Laserfiche WebLink
Mr. Sasson '"OW Page 2 <br /> PHS-San Joaquin County <br /> 1. The groundwater is not considered usable. Cal Water is <br /> no longer pumping groundwater from a pumping station <br /> located about 1/4 to 1/2 mile east of the site. The <br /> pumping station #72 has been inactive since 1978. The <br /> reason for discontinuing pumping at the well is poor <br /> water quality influenced by the intrusion of the Delta <br /> salty water and methane gas generated from organic decay. <br /> It was noted by Cal Water that most of the water wells on <br /> the west side of Stockton have been closed because of the <br /> Delta influence. <br /> 2 . The volatile components of diesel (benzene, toluene, <br /> ethylbenzene, and xylenes) have all been reported below <br /> drinking water standards within the Safeway wells. <br /> Diesel has been reported in trace concentrations; there <br /> are no drinking water standards for diesel. <br /> 3 . There are at least three other underground tank sites <br /> within the Safeway area that are undergoing varying site <br /> assessments. one site is located south of Navy Drive and <br /> about two hundred yards from Safeway; two other sites are <br /> located southeast of Safeway. The groundwater flow <br /> direction in the area has been variable and is at a steep <br /> gradient (about 0. 027 ft/ft) . This gradient is unusually <br /> steep and could be influenced by local groundwater <br /> pumping. Until the influence of the steep groundwater <br /> gradient and variable direction can be determined, there <br /> is no reason to consider further site assessments. <br /> 4 . Safeway has no control nor have we contributed to the <br /> coliform reported in the groundwater samples. The <br /> coliform concentrations exceed drinking water standards, <br /> and are indicative of a pathway for which other <br /> contaminants can enter groundwater. <br /> 5. In accordance with State Water Resources Control Board <br /> Resolution Number 92-49, Safeway has used several of the <br /> suggested cleanup and abatement methods (Section III E of <br /> the Resolution) - source removal of the underground tanks <br /> and fuel, excavation and extraction of soils local to the <br /> tank site, and bioremediation of the soils. After source <br /> removal and preliminary site assessment in accordance <br /> with the State LUFT manual, a series of groundwater <br /> monitoring wells were installed by Safeway to monitor <br /> groundwater quality. The reported results indicate that <br /> the groundwater has not been impacted to the extent that <br /> beneficial use of the local groundwater is diminished. <br />