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ARCHIVED REPORTS_XR0013090
EnvironmentalHealth
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EHD Program Facility Records by Street Name
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HOLLY
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20500
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3500 - Local Oversight Program
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PR0541264
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ARCHIVED REPORTS_XR0013090
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Last modified
2/3/2020 10:02:06 PM
Creation date
2/3/2020 9:50:40 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0013090
RECORD_ID
PR0541264
PE
3528
FACILITY_ID
FA0023641
FACILITY_NAME
FORMER HOLLY SUGAR FACILITY
STREET_NUMBER
20500
STREET_NAME
HOLLY
STREET_TYPE
DR
City
TRACY
Zip
95376
CURRENT_STATUS
02
SITE_LOCATION
20500 HOLLY DR
P_LOCATION
03
QC Status
Approved
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EHD - Public
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3.0 CONCEPTUAL SITE MODEL <br /> 3.1 Regional Soil Associations <br /> The area surrounding area is predominately characterized by the following soil association: <br /> • Capay-Stomar-Zacharias Association — Moderately well drained and well drained, <br /> moderately fine textured, gravelly moderately fine textured soils that are very deep; in <br /> interfan basins and on alluvial fans and stream terraces; 0 to 2 percent slopes. <br /> Soils beneath the Site are categorized as Capay clay(USDA, 1988). <br /> • Depth Class: Very deep <br /> • Drainage Class: Moderately well drained <br /> • Position on Landform: Alluvial fans and low stream terraces <br /> • Parent Material: Alluvium from mixed rock sources <br /> • Surface Textural Class: Clay or clay loam <br /> • Slope: Nearly level <br /> 3.2 Site-Specific Soil Characteristics <br /> According K. D. Schmidt and Associates (Schmidt, 1986) the uppermost deposits at the Site are <br /> fine-grained sand with abundant clay and have low permeability. The shallowest permeable <br /> deposits are normally 15 to 30 feet bgs. Monitoring wells installed by HLA indicated clay or <br /> clay-sand mixtures from the surface to 12 to 14 feet bgs (HLA, 1994). The Corcoran Clay <br /> underlies the Site at an estimated depth of 250 to 300 feet bgs. Between these to clay units are <br /> alternating and discontinuous layers of sand, sand-gravel mixtures, clay-sand mixtures, sitly-clay, <br /> and clay. Figure 7 shows lines of section for A-A' and B-B'. Figure 8 shows a cross-section of <br /> the A-A' section and Figure 9 shows a cross-section of the B-B' section. <br /> 3.3 Site-Specific Groundwater Characteristics <br /> The overall flow direction at the Site tends to be to the north-northwest. In the areas of UST A, <br /> UST B, and the Bunker the groundwater flow direction is toward the northeast (Figures from <br /> Minney, 2010 and Minney, 2010b). Between June 2008 and November 2009 the depth to <br /> groundwater in MW-A ranged from 5.79 and 7.22 feet bgs. During the same period the depth to <br /> groundwater in MW-B ranged from 7.88 to 8.75 feet bgs. The depth to groundwater in MW-B is <br /> consistent with Del-Tech field logs dating back to March 2001 and is consistent with data <br /> collected from the replacement well MW-BR. <br /> The shallow groundwater is unusable and untreatable for drinking water and/or agricultural <br /> purposes due to TDS, chloride, nitrate, and sulfate levels exceeding background levels <br /> considered by the State Water Resources Control Board as being usable or treatable to drinking <br /> water standards and/or for the use as an agricultural water supply(Minney, 2010). <br /> - 11 - <br />
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