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Case Study
[ Confidential Client/Site ]

RWQCB - Santa Ana Region
Groundwater Analytical Results
Scope:
CalClean was contracted to conduct a 24-hour dual phase extraction pilot test for a confidential client located within the Regional Water Quality Control Board - Santa Ana Region.  The subject site exhibited elevated concentrations of petroleum hydrocarbons in the soil and groundwater beneath the site including the oxygenated gasoline additives methyl tert-butyl ether (MtBE) and tert-amyl methyl ether (TAME).

The lithology beneath the site consisted of sand/silty sand (0-15 feet below ground surface [bgs]), clayey silt/silty clay (15-55 feet bgs), and sand/gravelly sand (>55 bgs).  Shallow groundwater was located in a thin saturated zone approximately 24 feet bgs.
Results:
The results of the dual phase extraction pilot test indicated an effective radius of influence of approximately 29 feet.  Approximately 495 pounds of hydrocarbons were destroyed and extracted groundwater was treated utilizing CalClean’s dual phase system and groundwater treatment trailer.  The results of the groundwater samples are presented in Table 1.
Case Study
[ Confidential Client/Site ]

RWQCB - Santa Ana Region
Groundwater Analytical Results - Table 1
Parameter Prior To
Extraction		 After CalClean's
Treatment Process		 Percent
Reduction		 Carbon Polishing
Post Treatment		 Percent
Reduction
MtBE
360,000 µg/L
6,740 µg/L
98%
ND (<0.5 µg/L)
100%
TPHg
228,000 µg/L
11,300 µg/L
95%
ND (<50 µg/L)
100%
TAME
2,590 µg/L
25.3 µg/L
99%
ND (<0.5 µg/L)
100%
Benzene
33,700 µg/L
267 µg/L
99%
ND (<0.5 µg/L)
100%
Toluene
52,700 µg/L
987 µg/L
98%
ND (<0.5 µg/L)
100%
Ethylbenzene
6,580 µg/L
162 µg/L
98%
ND (<0.5 µg/L)
100%
Xylenes
40,900 µg/L
1,497 µg/L
96%
ND (<1.0 µg/L)
100%
Napthalene
10,200 µg/L
147 µg/L
98%
ND (<0.5 µg/L)
100%
MtBE - Methyl tert-Butyl Ether
TPHg - Total Petroleum Hydrocarbons - Gasoline Range
TAME - tert-Amyl Methyl Ether
ND (<0.5 µg/L) - Not Detected Above the Laboratory Reporting Limit of 0.5 µg/L

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