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ARCHIVED REPORTS_XR0010336 (2)
Environmental Health - Public
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ARCHIVED REPORTS_XR0010336 (2)
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Last modified
5/21/2020 11:23:19 AM
Creation date
5/21/2020 10:29:27 AM
Metadata
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EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0010336
RECORD_ID
PR0545688
PE
3528
FACILITY_ID
FA0003634
FACILITY_NAME
CANTEEN CORPORATION
STREET_NUMBER
1500
Direction
N
STREET_NAME
SHAW
STREET_TYPE
RD
City
STOCKTON
Zip
95205
APN
14326008
CURRENT_STATUS
02
SITE_LOCATION
1500 N SHAW RD
P_LOCATION
99
P_DISTRICT
002
QC Status
Approved
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EHD - Public
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Procedures <br /> Approximately 5 pounds of contaminated soil was collected from the specified location <br /> and shipped to BioJet Upon receipt of the samples at the lab, BioJet staff combined the <br /> brass tubes from the location to form one composite Once the sample was combined <br /> baseline physicochemistry (nutrient levels) and microbial enumerations were conducted <br /> After the initial baseline testing, liquid nutrients were added to the to achieve <br /> approximately 65 ppm of Nitrate (NO3) The sample was then loosely sealed and <br /> allowed to incubate at room temperature (average temperature 60-65 degrees Fahrenheit) <br /> for a period of 21 days The supplemented studies were analyzed at 4,7,14 and 21 days <br /> Each time samples were collected they were analyzed for the following parameters pH, <br /> Nitrate (NO3), Ammonium (NH4), Phosphorous (PO4), and Potassium (K), and microbial <br /> enumerations, which consisted of General and Selective Enumerations <br /> According to data supplied by AES the sample from VE-1 was sampled at a depth of 25 <br /> feet, Baseline samples showed that nutrient levels were in what would be considered <br /> acceptable ranges especially for Nitrate (see Exhibit 1 for complete results) Nitrate <br /> levels were reported at 27 ppm, however the microbial enumerations were relatively low <br /> with heterotrophic and selective counts of 8 and O1 respectively and only 13% <br /> degraders The low recovery of selective organisms could indicate that there is not <br /> enough contaminant to support large populations at this location Once the baseline <br /> analyses were concluded nutrients were added to the sample to reach approximate levels <br /> of 65 ppm nitrate as well as enhancing the remaining nutrient parameters (NHS, Po&K) <br /> The sample was then loosely sealed and left undisturbed at room temperature (60OF +/- <br /> 50) <br /> At 4 days, the sample was analyzed for both physicochemistry and microbial <br /> enumerations The results showed that nitrate levels had increased to 58 ppm, while <br /> microbial enumerations for general and selective increased to 12 4 and 2 1 respectfully <br /> and 16 94% degraders At 7 days, the results showed that nitrate levels had decreased to <br /> 50 ppm, while microbial enumerations for general and selective increased to 16 5 and 2 4 <br /> respectfully and 14 55% degraders At 14 days, the results showed that nitrate levels had <br /> decreased to 40 ppnn, while microbial enumerations for general and selective increased to <br /> 17 2 and 3 5 respectfully and 20 35% degraders At 21 days, the results showed that <br /> nitrate levels had increased to 42 ppm, while microbial enumerations for general and <br /> selective decreased to 16 9 and 3 2 respectfully and 18 93% degraders These results <br /> indicate that the introduction of the nutrients as a food source may have enhanced activity <br /> for the microbial populations <br /> The remaining physicochemistry parameters remained relatively the same, less then 15% <br /> change over the period of the study (see Exhibit 1), as would be expected since the <br /> uptake of nitrate is the easiest process for the microbes which will later utilize the other <br /> parameters when nitrate levels become limiting Over the course of the study nitrate <br /> levels dropped 28% from baseline, while the general population increased i 1 fold aald <br /> the selective counts increased 320 fold, resulting in an increase of 145 fold in overall <br /> degrader kinetics for the study <br />
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