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� a <br /> SEACOR <br /> SUMMARY OF PROPOSED REMEDIATION ACTIVITIES <br /> -429 West Lockeford Street <br /> Lodi, California <br /> RE E <br /> E <br /> prepared by: DEC 1 .6 19 <br /> SEACOR �` TAL, HEA0H <br /> 100 Pine Street, Suite 2025:�V I Ra NI F <br /> :San-Francisco, California P RNA IT E VICES <br /> Two underground storage tanks (USTs) used to store gasoline were operated at a property located <br /> at 429-West Lockeford Street,in Lodi, California from the early 196.0's-until their removal in.1987. <br /> At the time of their removal in .1987, soil samples from beneath-ibe USTs were collected and <br /> chemically analyzed. 'The results.of the chemical-testing indicated that a release from one or both_ <br /> of the.UST's had occurred. However, the amount.of gasoline.released could not be estimated. <br /> Subsequent subsurface.investigations conducted -in the vicinity of the. UST's indicate that soils <br /> underlying the .UST's have been impacted by gasoline to a depth of approximately 35 feet below <br /> ground, surface., In addition, sampling and chemical. analysis. of groundwater indicates that <br /> groundwater'directly underlying the UST's contains very low levels of gasoline constituents. <br /> To reduce gasoline concentrations in subsurface,soil and shallow groundwater, soil vapor extraction <br /> is proposed.. Soil vapor extraction is a remediation technology'applicable to volatile chemical <br /> substances such as gasoline. To extract gas6line from the ,ground, a vapor extraction well will be <br /> constructed in the vicinity of the formef UST's. An.electrical blower will:then be hooked up to the <br /> well to vacuum extract gasoline.present.in:the subsurface. Air containing gasoline vapors removed <br /> from the ground will-then be treated with activated 0carbon to reinove :the gasoline prior to discharge <br /> to the atmosphere. . The'vapor extraction system will be'operated under a permit from the San <br /> '.Joaquin County Air Pollution Control District. <br /> During and following completion of soil vapor extraction, groundwater sampling and. analysis will <br /> continue on .a quarterly basis. Following completion of vapor extraction, soil samples will be <br /> collected and chemically analyzed to confirm a reduction in gasoline concentrations. <br /> 100 Pine Street <br /> Suite 2025 <br /> San Francisco, CA 94111 <br /> (415)296-7877 <br /> (415)677-9694 FAX <br />