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Musco Family Olive Company -2 - 6 March 2008 <br /> The report evaluates the newly installed wells and attempts to categorize the wells into several <br /> water bearing units identified as: the shallow,intermediate, and deep zones beneath the site. <br /> The evaluation in Table 6 of the report is based on chemical concentrations and the Phase l <br /> summaryproposes that high salinity groundwater found in wells MW-2 and MW-25 is mixing <br /> with groundwater encountered approximately 60 to 70 feet above it. The report does not <br /> evaluate the application or storage of process wastewater and its chemical contribution to <br /> groundwater. <br /> The report proposes the Phase II Groundwater Investigation Work Plan will continue to <br /> investigate several hypotheses, further develop the site conceptual model, and determine the <br /> water quality protection standard for the site. The work plan proposes to install monitoring <br /> wells in three study area's shown in the table below. Additional staff recommendations are <br /> also included in the table below: <br /> Study Area Well Type Well Objective <br /> Area 1 —Offsite Well Cluster#1 Shallow/Deep well— Compare offsite GW quality <br /> southeast of site with onsite GW quality <br /> Well Cluster#2 Shallow/Deep well— Compare offsite GW quality <br /> northeast of site with onsite GW quality. start <br /> requests Musco move the <br /> well cluster southeast behind <br /> the Safeway Distribution <br /> Center. <br /> Canal Influence Well Shallow well— Evaluate potential impact of <br /> northeast of Well Cluster#2 leakage from Cal. Aqueduct. <br /> Staff requests Musco also <br /> drill a deep well at this <br /> location. <br /> Area 2-Uplands Well Cluster#3—First Encountered GW Assess DTW; GW quality; <br /> well northeast of 84 M gallon reservoir and supplement stratigraphic <br /> between MW-16 and MW-4 data from Boring#4. <br /> Soil Boring#4 First Encountered GW— Provide lithologic data <br /> 600 feet north of former 1 M gallon pond between MW-4 and MW-8.. <br /> Staff requests Musco build a <br /> well at first encountered <br /> water. <br /> Area 3— Lowland Well Cluster#5 First Encountered GW Expected deep zone well. <br /> 900 feet northeast of well.MW-7 Assess deep GW quality and <br /> elevation <br /> Supplemental Wells High Salinity Deep Wells—PDW1 through Water quality and gradient <br /> Upgradient PDW3 data; potential mixing of <br /> offsite/Swale deep water and shallow GW. <br /> Staff requests Musco drill <br /> PDW#4 in the vicinity of <br /> MW-22. <br />