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SN-111 N../ LIGHT, AIR & SPACE CONSTRUCTION ENVIRONMENTAL SERVICES COMPANY State Contractor's Licensc Numbcr 445403 State EPA R.E.A.Numbcr04072 Ofticc 408-979-0661 uppermost aquifer(see Figures 2 and 3 and Table 1). Groundwater was encountered at depths of about 11 to 12 feet below surface grade and appeared to be unconfined. The October 2008 and March 2009 groundwater elevation contour plots indicate a westerly flow direction at a calculated gradient of about 0.003 (see attached Exploratory Boring Logs and Monitoring Well Details and Figures 2 through 7). 3.0 2000-Foot Radius Well Search LA&S performed a 2000-foot radius search for wells around the project site. The search used the available information from the State Department of Water Resources files to document municipal, domestic, agricultural, industrial and other wells. The information is compiled into a summary table together with a map showing selected well locations within and near search radius (see Figure 1 and Table 2). The mapped well locations are approximate and based upon the information on the individual well log. In some cases the well location, logging and well construction information may not be precise or may be incomplete as reported on the state well completion reports. Groundwater monitoring wells installed for regulatory compliance issues are not plotted on this search. The well search showed revealed numerous domestic and irrigation wells in the radius mostly clustered near the site area and in the more developed portion of Manteca. Several domestic wells occur near to the site and one domestic drinking water well used on the subject site at 19589 McKinley Avenue. A brief review of well logs indicates that the depth of the screened intervals of most of these irrigation and domestic wells is below about 75 to 100 feet or deeper, and most wells have annular sanitary seals of about 20 to 50 feet. Based on this available well screen information, the off-site domestic and irrigation wells in the region appear to be screened below the uppermost aquifer sampled for this study. The on-site drinking water well is located inside the small garage next to the residence. No log or well construction information was available for the on-site residence drinking water well and no problems have been reported for this well. LA&S collected a sample from this well in October 2009 for chemical analysis and that data showed that contaminants were not detected. Page 4 of 16 MAIN OFFICE • 1707 LITTLE ORCHARD STREET,SUrM A •SAN JOSE•CA•95125 MAILING ADDRESS•P.O.Box 36303•SAN JOSE•CA•95158-6303•4081979-0661 •408/979-0621 FAX•LASCONST@a AOL.COM E-MAIL GENERAL AND ENGINEERING CONTRACTOR•HA7.ARDOUs SUBSTANCE REMOVAL CONTRACTOR•SITE ENVIRONMENTAL ASSESSMENTS WETLAND AND RIPARIAN HABITAT-ASSESSMENT-DESIGN-RESTORATION-CONSTRUCTION-MITIGATION MONITORING