Laserfiche WebLink
20-01. <br /> These additional, investigations <br /> k efforts and to a are necessary toplan/1 remediation <br /> assess future Potential impacts on Ca;Well 20-01. ifornia Water Service <br /> Hargis & Associates, Inc. , will <br /> conduct the phase IV <br /> assessment. groundwater <br /> MAC will ratify DOHS when o <br /> identified. Hargis Oampling personnel have been <br /> I Subsurface investigation will begin by determining <br />� in the aquifer that are Contributing the Zones <br /> t Well 20-01. e groundwater containing chromium to GWS <br /> This may be accomplished by constructing a nest of monitor <br /> wells ad,)acent to CWS Well 20-01, It is <br /> intervals of these nested monitor wells will beci20�� t �e completion <br /> land surface (bl:) , 180 feet to 220 feet bls, 220 feet 6080 feet .below <br /> 260 feet to 300 feet bls. feet bls, and <br /> Wells will be constructed, sampled and analyzed <br /> in sequence until the deepest well contains no <br /> methods of well construction and s chromium. Other special <br /> alternative to construction of a nest that is of ells for determining consideredin�g the zone of <br /> as <br /> an <br /> contribution. puce the zone r° � <br /> contributing chromium to CWS Well i <br /> 20-01 has been determined through laboratoryQ <br /> collected from analy.,is of water samples <br /> the nested wells or alternative special wells, additional <br /> monitoring wells will be completed in the zone identified. These wells <br /> Will serve to determine the <br /> extent of water containing chromium between CWS <br /> Well 20-01 and the existing monitor Wells, and determine whether there <br /> has i <br /> been any migration of chromium 1.- <br /> beyond CWS Well 200 ' <br /> y The approximate � <br /> locations for these recommended wells are shown on Figure 4-3. The actual <br /> locations will depend on finding suitable locations accessible to the drill <br /> i <br /> rig in the rights-of-way of the County streets. <br /> r <br /> The construction of the Proposed monitor <br /> - ing wells will depend on the dept <br /> of the screened intervals and the formations encountered ase`�fa <br /> by the well nest in the area of CWS Well 20-01. anticipated <br /> i " . d that ed <br /> hatt <br /> construction will be similar. to that of the intermediate well�d t <br /> deep <br /> welly constricted during the Phase III groundwater assessment conducted by <br /> Wgis & Associates, Inc. This construction waspre..4 <br /> lr ented in a previous <br /> wor ' <br /> Plan approved by LOHS in ,January 1985 and is illustrated on Figure <br /> ` 4--4• The wells will first bedria <br /> lled to ,a depth approximating the top of <br /> C STz <br /> 4-8 � - <br />