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%two ` t. <br /> �. <br /> SEACOR <br /> SUMMARYOF PROPOSED REMEDIATION A <br /> . G'I1VPI'IES �,..., <br /> 429 West Lockeford Street : <br /> Lodi, California <br /> prepared by: <br /> SEACOR <br /> 100 Pine Street, Suite 2025_ <br /> San Francisco, California `_ ;'_._ • . <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 1960's until their removal in 1987. <br /> At the time of their removal in 1987, soil samples from beneath the USTs were collected and ..= <br /> chemically analyzed. The results of the chemical testing indicated that a release from one or both V <br /> of the USTs 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 /> .Z' <br /> groundwater directly underlying the USTs contains very low levels of gasoline constituents. - 1° <br /> To reduce gasoline concentrations in subsurface soil and shallow groundwater, soil vapor extraction �y ; <br /> is proposed. Soil vapor extraction is a remediation technology applicable to volatile chemical`_ <br /> substances such as gasoline. To extract gasoline from the round, a vapor extraction well will be <br /> g g g P <br /> constructed in the vicinity of the former 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 carbon to remove the gasoline prior to discharge 7 • <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 /> _.z <br /> s <br /> 100 Pine.Street <br /> bjgi+'n y <br /> Sio ire 2025 <br /> Sdn Francisco, CA 94111 <br /> (-i1 5)296-:8 y' <br /> (415) 677-9694 Fkl( <br /> �t�s. <br />