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' k%j KLEINFEL1) ER <br /> 7.1.3 Sensitive Receptor Survey <br />' Four monitoring wells are within a 500-foot radius of the UST They were installed to monitor <br /> groundwater quality in the assessment area One of the monitoring wells MW-1 has had <br /> reported concentrations of petroleum constituents Groundwater samples from one upgradient <br /> and two downgradient monitoring wells were found to be none detect for the requested <br /> petroleum constituents In addition to the four onsite monitoring wells, four "sensitive <br /> receptors" were found within a 2000-foot radius of the UST including three wells and Lodi <br /> Lake The three wells include a General Mills Irrigation Well No 1 and two City of Lodi <br /> Municipal Wells No 's 5 and 7R The nearest point of Lodi Lake was noted approximately 1100 <br /> feet north of the UST area(Plate 4) <br /> Based upon the groundwater data collected and summarized within this report from the four <br /> onsite monitoring wells, it appears the groundwater plume is located in the immediate vicinity <br /> of MW-1 and contained within the perimeter wells MW-2, MW-3 and MW-4 This suggests the <br /> petroleum groundwater plume does not extend greater than 50 feet to the northeast or 150 to <br /> 200 feet to the southwest (down-gradient) Additionally two of the sensitive receptors, Lodi <br /> Lake and Well Number 7R are located up-gradient of the assessment area Well No 7R is <br /> approximately 1,000 feet north of the non-operating UST The nearest point of Lodi Lake was <br /> noted approximately 1100 feet north of the UST area <br /> The remaining two receptors within the search distance include Well No 's 1 and 5 located <br /> cross-gradient to the UST area Well No 5 is approximately 1,500 feet south of the non- <br /> operating UST Well No 1 is a irrigation well owned by General Mills located approximately <br /> 1,100 feet west of the non-operating UST <br /> Based on this information, it is Kleinfelder's opinion that these sensitive receptors have not <br /> been impacted by the former UST operations in the assessment area <br /> 7.2 RECOMMENDATIONS <br /> Based on the data obtained during this assessment, Kleinfelder makes the following <br /> recommendations <br /> 1 Continue quarterly monitoring of the existing monitoring wells (MW-1, MW-2, MW-3, and <br /> MW-4) <br /> 2 Conduct a mass balance calculation of residual petroleum constituents in soil and groundwater <br /> after additional groundwater data is obtained (approximately three quarterly sampling events) <br /> 20-1417-16 E04/ST02R038 Page 15 of 18 <br /> 0 2002 Kieinfelder,Inc June 7,2002 <br />