ARCHIVED REPORTS_XR0006711 CASE 1

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r r 1 2 4 Domestic Water Well Survey, Sampling and Analysis On November 16, 2000, Ramage Environmental published Water Well Survey Addendum, which further identified domestic water wells in the site vicinity, and documented the results of sampling and analysis from 12 domestic water supply wells Ramage Environmental identified a total of 56 domestic water wells along Raylow Avenue and Mylnar Avenue, between East Yosemite Avenue to the south and North Street to the north Between September 12, and November 11, 2000, Ramage Environmental collected water samples from the 12 water supply wells located within 500 feet of the site Between June 5 and 26, 2002, Ramage Environmental re-sampled the four domestic water supply wells located within 200 feet of the site (Figure 3) To date, concentrations of gasoline compounds have not been detected in the on-site water supply well or any of the domestic wells During the second quarter of 2004, the on-site domestic water well was taken out-of-service, and the site was converted to city water service 1 2 5 Monitoring Well Installations and Cone Penetration Testing On January 10, 2001, Ramage Environmental published Environmental Site Investigation Report, which documented the drilling of four on-site cone penetration test (CPT) borings and the 1 installation of four on-site groundwater monitoring wells On July 22, 2002, Ramage Environmental published Status Report, Cone Penetration Testing and Quarterly Groundwater Monitonng, which documented the drilling of three additional CPT borings Based on the CPT soil and groundwater sample analytical results, the lateral and vertical extent of MTBE appears to be defined The monitoring well and CPT boring locations are shown on Figures 2 and 3 On January 24, 2003, Ramage Environmental published Monitonng Well Installation and Groundwater Monitonng Report, Fourth Quarter 2002, which documented the installation of two ' additional groundwater table monitoring wells (MW-5 and MW-6) Based on the groundwater analytical results from the newly-insta#led monitoring wells, the lateral extent of impacted groundwater appeared to be defined on-site The locations of these wells are shown on Figure 3, ithe well construction details are included in Table 1, the cumulative groundwater analytical results for the monitoring well network are summarized in Table 2, and the MTBE concentrations in groundwater are shown in cross-section (Figure 4) 1 i6 r r