Laserfiche WebLink
ENVIROI' MENTAL HEALTWI)EPARTMENT <br /> > SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> c Donna K.Heran,R.E.H.S. <br /> Director <br /> 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> _ Douglas W.Wilson,R.E.H.S. <br /> C4C/F ORa`P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> ANDY EGGIMAN MAY 2 5 2005 <br /> C/O ROBERT EGGIMAN <br /> PO BOX 580 <br /> MOUNTAIN RANCH CA 95246 <br /> Re: EGGIMANS HYDRAULIC Site Code: 1914 <br /> 1112 E HARDING WAY <br /> STOCKTON,CA 95205 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed First—Quarter <br /> 2005 Alonitoring Report dated May 14,2005, and Summary Report ofAdditional Subsurface <br /> Investigation dated May 4,2004 prepared by ATC and Associates, Inc (ATC) for the above- <br /> referenced site. A cone penetrating testing boring CPT-1 was advanced near the former <br /> underground storage tank (LJST) to a depth of 100 feet below surface grade (bsg) in July <br /> 2003. Soil and grab groundwater samples were collected from boring CPT-1a adjacent to <br /> CPT-1. Four monitoring wells MW-4,MW-5,MW-6, MW-7, and one soil boring SB-8 were <br /> subsequently installed on site and off site in December 2003. Depth to groundwater in 2003 <br /> and early 2004 was approximately 45 feet below surface grade (bsg). Groundwater flow <br /> direction has been generally northeast since 2001. <br /> Soil Investigation Results <br /> Analytical results of the northwest off-site MW5 soil sample at 30.5 feet bsg were 1,200 <br /> milligrams per kilograms (mg/kg) of Total Petroleum Hydrocarbons as gasoline (IPH-g), <br /> and at 40.5 feet bsg were 590 mg/kg. Results of the northeast off-site MW7 soil sample at <br /> 45 feet bsg were non-detect in all analytes except 0.10 mg/kg of 1,2-dichoroethane (1,2- <br /> DCA). 1,2-DCA was not detected in any other soil samples. In a previous investigation in <br /> April 2000, on-site soil boring SB7 (near the former UST) soil samples at 60.5 feet bsg and <br /> 65.5 feet bsg were non detect for the analytes. <br /> Groundwater Investigation Results <br /> Analytical results of the deepest grab groundwater sample from CPT-1 collected from 78 to <br /> 80 feet bsg were non detect for all analytes. However, since the detection limit of 1,2-DCA <br /> was 2.0 micrograms per liter (ug/1),and the Maximum Contaminant Level (1NICL) for 1,2- <br /> DCA is 0.5 ug/l,it is unknown if the vertical extent of the 1,2-DCA plume has been defined. <br /> 1,2-DCA was detected in all 7 wells during the last 5 quarters. Methyl tert butyl ether <br /> (MTBE) continued to be detected in all the monitoring wells except MW-5 and MW-6,and <br /> tert-butanol (TBA) has also continuously been detected in all the monitoring wells except <br /> MW-4 and MW-5. Total Petroleum Hydrocarbon as gasoline (TPH-g) and aromatic <br /> hydrocarbons have been detected in all the on-site and off-site monitoring wells except <br /> MW-4. <br />