Laserfiche WebLink
ovw <br />C A LI FON N IA <br />Water Boards <br />GAVIN NEWSOM <br />GOVERNOR <br />JAR <br />EO BLUMENFELD <br />11C <br />SECRETARYFOR <br />ENVIRONMENTAL PROTECTION <br />Central Valley Regional Water Quality Control Board <br />PUBLIC NOTICE <br />The Central Valley Regional Water Quality Control Board (Central Valley Water Board) <br />invites public comment on a request for regulatory closure made on behalf of the County of <br />San Joaquin Facilities Management Division for the underground storage tank (UST) <br />release at 630 N. California Street, Stockton, San Joaquin County, California (Site). <br />SUBJECT SITE: <br />San Joaquin County Records Center <br />630 N. California Street <br />Stockton, San Joaquin County, CA <br />GeoTracker Global ID # T10000004659 <br />San Joaquin County Case # 0002077 <br />PUBLIC PARTICIPATION COMMENT PERIOD: 20 November 2020 through <br />20 January 2021 <br />CASE SUMMARY: <br />The Site is an active records storage facility in a mixed-use area of Stockton with both <br />nearby commercial and residential property. The Site's UST system consisted of one <br />375 -gallon UST and associated piping. To assess subsurface conditions, soil samples <br />were collected from four borings advanced beneath the Site in May 2011. Soil samples <br />collected from the Site indicated that soil had been polluted by gasoline released from <br />the Site's UST system. The UST system was partially excavated, filled with cement, <br />and abandoned in-place on March 29, 2012. <br />Multiple soil and groundwater samples were collected from across the Site between <br />May 2011 and March 2020 to evaluate and monitor both the nature and extent of the <br />gasoline release, and its potential effect on human health and waters of the state. <br />Active remediation was not necessary to cleanup the Site. Natural degradation has <br />reduced environmental impacts from the gasoline release to levels that no longer <br />threaten human health or waters of the State. The residual gasoline constituents have <br />significantly reduced through natural attenuation, are expected to continue to degrade, <br />and are not expected to migrate beyond their current extent. Petroleum hydrocarbon <br />concentrations in groundwater are expected to reach Water Quality Objectives in 1 to <br />10 years. Natural attenuation has reduced contaminant concentrations in soil by up to <br />99% from historic highs. Residual petroleum hydrocarbons remaining in the subsurface <br />KARL E. LONGLEY SCD, P.E., CHAIR I PATRICK PULUPA, ESO., EXECUTIVE OFFICER <br />11020 Sun Center Drive 11200, Rancho Cordova, CA 95670 1 www.waterboards.ca.gov/centralvalle\ <br />Z1.1 <br />" RECYCLED PAPEP. <br />