Laserfiche WebLink
• Supplletal Site Investigation Scoping Document <br /> Pittman Elementary School,Stockton,California <br /> " January 23,2004 <br /> Page 5 <br /> change, PEA sample L7, collected in the eliminated northwest portion, has now been included as a <br /> background metals sample. <br /> Table 2-Summation of Risk and Hazard For All Constituents Of Potential Concern (excluding Lead <br /> From calculations based on the PEA Guidance From calculations based on the Johnson&Ettinger Model(soil gas and groundwater) <br /> Highest 95%UCL Value Highest 95%UCL Value <br /> Concentration Concentration <br /> Chemical Risk I Hazard Risk Hazard Chemical Risk I Hazard Risk Hazard <br /> Barium NC 1.89E-01 NC 1.74E-01 Acetone NC 2.50E-04 NC 3.10E-04 <br /> Beryllium 5.69E-081.15E-0 .76E-089.61E-03 Benzene 3.60E-08 4.90E-05 3.60E-084.80E-05 <br /> Chromium III NC 9.13E-0 NC 7.62E-0 1,3-Butadiene 1.40E-06 9.60E-04 1.20E-06 8.40E-0 <br /> Chromium VI 5.70E-06 2.82E-0 5.36E-06 2.65E-0 2-Butanone(MEK) NC 7.20E-06 NC 9.20E-0 <br /> Cobalt 1.90E-061.64E-011.61E-061.39E-0] Carbon Disulfide NC 6.90E-06 NC 8.40E-0 <br /> Nickel 5.15E-07 5.36E-0 .27E-07 4.45E-02 Chloroform 3.40E-09 5.00E-06 1.50E-09 2.20E-0 <br /> Aldrin 4.40E-08,6.41 E-04 2.34E-083.42E-0 - 1,3-Dichlorobenzene NC 9.90E-06 NC 9.00E-06 <br /> alpha-BHC 5.21E-09 2.98E-05 2.95E-09 1.69E-05 1,2-Dichloroethane 8.20E-08 2.30E-05 3.60E-08 9.90E-0 <br /> beta-BHC 2.86E-09 7.36E-05 1.47E-09 3.77E-05 Ethyl Benzene NC 4.20E-06 NC 4.30E-0 <br /> delta-BHC* 1.21E-08 NC 8.56E-09 NC Hexane NC 7.60E-05 NC 6.70E-05 <br /> gamma-BHC 3.58E-09 8.38E-05 1.94E-094.55E-05 Methyl tertiary-Butyl Ether 1.00E-08 3.00E-05 8.40E-09 2.50E-05 <br /> alpha-Chlordane** 3.63E-07 4.32E-03 6.95E-08-i 2813-0 Methylene Chloride 7.30E-09 4.30E-05 6.30E-09 3.70E-05 <br /> Chlorobenzilate 8.00E-091.10E-OS .1913-09 5.77&06 Propylbenzene NC 1.40E-05 NC 1.30E-05 <br /> DDD 3.49E-10 NC 2.41E-10 NC Tetrachloroethene 1.70E-07 1.90E-03 2.20E-07 2.40E-03 <br /> DDE 2.18E-08 NC .51E-09 NC Toluene NC 7.50E-05 NC 3.40E-04 4.29E-08 1.97E-03 1.21 E-08 5.54E-04 Trichloroethane NC 1.50E-05 1.40E-092.60E-06 <br /> Dieldrin 4.30E-06 4.00E-0 9.65E-078.97E-03 1,1,1-Trichloroethane 1.50E-09 2.90E-06 NC 1.90E-05 <br /> Endosulfan II*** NC 2.22E-06 NC 2.18E-06 1,2,4-Trimethylbenzme NC 1.60E-03 NC 1.60E-03 <br /> Endrin Aldehyde NC NC NC NC 1,3,5-Trimethylbenzene NC 4.60E-04 NC 4.50E-0 <br /> Endrin Ketone NC NC NC NC m,p-Xylene NC 2.00E-04 NC 2.20E- <br /> Heptachlor 3.11E-08 1.13E-0 1.00E-08 3.64E-05 o-Xylene NC 7.50E-05 NC 8.50E-05 <br /> Heptachlor Epoxide 2.28E-07 2.37E-0 .74E-084.93E-03 Summation(soil gas and groundwater) 1.71E-06 5.81E-03 1.51E-06 6.50E-0 <br /> Summatiotr(soil) <br /> 1.32E-0515.18E-011 <br /> Highest Concentration 95%UCL Value <br /> Risk Hazard I Risk I Hazard <br /> Summation(soil) 1.3234E-05 0.51807461 8.59E-06 10.410209 <br /> Summation(soil gas and groundwater) 1.7102E-06 0.0058061 1.51E-06 0.006499 <br /> Summation(soil,soil gas,and groundwater) 1.49E-05 5.24E-01 I 1.01E-05 4.17E-01 <br /> Data discussed in the text is Based on highest concentration of CDPC. <br /> UCL:Upper confidence level <br /> NC:Not calculated due to lack of toxicity data <br /> *BHC-technical toxicity data was used for delta-BHC. <br /> I **Chlordane toxicity data was used for alpha-chlordane and gamma-chlordane. <br /> ***Endosulfan toxicity data was used for endosulfan II. <br /> 3.0 SAMPLING STRATEGY <br /> The following sections describe specific sampling strategies for each of the three areas in which further <br /> investigation is proposed. The overall sampling strategy is to constrain the extent of identified chemicals of <br /> i .l <br /> CONDOR <br />