SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

19 April 1997 Ms. Linda Turkatte San Joaquin County Public Health Services Environmental Health Department P.O.Box 338 Stockton, CA 95201-0388 Re: Work Plan Addendum 521 North Cherokee Lane, Lodi, California Site Code: 1324 Dear Ms. Turkatte: Pursuant to our February 1997 conversation, I have prepared a second addendum to the 13 March 1994 work plan. This addendum updates the 1 August 1995 addendum to include tasks which will allow an evaluation of the, 'risk" posed by the gasoline released at this site. Upon your acceptance of this addendum, a cost analysis will be performed; and along with the scope of work, it will be submitted to SB2004 Fund personnel for "pre- approval". Based on the suggested policy of the State Water Resources Control Board (SWRCB) and the data collected thus far, I recommend monitor wells be installed at the apparent perimeter (based on the HydroPunch® data) of the plume. With the exception of MW-1, groundwater at each of the monitor wells will be monitored to allow an assessment of plume stability and biological activity. In order to evaluate 'receptors", a survey of supply wells needs to be performed. Additionally, a health risk assessment needs to be performed. Because of a lack of soil data and model sensitivity, I propose to collect air samples to evaluate potential volatilization exposures. As stated in the 1 August 1995 addendum, I recommend destroying MW-1 as it is no longer serviceable and is apparently well within the groundwater contaminant plume. As it may be possible to use MWA with a vapor extraction system, the destruction should not be performed until after a vapor extraction test at the site. In addition, because the pump island area has yet to be investigated and significant residual soil contamination has not yet been reported at this site, I recommend collecting soil data from beneath each of the pump islands to evaluate potential residual hydrocarbon sources.