ARCHIVED REPORTS_XR0009304 - Laserfiche WebLink

Home Browse Search

X11` Geomatrix . Groundwater in the western Stockton area reportedly was used for agricultural water supply in ' the past, most likely when surface water from the San Joaquin River was not available Because agricultural uses of land have almost completely disappeared in western Stockton, ' groundwater in this area is no longer used as a source for agricultural water supply ' Water services to the users in the City of Stockton are provided by OMI/Thames Water Stockton, Inc (OMI/Thames), and California Water Service Company (CWS) The water supply wells operated by OMI/Thames are located at least 5 or 6 miles north and south of the ' Site (OMI, 2003) The water supply wells operated by CWS are located east of Interstate 5 more than 2 miles east of the Site, most of these wells are 500 feet deep and have at least 100 to ' 250 feet of annular seal (CWS, 2003) ' The Port of Stockton has a small supply well near their administration building (approximately 900 feet southeast of or hydraulically cross gradient from the Site) that is used for landscape irrigation (Ross, 1999b) No other current uses of groundwater are known in the immediate area of the Site There are no anticipated uses of the shallow impaired groundwater at the Site in the foreseeable future 4.0 CONCLUSIONS The Site is located within the central portion of the Port, an area of heavy industrial uses There are no current or anticipated future beneficial uses of shallow groundwater in the immediate vicinity of the former UST site Under current conditions, the Site does not pose significant risks to the health and safety of the general public or to ecological receptors ' The best available remedial approach for the Site is implementation of institutional controls Geomatrix recommends that a SMP be developed to provide guidelines for the proper management of impacted soil and groundwater when intrusive activities are conducted at the Site The SMP should include a description of subsurface conditions, guidelines on soil handling, soil disposal, and construction dewatering, as well as the responsibilities for implementation of the SMP The SMP should also require additional evaluation of Site ' conditions should Site use changes in the future Site conditions conform to the RWQCB low-risk criteria Based on this evaluation, the Site ' meets the criteria for closure and should be considered by the EHD for issuance of a NFAR letter , I16000s16437 0001Archive16437-041 doc 10