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N <br /> DIRECTOR <br /> San Joaquin County Donna Heran,RENS <br /> Environmental Health Department ASSISTANTDIRECTOR <br /> �� CO Laurie Cotulla,REHS <br /> <� 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> N T Carl Borgman, REHS <br /> Mike Huggins,REHS,RDI: <br /> c •x..--..£w'k�P website: www.sjgov.org/ehd Margaret Lagorio,REHS. <br /> qti 9'6 Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS, RDI <br /> Kasey Foley,REHS <br /> PORT OF STOCKTON NOV 0 7 2007 <br /> .JEFF WINGFIELD 1 RITA KOEHNEN <br /> 2201 W. WASHINGTON ST <br /> STOCKTON CA 95201 <br /> E <br /> RE: UST Site #3 Global ID #: T0607700817 <br /> 4 Port Rd 13 at G St RO#: 0673 . <br /> Stockton, CA. 95201 CUF#: 013777 <br /> The San Joaquin County Environmental Health Department (SJ.CEHD).has <br /> reviewed Site Assessment Report Site Conceptual Model Feasibility <br /> Study/Remedial Action Plan dated August 6, 2007.ard-has the following <br /> comments. <br /> This large combination report/study/proposal:included a report of findings from <br /> recently installed soil borings and one monitoring well as well as a - <br /> comprehensive summation of the status of the site since the underground <br /> storage tank (UST) release investigation began. Also included in the submittal <br /> was an evaluation of multiple remedial alternatives and the recommendation to <br /> utilize three methods in a ground water remedial action plan. <br /> On April 19 and 20, 2007 soil borings B3-15 through 133-19 and monitoring well <br /> I MW3-7 were installed to continue the investigation to delineate the lateral and <br /> ` vertical extents of the petroleum fuel impacted soil and ground water plumes. <br /> The combination report concluded"that the limits of the soil contamination <br /> i originally thought to be contained within the limits of the former UST pit extend <br /> outside the pit, as detected in soil boring 63-17. "Although soil contamination was <br /> noted at depths from 10 feet below ground surface ('bgs) to 40' bgs, it appears <br /> that the most intensely impacted soil is present at 20' bgs in saturated clay or- <br /> silty clay around the former UST pit. Your consultant concluded that the area of <br /> the soil contamination was approximately.90 feet by 120 feet in size. The <br /> # elevated contaminant concentrations noted in the ground water samples <br /> analyzed from this boring suggest that the existing network of borings and <br /> monitoring wells do not adequately characterize actual site conditions and. <br /> contamination plumes. <br /> l " <br /> I <br /> i <br />