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PUBLIC HEALTH SERVICES aP Qwi <br /> r.� <br /> �. <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION H: <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0388 <br /> 209/468-3420 MAILED JUN 141995 <br /> MARIANNE SNELL /CHARLES DeV RIES <br /> 5461 COVEY CREEK CIR 23613 E RIVER RD <br /> STOCKTON CA 95207 ESCALON CA 95320 <br /> RE: SWETT & CRAWFORD SITE CODE: 009297 <br /> 711 North Pershing Avenue <br /> Stockton, CA 95203 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) has reviewed recently <br /> submitted soil laboratory data as submitted by Upgradient Environmental Consultants and has the following <br /> comments. <br /> Currently your site is enrolled within the Local Hazardous Waste Cleanup Program and as such, investigates soil <br /> conditions in order to verify if groundwater beneath the site has be impacted. Sites that are able to verify that no <br /> groundwater has been impacted stay within this program and remediate any soils that have been documented as <br /> contaminated and not permitted to remain in place. <br /> Sites such as yours that have substantial levels of contamination in the soils that may have impacted groundwater <br /> should expand their investigation to verify the vertical extent of the soil contamination and the groundwater <br /> status. <br /> After conferring with the Central Valley Regional Water Quality Control Board (CVRWQCB), it was concluded <br /> that additional work is required onsite in order to verify additional concerns. <br /> Chlordane, 4,4-DDT, Petroleum Hydrocarbons as Diesel and as Oil and Grease have been detected from a <br /> previous RESNA investigation in shallow soil from borings B4, BI, B3, and B2. <br /> The maximum level of Chlordane and 4,4-DDT in soil allowed to be left in place is 0.03 mg/kg. No more than <br /> 100 mg/kg of Diesel may be left in place unremediated. Please ensure that any future Iaboratory analyses utilize <br /> detection limits that will verify if these levels of contaminants are present. <br /> A soil boring/punch should be placed at boring B4's location and extended downward to the current groundwater <br /> depth. Soil samples should be collected at five (5) foot intervals starting at 5 feet below ground surface and <br /> continuing into the saturated zone. A groundwater sample should be collected after reaching total depth. <br /> All samples should be analyzed for Pesticides (EPA 8080/608), Total Petroleum Hydrocarbons as Diesel (TPH-D <br /> by EPA 8015m/3510), and Oil and Grease (O&G by 4I8.1-IR 5520 B/E,F,C). <br /> Chlordane and 4,4-DDT have a cancer level of 0.1 ug/1 maximum for groundwater samples and detection limits <br /> utilized in laboratory analyses should provide for this concentration level. TPH-D and O&G should utilize a 50 <br /> ug/l detection limit. <br /> All soils that exceed 0.03 mg/kg for Chlordane and 4,4-DDT must be remediated and PHS-EHD recommends <br /> removal of this soil and confirmation sampling at the sidewalls to verify the levels of any residual material. <br /> A Division of San Joaquin County Health Care Services <br />