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Phase 11 Environmental Site Assessment Mountain House Neighborhood G July 9,2002 Page 6 TABLE2 Summary of Detected Constituents in Discrete Samples Sample ID 11 12 Dat 09/28/2001 09/2 /2001 Analytical Metha 8141A 8141A CONSTITUENT Detection Limit PRG 4zinphms methyl 99-100 w/kg NE 110t ND Bolstar 20-21 pg/kg NE 5.5* ND Chlorpyrifos 9.9-10 pg/kg 180000 pg/kg 5.3* ND oumaphos 20-21 pg/kg NE 38t 34t Demeton(total) 9.9-10 Kft 2400 pg/kg 7.5* ND Diazinon 9.9-30 mft 55000 pg(kg 63* 4.0* Dimethoate 20-21 pg/kg 12000 pg/kg 16*t 17*t Disulfotun 9.9-10 pg/kg 2400 pg/kg ND 9.3* Ethoprop 9.9-10 pg/kg NE 15 15 Ethyl parathion 9.9-10 pg/kg 370000 pg/kg 6.1* 5.2* Famphur 39-41 pg/kg NE 12* ND Fensulfothion 99-100 pg/kg NE 5.7* 16* Fenthion 9.9-10 pg/kg NE 29 30 Merphos 9.9-10 pg/kg 1800 pg/kg 11 ND Methyl parathion 9.9-10 pg/kg 15000 pg/kg 19 l8/8.9* Mevinphos 250-260 pg/kg NE 14* 20- 0,O,O-Triethylphosphorothionte 9.9-10 pg/kg NE 12 7.9* etrachlorviophus 99-100 pg/kg 20000 pg/kg 6.8* ND hionazin 9.9-10 pg/kg NE 12 12 okuthion 9.9-10 pg/kg NE 5.2* ND richloronate 9.9-10 pg/kg NE 29 30 gg/kg:micrograms per kilogram=parts per billion ND=Not detected NA=Not analyzed NE= PRG not established for this constituent. *=Concentrations are below laboratory reporting limits and are estimated. =Constituent detected at a reportable level in the method blank. 7.0 HUMAN HEALTH SCREENING EVALUATION 7.1 GENERAL COMMENTS The purpose of this human health screening evaluation is to provide the risk manager with an estimate of the potential chronic health hazard from contamination at the site. The risk and hazard estimates are calculated for exposure pathways most frequently encountered at a residential setting. Due to the generic nature of these assumptions, the risk and hazard estimates are not absolute estimates of risk or hazard at the site. This screening evaluation consists of a compilation of methods, models, and assumptions used by the United States Environmental Protection Agency (USEPA) and the California Department of Toxic Substances Control (DTSC) to quantify risk and hazard. The default exposure factors chosen for this evaluation are those recommended by the USEPA to represent a reasonable maximum exposure in a residential setting, except for exposure frequency and duration. The default values chosen for exposure duration and frequency were based on the assumption that adults would be exposed for 30 years and iA� CONDOR