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~ <br /> PUBLift HEALTH SERf ICES <br /> SAN JOAQUiN COUNTY <br /> JOGI KHANNA M.O..M.P.H. '. <br /> Health Officer si ' P <br /> P.O. Box 2009 • (1601 .East Hazelton Avenue) • Stockton, California 95201 <br /> (209)468-3400 <br /> AUG 2 1991 <br /> n <br /> PETER VOSKES cc, Py <br /> NORMAC INC <br /> 3449 LONGVIEW DRIVE <br /> NORTH HIGHLANDS CA 95660 <br /> i <br /> RE: Normac, Inc. IN REPLY REFER TO SITE CODE: 1258 <br /> 6215 Tam O'Shanter <br /> Stockton, CA <br /> This is to summarize items discussed on June 13, 1991, at a meeting <br /> held at the San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) offices with you and the <br /> Normac consultant, William Hunter. The meeting was to discuss the I <br /> Preliminary Site Assessment Information presented to PHS/EHD in a <br /> report prepared by Mr. Hunter. Since that meeting we have received , <br /> letters from Hammertown Partners and Normac attorneys requesting ' <br /> information about the status of the site assessment and a more <br /> definitive statement as to why we cannot consider closure of the <br /> site as Mr. Hunter has recommended. This summary should answer all <br /> concerns. <br /> Our agency uses the LUFT (Leaking Underground Fuel Tank) Manual as <br /> a guidance document when reviewing site investigations. There are it <br /> work sheets within the LUFT Manual that PHS/EHD staff use to <br /> evaluate the amount and level of soil contamination that may be <br /> left in place. Depending on site conditions, some contamination <br /> may be left in place because it should not be a threat to <br /> groundwater. These work sheets refer to seasonal high depth to <br /> groundwater. Seasonal high depth to groundwater for this site is <br /> approximately 45 feet per Spring 1986, San Joaquin County Flood <br /> Control Map. <br /> In February, 1990, the tank pit was re-excavated. The results `o.f <br /> the soil sample from the bottom of this re--excavation indicate that <br /> benzene, toluene, ethylbenzene, xylene are present 21 feet below <br /> ground surface at .285 parts per million (ppm) ; . 610 ppm, . 064 ppm <br /> and .554 ppm respectively. This is greater than the amount of <br /> contamination that can be left in place without further <br /> investigation using the LUFT Manual Leaching Potential Analysis, <br /> A copy of the worksheet is enclosed. Also, the results from the <br /> soil sample taken from the west side wall of the excavation (in the <br /> direction of Hammerstown property) fail the Leaching Potential <br /> Analysis. <br /> A Division of San Joaquin County Heilth(are SCIV[CG5 �� <br />