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S E C 0 R groundwater gradient direction within the B monitoring zone at the site has been to the northeast with the gradient ranging between 0 002 to 0 011 feet per foot In the C monitoring zone during the second quarter 2005, the groundwater direction was to the northwest at a gradient of 0 07 ft/ft Historical groundwater monitoring data is included as Tables 3 and historical gradient data is included as Table 4 i A, 24 Supply Well Survey 3 } do According to IT's Site Assessment Report, dated February 25, 2000, a water supply well search K. was performed to locate any water supply wells within 2,000 feet of the subject site Review of ' well logs at the California Department of Water Resources (DWR) indicated the presence of one water supply well within the 2,000-foot search radius, located at 1521 North Hunter Street, downgradient (northeasterly) of the site Well construction details and usage of the well was not ' documented on the DWR well log The San Joaquin County Environmental Health Department (SJCEHD) attempted to locate the well, however, the well was not found Additional well searches conducted in the area (adjacent LUFT site ARCO 4932, 16 East �� ' Harding Way) indicated that 4 wells are located approximately 2,000 feet east ri=F (cross/downgradient) of the site at the Stockton State Hospital, one well is located 2,000 feet � northeast (downgradient) of the site (near Cemetery Lane and Harding Way), and one well is ' approximately 2,000 feet northwest (cross-gradient) at the intersection of Wyandotte and y Commerce (as indicated by SJCEHD in their letter dated November 21, 2000) The use of the 4 wells at the Stockton State Hospital was not indicated on the well logs The well at Cemetery Lane and Harding Way was indicated as industrial use, and the well at Wyandotte and Commerce is owned by California Water Service but is not active The sensitive receptor survey 'fl is presented in SECOR's report Additional Site Assessment Report dated November 9, 2001 for ARCO 4932 A sensitive receptor map is included as Figure 3 25 Summary of Remedial Action Source removal conducted at the site to date consists of over-excavation of obviously impacted f soil during the UST, dispenser, and product line removal conducted in 1999 A total of ^� approximately 1,707 tons of soil was transported off-site for disposal at Forward Landfill in " Manteca, California Historical maps showing areas of over-excavation are included in , ' Appendix B v t 6 S 'P 1 Fah' fM•f �t Updated SCM 2005 doe 5 x" 77CP 64409 05 0045 t zr NF