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WORK PLANS_FILE 1
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WORK PLANS_FILE 1
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Last modified
3/9/2020 11:24:52 AM
Creation date
3/9/2020 9:59:26 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
WORK PLANS
FileName_PostFix
FILE 1
RECORD_ID
PR0545428
PE
3528
FACILITY_ID
FA0005487
FACILITY_NAME
MARCIS DIESEL SERVICE
STREET_NUMBER
2969
STREET_NAME
LOOMIS
STREET_TYPE
RD
City
STOCKTON
Zip
95205
CURRENT_STATUS
02
SITE_LOCATION
2969 LOOMIS RD
P_LOCATION
01
P_DISTRICT
001
QC Status
Approved
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EHD - Public
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Cre0bg!aI7-akX1aIIu. `""� Page 4 <br /> B ioventing/B iosparging <br /> Pilot Test Work Plan <br /> Project No. 770.2 <br /> June 9,2006 <br /> Tables 1 & 2 in Appendix A contain the groundwater elevations and gradients recorded for <br /> the water table and deep wells, respectively. Table 3 includes the well construction details. <br /> 2.3 Contaminant Distribution <br /> Tables 4 through 8 in Appendix A contain the site's historical soil and groundwater data. <br /> Figures 7 and 8 illustrate the soil and groundwater contaminant distribution as superimposed <br /> on the two cross-sections A - A' and B —B', respectively. The data from the March 2, 2006, <br /> groundwater monitoring event and the October 2005 CPT boreholes are presented in the <br /> diagrams adjacent to the respective well's screened interval. <br /> 2.3.1 Soil <br /> i <br /> In Figure 7, a column of soil contamination is present under the former UST X46 <br /> excavation/dispenser area. In the vicinity of MW-6/MW-106, no soil contamination was <br /> detected and Wm. Hunter & Associates stated no contamination was present in MW-3. GTI <br /> previously suggested that the contamination migrated downward to impact the groundwater <br /> without less permeable soil layers causing lateral disperr�s�}i�g,n higher in the column. With the tII <br /> addition of the CPT data, there is a small amount�lo"�'PH-D at 50 feet bgs in CPT-2, but S9'0 �., <br /> clean soils are above and below at 40 and 65 feet bgs, respectively This contradicts our �`►'�; <br /> earlier interpretation. In Figure 8, a similar situation is present. A "stringer" of laterally <br /> displaced TPH-D is evident in MW-104 at 55 feet bgs. However, it is noted that this depth is <br /> within the historical range of groundwater fluctuations and could be caused by water <br /> transport. , <br /> The field geologist noted a strong HC odor at 40 feet bgs� d a free product interface at 45.5 <br /> feet bgs in boring MW-7. The soil concentration of Munig/kg TPH-D @ 45 feet bgs <br /> corroborates with the free product noted at this depth. It is likely that the geologist had <br /> encountered non-aqueous phase liquids (NAPLs) entrained in the silty soil. TPH-D was <br /> detected in soil at 55 feet at a concentration of 12,200 mg/kg, then attenuating to 331 mg/kg <br /> at 70 feet bgs. Once reaching the groundwater table the diesel contamination spread laterally <br /> with the rise and fall of the groundwater table. <br /> 2.3.2 Groundwater <br /> As stated above, Figures 7 and 8 illustrate the October 2005 CPT data and the March 2, 2006 <br /> monitoring event groundwater contaminant distribution as superimposed on cross sections A <br /> - A' and B — B'. The groundwater data are presented in the diagrams adjacent to the <br /> respective well's screened interval. <br /> The TPH-D distribution in the shallow wells is illustrated in Figure 9. Well MW-5 continues <br /> to contain the highest concentrations of detected contaminants. It has not been identified as <br /> y, s <br /> V <br />
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