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PUBLIG-'HEALTH SER CES <br /> . � o <br /> SAN JOAQUIN COUNTY , <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 C (Opy <br /> JAMES GIOTTONINI <br /> PUBLIC WORKS DIRECTOR <br /> CITY OF STOCKTON MAY 0 6 1998 <br /> 425 N EL DORADO ST <br /> STOCKTON CA 95202 <br /> RE: 110 W SONORA ST SITE CODE: 1253 <br /> FIRE STATION#2 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the Fourth Quarter 1997 Status Report for the above referenced site dated February 24, <br /> 1998 prepared by ATC Associates, Inc, and has the following recommendations: <br /> 1) Conduct a one-day vapor extraction test(VET) on the two vapor wells (VW) that currently <br /> have a screened interval above groundwater, VW-1 and VW5-shallow, in order to assess the <br /> feasibility of vapor extraction as a remedial alternative for the contamination in the vadose <br /> zone. Two VETS had been performed previously in September 1992 and again in January <br /> 1994, but static water level has since risen considerably, from approximately 41' below <br /> ground surface (bgs) to 27' bgs. Therefore, a new pilot test and feasibility study is <br /> recommended. <br /> 2) Consider air sparging as a remedial technology for the contamination in the saturated zone. <br /> At present, the results of the lab analyses of the groundwater samples are elevated in the <br /> deeper screened vapor wells which indicates active remediation is necessary. An initial <br /> screening to evaluate the effectiveness of air sparging in conjunction with vapor extraction <br /> should be performed. <br /> 3) Continue quarterly monitoring of all the wells on site. <br /> If you have any questions, please feel free to contact Jeff Wong at(209) 468-0335. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division _ <br /> Jeffrey Wong , EHS, Trainee Margaret agorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> JW:Ib <br /> c: COS Public Works-Jim Escobar <br /> C" RWQCB, Central Valley Region - Pat Anderson <br /> c: Drew Van Allen -ATC Associates Inc. <br /> A Division of San Joaquin County Health Care Services <br />