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PUBLIC HEALTH SERVICES uio"SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISIONKaren Furst, M D , M PH , Health Officer304 East Weber Avenue, Third Floor - Stockton, CA 95 2 <br /> 2091468-3420 %�p Py <br /> JOHN rARGOWSKI AUG 12 1998 <br /> WICKLAND OIL <br /> PO BOX 13648 <br /> SACRAMENTO CA 95853--4648 <br /> RE Wickland #R603 (former Regal Station) SITE CODE 1211 <br /> 6425 Pacific Ave <br /> Stockton, CA , 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS-EHD) has reviewed the Western Geo-Engineers' July 9, 1998 "Request for <br /> Closure Review with Update Status Report#52, May 1998 Quarterly Report" <br /> received on July 13, 1998 and discussed the site with Mark List of the Central <br /> Valley Regional Water Quality Control Board (CVRWQCB) <br /> Although much work has been done at this site, the high levels of petroleum <br /> remaining in the groundwater at MW-2 (TPH-G at 17,000 ug/l and Benzene at <br /> 140 ug/1) will require continued groundwater remedial efforts until lower <br /> concentrations of petroleum are achieved <br /> The CVRWQCB and PHS-EHD feel that remedial activities at this site are <br /> effective and are showing a marked decrease in the impact to the groundwater <br /> beneath the site It is unfortunate that the completion of the remediation has not <br /> coincided with the ending of the lease Lincoln Properties currently holds for this <br /> site When it can be shown that remediation is no longer effective in reducing <br /> the petroleum concentration, PHS-EHD will consider site closure <br /> Reports submitted to PHS-EHD are to have all groundwater data (tables, iso- <br /> concentration maps, etc) reported in "ug/I" (ppb) The iso-concentration maps <br /> included in this Closure Report Request showed the groundwater plume <br /> rnnrcnfr7ttnnc of TPH-(� nnri Ron7ano Irl "nnm" Imn1h an[t tPnriPrl to miglinq i tht— <br /> vv........... .... _ -. - -- -- - r-r- % 17 1 -- - -- --- -- - --- - - <br /> overall interpretation of the groundwater problem Please update these figures <br /> and diagrams before submitting any groundwater evaluation report <br /> Currently the depth to groundwater is at its highest level since the site <br /> investigation began All but one of the existing monitoring wells (MW-10), which <br /> is used for vapor extraction, have "drowned" screened intervals If this poses a <br /> problem with the soil vapor extraction (SVE), adequate steps should be taken to <br /> either modify the system or install additional vapor extraction wells so that the <br /> required remediation can proceed <br /> A Division of San Joaquin Counry Health Care Services <br />