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FILE COPY <br /> SERVICESPUBLIC H ALTHQUEM <br /> P. . <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION �'. 1 ' ` <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 oq- <br /> �lF0, <br /> 209/468-3420 <br /> DEC 0 6 2000 <br /> PAUL SUPPLE <br /> 1 <br /> ARCO PRODUCTS COMPANY <br /> P ' O BOX 6549 <br /> MORAGA CA 95470 <br /> RE: ARCO Station #6080 SITE CODE: 0712 <br /> 85 Louise Ave. <br /> Lathrop CA 95330 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) <br /> has reviewed the "Quarterly Groundwater Monitoring Report, Third Quarter 2000" dated <br /> November 22, 2000 that was submitted by Delta Environmental Consultants, Inc."(Delta) <br /> on behalf of the above referenced site and has the following comments. <br /> Notations on Table 1, Groundwater Monitoring Data and on the groundwater monitoring <br /> field data sheets indicate that the monitoring wells were not purged to remove the <br /> stagnant water in the well casings prior to collection of the groundwater samples for this <br /> quarter. PHSIEHD has not approved the use of the no-purge method of groundwater <br /> sampling at this site. Both the California State Water Resources Control Board, as <br /> referenced in the Leaking Underground Fuel Tank (LUFT) Field Manuel, and the United <br /> States Environmental Protection Agency recommend that monitoring wells are purged F <br /> until a minimum of three well volumes are removed, or until measured parameters of pH, <br /> temperature and conductivity of the discharged water stabilize to +1-10% over two <br /> successive well volumes. In order to evaluate if the same analytical results are obtained <br /> from samples using the no-purge method and the purge method, ARCO may want to <br /> collect a water sample prior to purging and then after purging from each well, have the <br /> samples analyzed and compare the results. If ARCO can show through several . <br /> sampling events that equivalent results are obtained, PHSIEHD will allow the no-purge <br /> method of sample collection at this site. <br /> If you have any questions or comments please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> W V Gt, U <br /> Lori Duncan, Senior REHS Dot Lofstrom <br /> LOP/Site Mitigation Unit IV Registered Geologist, Unit IV <br /> cc: Marty Hartzell, CVRWQCB <br /> Jay Johnson, Delta <br /> f <br /> A Division of San Joaquin County Health Care Services <br />