ARCHIVED REPORTS XR0001513 - Laserfiche WebLink

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' 1 2 4 Installation of Off-Site Monitorin Wells and Sen � �..,_ s tive Receator Surv_ev On January 14, 2002, Ramage Environmental published Status Report, Additional Site Investigation, which documented the installation of four off-site groundwater table monitoring wells and the survey of potential sensitive receptors within 2,000 feet of the site The locations of the four wells (MW-4, MW-5, MW-6 and MW-7) are shown on Figure 3 The well construction details are summarized in Table 1 All of the soil and groundwater samples collected from the four new wells were free of detectable concentrations of gasoline compounds As such, the lateral extents of impacted soil and groundwater at the water table appeared to be defined Impacts to vadose zone soil appeared to be limited to the footprint of the former UST system On-site, the groundwater samples collected from MW-2 and MW-3 continued to contain concentrations of TPH-as-gasoline, BTEX and 1,2-DCA MTBE was not detected in groundwater beneath the site The expanded groundwater monitoring well network indicated that groundwater 1 flow may be toward the east-southeast The plume of impacted groundwater at the water table appeared to extend from the vicinity of the former UST system to the southeast beneath the East Charter Way right-of-way No sensitive receptors located within the site vicinityappeared to be threatened b the pp y gasoline hydrocarbons in soil and groundwater, originating from the former UST system at the site For the site vicinity, one well completion report was on file at DWR Three additional well completion reports were identified immediately outside of the 2,000-foot site vicinity radius The nearest identified water supplywell (approximately 800 feet west of the site was th ( PP Y ) e California Water Service Company Well #50, which has been out of service for several years, but remains open for potential future use The nearest identified active water well was the San Joaquin County Fairgrounds well, approximately 2,100 feet southeast of the site No schools, hospitals, day care centers or other possible sensitive receptors were observed in the site vicinity The nearest surface water body to the site is the Mormon Slough, which crosses the site vicinity approximately 1,000 feet north of the site • 6