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PUBLIC HtALTH SERVICESFIL <br /> Qu Py <br /> SAN JOAQUIN COUNTY z: <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 /> 209/468-3420 <br /> ARTHUR L WYATT JR MAR 2 3 2001 <br /> 6265 CROOKED STICK <br /> STOCKTON CA 95219 <br /> RE: FORMER ARCO AM/FM SITE CODE: 1216 <br /> 4511 PACIFIC AVENUE <br /> STOCKTON CA <br /> As a measure to control the migration of the MTBE and petroleum hydrocarbon <br /> contamination plume in groundwater at the site, a groundwater extraction remediation <br /> system was proposed in Work Plan Addend=forDissoudMTBE PimmDelirmtzonand Ink-nr n <br /> Gn*oxl Water Rw diation dated October 26, 2000 prepared by Advanced GeoEnvironmental, <br /> Inc. (AGE). The work plan was subsequently approved by San Joaquin County Public <br /> Health Services,Environmental Health Division (PIS-EHD) on October 26, 2000 with the <br /> condition that a full pump test must be performed to estimate hydraulic conductivity, <br /> transmissivity,storativity, and ground water velocity. <br /> In a conversation with AGE at the site during the installation of Extraction Well# 1 on <br /> March 20,2001,PHS/EHD verified that the pumping test has not yet been performed to <br /> date. PHS/EF D requires a full constant rate, ground water pumping test of at least 12 <br /> hours minimum in duration, and the submission of the results of the pumping test including <br /> the estimated radius of influence,before installing the groundwater system- <br /> The pumping test has been tentatively scheduled by AGE for March 27,2001. Given the <br /> high concentration of contaminants in groundwater,the soluble nature of the MTBE, and <br /> the presence of the highly porous sand strata where the contaminants are found,it is <br /> absolutely essential that measures to control the migration of the plume be implemented as <br /> soon as possible. The pumping test should not be delayed,please ensure it is performed on <br /> the above scheduled date. <br /> If you have any questions,please feel free to contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran,REFIS,Director <br /> Environmental Health Division <br /> effre �: Sr. RENS Margaret gorio,SupervtsJfng RENS <br /> y g <br /> LOP/Site Mitigation Unit IV Site Mitigation Unit <br /> c: RWQC B, Central Valley Region-Marty Hartzell <br /> c: Advanced GeoEnvironmental,Inc.- Tim Cuellar <br /> A Division of San Joaquin County Health Care Services <br />