Laserfiche WebLink
20-01. These additional investigations are necessary to planA remediation <br /> efforts and to assess future potential impacts on California Water Service <br /> Well 20-01. <br /> Hargis & Associates, Inc. . will conduct the Phase IV groundwater <br /> eampling personnel have been <br /> assessment. MCTC will notify DOHS <br /> when Hargis <br /> identified. Subsurface investigation will begin by determining the zones <br /> u� to CWS <br /> in the aquifer that are contributing groundwater containing <br /> riesch t Of monitor <br /> Well 20-01. This may be accomplished by constructing <br /> wells adjacent to GWS Well 20-01. It is anticipated that the completion <br /> intervals of these nested monitor wells will be 120 ffeetto608 ls, and feet <br /> on <br /> land surface (bl.s) , 180 feet to 220 feet ble. 220 <br /> feet to 260 feet to 300 feet ble. Wells will be constructed <br /> , sampled and analYwed <br /> in sequence until the deepest well contains no chromium. Other e sial <br /> methods of well construction and sampling <br /> will be const <br /> as an <br /> alternative to construction of a nest of wells for determining the zone Welf <br /> contribution. Once the zone that is contributing chromium <br /> to 20-01 has bp determined through laboratory analysis of water samples <br /> collected from the nested wells or alternative special wells, additional <br /> M <br /> in the zone identified. These wells <br /> monitoring wells will be completed <br /> will serve to determine the extent of water containing chromium betwflen <br /> CWS <br /> Well 20-01 and the existing monitor wells, and determine whether there has <br /> been any migration of chromium beyond CWS Well 20-01. The approximate <br /> pproimat actual <br /> locations for these recommended wells are shown on Figure <br /> locations will depend on finding suitable locations accessible to the drill <br /> t;-of-way of the County streets <br /> ria in the righ . <br /> E <br /> 1 The construction of the proposed monitoring wells will depend on the depth <br /> i <br /> of the screened integrals and the formations encount is anal �tablisthet <br /> by the well nest in the area of GWS Well 20 01 <br /> construction will be similes' to that of the intermediate wells and deep <br /> F wells constructed during the Phase III groundwater assessment conducted by <br /> Fargis & Assoc iates, Inc. This .constriction was Presented in a previous <br /> wort: plan approves h`1 MHS in ,7anuary 1965 and is illustrated on "igu*,'-= <br /> 4-4. The wells Will first be drilled to a depth approximating the top .. of <br /> 4-3 <br />