data sheets (from Wallace-Kuhl Associates [Wallace-Kuhl]). Appendix G includes groundwater extraction and treatment system laboratory analytical reports, chain-of- custody documentation and product recovery system field data sheets. Appendix H contains the soil vapor point certified analytical report. 1.2 SITE AND SURROUNDING AREA 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 area 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. The UOU was established to direct investigations from West Weber Street south to the former Main Street and from the midline of the former Harrison Street east to Lincoln Street. The UOU includes monitoring wells MW-3, MW-7, MW-37 and MW-38 and environmental monitoring of the UOU is the responsibility of the City of Stockton under a separate MRP. The MOU was established to direct investigations from the middle of the former Main Street down to the southern boundary of Parcel 2A and from the midline of the former Harrison Street east to Lincoln Street. The MOU includes monitoring well 2AMW-15 and environmental monitoring of the MOU wells is the responsibility of the City of Stockton under a separate MRP. Currently, oversight of environmental management responsibilities of the L&M OU is retained by Stantec on behalf of CEMC and P66, and oversight of the UOU and MOU is performed by Wallace-Kuhl on behalf of the City of Stockton. • ® Stantec 2