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PUBLIC HEALTH SERVICES <br /> SAN IOAQt!IN COUNIN <br /> N: <br /> Jti(,[ Kit ANNA NLD,M P li <br /> I feAth Officer <br /> P.O. Box 2009 0 (I601 East Hazelton Avenue) <br /> • Stock-ton,California 95201 �tfFoar <br /> (209) 469-340(1 <br /> GERALD THIEMANN <br /> 327 BLOSSOM DRIVE DEC 171993 <br /> RIPON CA 95366 <br /> RE: Former Thiemann's Service SITE CODE: 1479 <br /> 106 Second Street <br /> Ripon CA 95366 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has <br /> completed review of the "Site Characterization" report dated September 1993 and prepared <br /> by Aqua Geosciences, Inc. PHS/EHD has prepared the following comments for your <br /> consideration. <br /> The preliminary investigation was initiated in July 1993 to determine the extent of soil and/or <br /> groundwater contamination which resulted from former leaking underground storage tanks <br /> that were removed in March 1991. The investigation included drilling and sampling of eight <br /> soil borings, three of which were converted into monitoring wells. Both soil and groundwater <br /> contamination were evidenced by laboratory analysis of soil and groundwater samples <br /> collected in July and August of 1993. The gradient direction was to.the southeast. <br /> Please be informed that quarterly groundwater monitoring is recognized as a minimum <br /> reporting requirement. The groundwater should be measured and sampled immediately. <br /> Please note that inspections of sampling events are an important aspect of local regulatory <br /> oversight. PHS/EHD should be provided with at least 48 hours notice prior to the sampling <br /> event, so that an inspection may be scheduled. Also, a survey of wells within 2000 feet <br /> should be performed in order to ascertain if there are nearby wells that could influence the <br /> groundwater gradient. <br /> The extent of groundwater contamination should be determined by the installation and <br /> sampling of additional monitoring wells. Also, the extent of soil contamination at 30 feet <br /> below ground surface to the north of the site is unknown; therefore, an additional soil boring <br /> and/or monitoring well will be necessary to define contamination documented in this area. <br /> A ni%iNmn of bn)natjuln f uumy Iiralth tare ti mics <br />