Laserfiche WebLink
PUBLIC HEALTH SERVICES <br /> Pq U F 1y <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION y `z4 <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officers;; �- ��:: T. <br /> 304 East Weber Avenue, Third Floor • Stockton! CA 952022 , <br /> �o <br /> 209/468-3420 is �•� <br /> BRUCE MC CANDLESS JW 16 W7 <br /> RIPON FARM SERVICE <br /> PO BOX 806 l <br /> RIPON CA 95366 ti <br /> RE: Ripon Farm Service, 22871 South Highway 99, Ripon CA, I SITE CODE: 1605 <br /> E San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed review <br /> of the "Quarterly Report - March 1997" dated May 19, 1997 that wasprepared by Advanced <br /> GeoEnvironmental. PHS/EHD has the following comments for your consideration. <br /> 'f <br /> li r <br /> The results of the offsite investigation that was performed on October 30, 1996 indicated that the <br /> contamination observed in samples collected from MW2 has migrated off site. Significant soil <br /> contamination was noted up to 1,700 ppm TPH-diesel and 240 ppm',TPH-gas in the soil sample collected <br /> from soil boring, B15, at 10 feet below ground surface and up to 5,400 ppb TPH-diesel and 2,400 ppb <br /> TPH-gas in the groundwater sample collected from soil boring 614. ' <br /> The concentrations of petroleum hydrocarbons evidenced in the samples collected from the on site <br /> monitoring wells on March 24, 1997 indicated that additional investigation will be required to determine <br /> the lateral extent of the groundwater contamination plume. Also, PHS/EHD has reviewed historic <br /> analytical results and has determined that the vertical extent of the contamination has not been <br /> adequately delineated Soil boring, B4 drilled to 20 feet bgs and monitoring well MW1 drilled to 25 feet <br /> bgs that were located adjacent to the former tank location, evidenced significant soil contamination up to <br /> 3,800 ppm TPH-gas (84) and 2,600 ppm TPH-diesel (MW1). I'f <br /> Please submit a work pian to complete the investigation of the extent ofsoil and groundwater <br /> contamination plumes by August 10, 1997. 1 <br /> The evaluation of remedial alternatives should be initiated. Since it is likely that feasibility analysis will <br /> require the installation of testing wells, PHS/EHD suggests that a work plan[be prepared. In fact, it is <br /> likely that the installation of depth discrete monitoring wells will be necessary to evaluate the potential for <br /> vertical migration. PHS/EHD understands the difficulties associated with designing a remediation system <br /> without full site characterization; however, the concentrations which have been evidenced will likely <br /> require active remediation. ° <br /> E <br /> E �F <br /> PHS/EHD has emphasized the importance of submitting accurate tables. Itis unfortunate that PHS/EHD <br /> must once again point out an error in Table 2 of the above referenced report: 1.6 ppb Ethylbenzene and <br /> 2.1 ppb Xylene were actually detected according to the attached laboratory:' eport instead of the <0.50 <br /> ppb which was reported. 'r <br /> 1f you have any questions, please contact Mary Meays at (209) 468-0`337. <br /> o <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> it <br /> 17 IV <br /> Mary Meays, Senior EHS MargarretJ a�gorio, REHS <br /> Site Mitigation Unit Supervisor <br /> Ip J ; <br /> cc: Elizabeth Thayer, CVRWQCB cc: James DeMera, PO Box 56011-odi CA 95241 <br /> cc: Bob Marty, 1803 March Lane Ste. A Stockton CA 95207 f] <br /> cc: George, Firenze, Olympian Oil, 260 Michele Court, South San Francisco CA 94080 <br /> cc: John Trump, 2280 Union St. San Francisco CA 94123 �' a <br /> A Division of San Joaquin County Health Care'Services <br /> If �� <br />