Laserfiche WebLink
• �;6.uiW Vi VGi.G Yi-ii.0 <br />Memorandum <br />r <br />y , <br />To Dr. Heslep <br />Via: Dr. Clark <br />1 <br />Prom`'' <br />Dr. Kahn <br />uepartment at heattn <br />Services <br />Date : February 26, 1979 <br />Subject: DBCP in Ground Water <br />Mike Kiado of Hazardous Waste informed me on February 21 that water in two <br />wells on a ranch near OccidgntalChemical at Lathrop contain DBCP a,13�pb <br />and 6 ppb. P has been handled there for 18 months. <br />I referred him to Sanitary Engineering. Since it is not a community__„_ at,_r_ <br />supply they are not directly involved, but they want to know what to tell <br />the rancher. <br />Using the OSHA standard (0.01 mg/m3) as a reference point I compared the <br />permissible daily intake by inhalation with the intake from drinking and <br />cooking with the well water assuming complete absorption by both routes. <br />Air: 1.83 m3/hr. x 8 hr. x 0.01 - 150 )ug of DBCP <br />Water: 2 liters/day x 13 ug/liter - 26 pg of DBCP <br />It would seem that tha hazard Posed by the well water is minimal. On the <br />of er an on the assumption there is no t reshold ose for a carcinogen, <br />especially when exposure is repeated or chronic, and knowing DBCP to be an <br />unusually rotent carcinogen (and mutageII2., I recommencT that t e family be <br />advised that it would be safer to use bottled water for drinking. <br />In addition, the water should be monitored periodically for changing levels <br />of DBCP and for the presence of other pesticides used at the chemical. plant. <br />cc: John Gaston <br />EK: mm <br />SANITARY ENSINEERING <br />b RKLLEY <br />