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J <br /> PUBLIC riEALTH SERVICES Pa�iN <br /> SAN JOAQUIN COUNTY ?° <br /> ENVIRONMENTAL HEALTH DIVISION y <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> Q 'o L• , <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 952� " �' <br /> 209/468-3420 <br /> MAILED JAN 2 51996 <br /> JAMES M LANGSTON <br /> PO BOX 97 <br /> LATHROP CA 95330 <br /> RE: LANGSTON"S ARCO SITE CODE: 1503 <br /> 15615 South Seventh Street <br /> Lathrop, CA 95330 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) has reviewed the <br /> "Workplan Phase II Lateral & Vertical Extent of Second Aquifer, Revised" dated January 10, 1996 as submitted <br /> by WHF, Inc. and has the following comments. <br /> The four monitoring wells currently on and off-site were installed in September 1995 and to date, only one <br /> groundwater monitoring quarterly report has been submitted to PHS-EHD for review. Monitoring wells MW-2, <br /> MW-3, and MW-4 were non-detect for all constituents tested. No groundwater data for monitoring well EW-I <br /> was available in this report. <br /> Monitoring well EW-1 is considered by PHS-EHD to be a very important well. Its location is immediately <br /> down gradient to the former underground tanks and it is located in soils that could not be removed by the recent <br /> over-excavation. Groundwater data from this well is very important and the well must be able to provide <br /> repeatable sampling events and be constructed in a way that provides at least the minimum purgable amounts <br /> (three to five casing volumes) and recharge parameters (80% of depth to water within one hour after purging). <br /> If efforts to bring this well into minimum standards are not met, the well will be considered improperly installed <br /> and must be replaced under a permit issued by PHS-EHD. <br /> Without multiple and acceptable groundwater sampling events from EW-I, PHS-EHD has concluded that a <br /> second aquifer investigation is not warranted at this time. Your proposal to place three second aquifer wells is <br /> denied. <br /> You are hereby directed to continue to quarterly sample all four monitoring wells and submit a Quarterly <br /> Monitoring Report to PHS-EHD prior to the next sampling event. As repeatable sampling data indicates and <br /> when you can support conclusions that a second aquifer investigation is warranted, PHS-EHD will evaluate a <br /> proposal to place deeper wells. <br /> Please direct any questions you may have to Michael Infurna at (209) 468-3454. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Michael Infurna, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MI <br /> c: WHF - Lee Delano <br /> c: CVRWQCB - G. Boggs <br /> c: SWRCB Clean Up Fund - A. Mackey & G. Lockwood <br /> A Division of San Joaquin County Health Care Services <br />