Laserfiche WebLink
'r V <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> i' Donna Heran,RENS <br /> 600 East Main Street <br /> z Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> • ,,,III y ry 5 Robert McClellan,REHS <br /> Jeff Carruesco,REHS, RDI <br /> •. , .+ <br /> Website: www.sjgov.org/eKasey Foley,REHS <br /> hd <br /> QL`FdR`� Phone: (209) 468-3420 <br /> Fax: (209)464-0138 g�b <br /> July 30, 2010 <br /> Port of Stockton <br /> Mr. Jeff Wingfield <br /> 2201 W. Washington St <br /> Stockton CA 95201 <br /> Subject: UST Site#3 LOP Case #: 1282124 <br /> Port Rd 13 at G St CU F#: 013777 <br /> Stockton, CA 95201 Global ID #: T0607700817 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Updated Site Conceptual Model and In-Situ Chemical Oxidation (ISCO) Pilot Test Work <br /> Plans (SCM-WP) dated May 10, 2010, submitted by your consultant, WGR Southwest, <br /> Inc. <br /> The SCM-WP report covers the installation of six soil borings completed on March 24, <br /> 2010. Only groundwater grab samples were collected during this phase to further <br /> investigate the lateral and vertical extent of the dissolved petroleum hydrocarbon plume. <br /> Included in the report was a work plan to pilot test the remedial action alternative chosen <br /> by WGR (ozone and peroxidelperozone) that was required by the EHD in <br /> correspondence dated December 29, 2009 and conditionally approved pending a <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) Waste Discharge <br /> Requirement (WDR) evaluation. <br /> Chemical analyses of the grab groundwater samples did not detect any significant <br /> concentrations of total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, <br /> ethylbenzene, total xylenes (BTEX), or oxygenated hydrocarbons compounds. WGR <br /> has concluded that petroleum hydrocarbons in the groundwater have been delineated <br /> around the former underground storage tank (UST) area. This, added to conclusion <br /> included in the SCM that the lateral and vertical extents of the soil contamination have <br /> also been adequately delineated, completes the investigative portion for the site. The <br /> EHD concurs that the soil and groundwater plumes have been adequately delineated at <br /> this time. After the remedial phase has been completed, the EHD may require <br /> confirmation soil sampling to be conducted. <br /> Also included in the SCM were two remedial pilot test work plans; the Enhanced Aerobic <br /> Bioremediation Pilot Test Work Plan and the Ozone Pilot Test Work Plan. The overall <br /> remedial pilot test concept is to inject ozone catalyzed by hydrogen peroxide into the <br /> groundwater in the care/source area (RMZ-1) through three new injection points and <br /> also inject compressed oxygen gas through four new injection points in the residual zone <br /> (RMZ-2), just outside of the core area. <br />