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�./ *M./ 31 August 2004 AGE-NC Project No.04-1188 Page 23 of 24 season in which it is applied. The estimated aqueous half-life for the insecticide is 6 days in surface water and over 25 weeks in groundwater. There is some potential that the restricted LANNATE 90SP may have contaminated groundwater below the subject property,but it has not been applied since July 2002, and AGE has no direct evidence that such contamination has occurred. • Only three chemicals were listed with TCM effects, DIMETHOATE 4E, a pesticide with suspected teratogenic and carcinogenic effects at high doses,WEEDAR 64,an herbicide with suspected carcinogenic effects with long exposure and ETHEPHON 2, a plant growth regulator with suspected, not proven, teratogenic effects. All three substances have a low _ persistence in soil with rapid degradation and all but ETHEPHON 2 have short half-lives in water; ETHEPHON 2 documentation had no water data. WEEDAR 64 was last applied in March 2001 and ETHEPHON 2 was last applied in September 2002. DIMETHOATE 4E _ was last applied in July 2004. There is some potential that one or all of these chemicals may have contaminated groundwater below the subject property; only DIMETHOATE 4E has a recent application, but AGE has no direct evidence that contamination has occurred. '— • The river was at a higher elevation than the subject property;AGE saw little indication that the subject property had impacted the river;the river could impact the property by flooding. ,r • The residential complex included a domestic water well and in-ground septic system. There is no evidence from the site reconnaissance,the interview or the SJCACO records that agricultural chemicals have been applied out of compliance with federal,state or local laws. The continued best-use of the property appears to be agricultural use;the only way to obtain a higher degree of certainty regarding the potential for agricultural chemical impact to the property would be with a sampling and laboratory analysis program,which does not appear to be warranted at this time,based on current and projected use. 10.0. RECOMMENDATIONS .. Based upon the findings of this Surface/Subsurface Contamination Report, AGE recommends the following: • If the residential complex is to be removed,the domestic well and in-ground septic systems should be abandoned under permit. • If the subject property use is changed from agricultural to large-scale residential, further investigation for possible soil and/or groundwater contamination by agricultural chemicals should be implemented. Advanced GeoEnvironmental,Inc. r