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TSERVICES� z: <br /> PUBLICUIN COUNTY :< <br /> SAN JOAQ :. <br /> ENVIRONMENTAL HEALTH DIVISION <br /> p.H., Health Officer .o <br /> Karen Furst, M.D., M•304 East Weber Avenue,ThirdFloor • Stockton,CA 95202 ILE <br /> 2091468-3420 .4- <br /> GROWERS ' <br /> TRI VALLEY <br /> CF3RI 5 SAVAGE <br /> 2260 TENAYA D 95354 t <br /> MODESTO CA N + <br /> - SITE CODE. 1920' <br /> RE-. Tri Valley Plant T <br /> 26,200 N. Gait Rd. ! <br /> Thornton CA., .95686 = f <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) has <br /> recently evaluated the above referenced site and offers the following comments. <br /> The most recent subsurface investigation (March 1998) advanced groundwater sampling <br /> 27 (-HP-3WB"), and 31' ("HP-2WC") bei, <br /> ground surface (bgs). <br /> equipment to 22' ("H ' <br /> three groundwater samples reported elevated levels f het three groundwater samples had <br /> All g <br /> a pattern of increasing concentrations with depth. Two of <br /> one foot) of the groundwater <br /> Y <br /> soil samples collected at depths very close (within app mples and were non-detect for petroleum ("HP-1 SD' @ 21' bgs and "HP-3SG" @ 25.5' <br /> grab sa <br /> bgs). ; <br /> "HP-2SG" was collected at 21' bgs and reported Total Petroleum aster samples Gasoline (TPH- <br /> Soil samplele was the closest soil sample g <br /> G) at 570 mglkg. This soil same <br /> ' that had 17,000 ug/1 of TPH-G and 440 ugll Benzene in the <br /> collected at 31' bgs {"H soil s ) <br /> water. Without a soil sample at or very close to the dcefinaedd'subsurfacensouater rce/influenlce t <br /> ground , _ <br /> 31' bgs ("HP-2WC"),'PHS-EHD is concerned that some un f <br /> ing the deeper groundwater quality- <br /> is present and effect <br /> The increasing concentration with depth trend noted in the three "HP" groundwater samples <br /> shows that the groundwater contamination is not vertically <br /> nfluencing this contaminated <br /> require <br /> additional investigation in this area to define the source <br /> groundwater area. <br /> PHS-EHD recommends that a work plan be submitted that includes an investigation in the "HP- <br /> as well as in the immediate area around the form�rte surgrounding area should round storage tank (UST) <br /> pit. <br /> 2 area s and <br /> Soil from the interval noted above (21' to 35.5' the <br /> oxygenates. In addition, to support <br /> collected and analyzed for TPH-G, Ba d gdro ndwater samples should be collected and. <br /> conclusions for lateral delineation, soil <br /> analyzed at the same depth(s) previous sampNng results have indicated petroleum <br /> Y PHS-EHD also recommends that soil and groundwater <br /> contamination exists (target depths). <br /> anal zed at 5' increments.below the target depths in order to verify <br /> samples be collected and Y <br /> the vertical extent- . <br /> Division e*car Joaquin County Healtts Care Services <br />