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CORRESPONDENCE_2011
EnvironmentalHealth
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CORRESPONDENCE_2011
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Last modified
4/27/2021 2:41:31 PM
Creation date
7/3/2020 11:04:47 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
4400 - Solid Waste Program
File Section
CORRESPONDENCE
FileName_PostFix
2011
RECORD_ID
PR0440003
PE
4434
FACILITY_ID
FA0003698
FACILITY_NAME
CORRAL HOLLOW LANDFILL
STREET_NUMBER
31130
STREET_NAME
CORRAL HOLLOW
STREET_TYPE
RD
City
TRACY
Zip
95376
APN
25303010
CURRENT_STATUS
01
SITE_LOCATION
31130 CORRAL HOLLOW RD
P_LOCATION
99
P_DISTRICT
005
QC Status
Approved
Scanner
SJGOV\cfield
Supplemental fields
FilePath
\MIGRATIONS\SW\SW_4434_PR0440003_31130 CORRAL HOLLOW_2011.tif
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EHD - Public
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0 <br />11 <br />H <br />r <br />L <br />C <br />r <br />C <br />The primary remaining issues to be resolved before an appropriate remedial response can <br />be selected include: <br />• Delineating the extent of groundwater impacts in the shallow, perched aquifer. <br />Determining groundwater flow conditions in the shallow perched aquifer beyond <br />the area covered by the existing monitoring network. <br />As detailed herein, the main thrust of the EMP is to define and characterize the nature and <br />extent of shallow groundwater impact. If impacts are contained within site boundaries, it is <br />likely that institutional and process controls as well as a thorough review and testing of site <br />systems will suffice as the remedial response. <br />The project approach and scope of work described below along with detailed analyses of <br />existing data are designed to provide enough information for this purpose without <br />significantly increasing the size of the monitoring system at the CHSL. A preliminary <br />evaluation of conditions in the project area is outlined in the following paragraphs. <br />2.1 SITE LOCATION <br />The CHSL is located in southern San Joaquin County, south of the City of Tracy (Figure 1). <br />The site address is 31130 Corral Hollow Road, and the landfill is situated southeast of the <br />intersection of Corral Hollow Road and State Route 580. The site occupies approximately 58 <br />acres in Section 18 of Township 3 South, Range 5 East of the Mount Diablo Baseline and <br />Meridian system. The refuse footprint is approximately 44 acres (including recently - <br />discovered refuse outside the closure cap). <br />2.2 SITE GEOLOGY <br />Past drilling and geologic investigations at the site suggest that the CHSL is underlain by <br />recent alluvium, Quaternary stream terrace deposits, and relatively unconsolidated <br />sedimentary rock of the Plio-Pleistocene age Turlock Formation. Lithologies within these <br />three units are similar, and include assemblages of clays, silts, sands, and gravels. The <br />Corcoran Clay member of the Corcoran Formation (also referred to as the Turlock <br />Formation) has been identified in exploratory boreholes drilled around the northern third of <br />the CHSL. The Corcoran Formation is characterized as moderately to highly plastic clays, <br />and mixtures of clay with silts, sands, and gravels. Regionally, the presence of significant <br />clays in the Corcoran Formation allows water to perch on it, though historical groundwater <br />investigations at the site indicate that the shallow groundwater is locally perched on or <br />entrained within these clay units at the site. <br />2 <br />2011-0115 CHSL EMP Workplan Geo -Logic Associates <br />Revision 1- August 24, 2011 <br />
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