Laserfiche WebLink
V %MOO <br /> CHRONOLOGY <br /> RIPON MILLING COMPANY <br /> 320 SOUTH STOCKTON AVENUE,RIPON, CA 95366 <br /> 08/16/94 A 10,000 gallon steel diesel underground storage tank(UST)State ID 53870001,and a <br /> 6,000 gallon steel diesel UST State ID 53870002 at the above referenced site were <br /> removed. Strong odor detected. Soil samples beneath the USTs were collected for <br /> laboratory analyses. <br /> 08/19/94 1450 cubic yards of contaminated soil to approximately 24 feet below surface grade(bsg) <br /> was over-excavated and stockpiled at the site. Bottom of the excavation at 24'bsg <br /> appeared"clean". <br /> 08/28/94 Prop 65 and Unauthorized Release Reports were completed and filed. <br /> 09/02/94 The highest concentration of contaminant as reported in the analytical results of the soil <br /> samples taken from the tank excavation at 14'bsg were 5500 parts per million(ppm)of <br /> diesel, 6.8 parts per billion(ppb)of Ethylbenzene,and 37 ppb of Xylenes. Kerosene, <br /> motor oil,and other aromatic hydrocarbons were not-detect. <br /> 09/07/94 Official Notification of Reimbursement(NOR)was issued to responsible party(RP)from <br /> San Joaquin County Public Health Services Environmental Health Division(PHS/EHD) <br /> and the site was placed into PHS/EHD Local Oversight Program(LOP). Additional work <br /> to investigate potential impact to groundwater was required. <br /> 03/07/95 A monitoring well was installed at the site with screen length from 21`bsg to 41'bsg <br /> 08/4/95 Analytical results of the soil samples from 16',21',and 26'bsg were all not-detect above <br /> detection limits in gas,diesel,and aromatic hydrocarbons. 2 ppb of Benzene,Toluene, <br /> and Xylenes were reported in 2 quarters of groundwater monitoring. <br /> 10/11/95 PHS/EHD expressed that although low levels of benzene and Xylenes are detected in <br /> groundwater,the background water quality is already polluted with TCE from the Nestle <br /> site. PHS/EHD determined that additional investigation is not warranted. PHS/EHD <br /> recommended the stockpile be characterized and the well be destroyed. <br /> 04/09/96 Monitoring well was destroyed by pressure grout. <br /> 10/30/97 Received analytical results of 29 soil samples from the stockpile. The highest <br /> concentrations were 257 ppm of diesel,270 ppm of motor oil, 175 ppb of Xylenes and <br /> 28 ppb of Ethylbenzene. Gas and other aromatic hydrocarbons were not-detect above <br /> detection limit of I ppm and 3 ppm,respectively. <br /> 11/27/96 Ripon Police Department requested using the stockpile for their firing range berm. <br /> 03/05/98 Met with representatives of City of Ripon Police Department. Informed them of the <br /> potential liability when assuming ownership of contaminated soil. Recommended they <br /> should check for lead in the stockpile. <br /> 02/19/98 Approximately 1450 cubic yards of stockpiled soil was transported from site to City of <br /> Ripon Police Department firing range. <br /> 05/11/00 Received Record Title Owner Notification Certification letter. <br /> 08/21/00 PHS/EHD recommended this site for closure. <br />