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i <br /> fi..3_1 soil samples were analyzed for -the following parameters: <br /> 0 Organochlorine :Pest.Icides EPA Method 8080 <br /> 0 Organophosphorc_iis Pesticides EPA Method 8140 <br /> 0 Carbamates Method 632 Modified. <br /> .71.1 water samples were analyzed for the following parameters: <br /> o Organochlorine Pesticides EPA Method 608 <br /> o Orga.nophosph.oro 's Pesticides EPA Method 614 <br /> o Chlorinatf:�d :T'heroxy Acid Herbicides SM 509B <br /> 0 Carbamate Pes_,t.i c:ides EPA Method 632 <br /> Triazine T-[{-�-�, _r .deli EPA Method 619 <br /> A summary of the analytical results for soil and water is pre <br /> .� sent.ed in Tab'les 2 _arid ;5. respectively and al' laboratory reports <br /> „,?, their erat.:i r F t., a is e presented in Append.i.ces B acid C. <br /> '.� i_ Inter rotation of Soil Sample Results <br /> As shown on Talble 2 , all but one borehole soil. sample (BC-5) <br /> contained detectable concentrations of one or more of the chemi- <br /> cals for which the analyses were conducted. <br /> To compare the chemical concentrations found to regulatory agency ;.• <br /> c:iRiteria, Table 2 in(-_:Iudes entries from published regulatory , <br /> E:4, �.*ldards . The standards utilized for the comparison purposes <br /> are, as follows." <br /> �- c) California. Department of Health Services (DOHS) Total <br /> Threshold .T_,i.m7.t. Coi)�.-entrat.i_on (TTLC) <br /> a Regional_ Water Q.._3.a.t.i.ty Control Board (RWQCB) designated <br /> levels (DL) for allowable chemical concentrations in a solid <br /> for the protection of. groundwater. <br /> compared to these standards, only the samples collected from <br /> four, boreholes (BA, BC, BG and BH) contained concentration of <br /> pesticidee compounds in excess of current regulatory criteria. <br /> Th(--, only compound:, found above regulatory criteria were from the <br /> DDT family of chemicals (DDT, DDE and DDD) . As an aid to inter- <br /> pretation, figure 4 presents the total DDT compound concentra- <br /> tions (DDT + DDTD •+- DDE) as found at each borehole location. <br /> At borehole BA, while the concentrations detected were below the <br /> •- TTLC value of 1 mq/Kg, the soil samples collected from all three ;,_ ; <br /> depths (1 " , 3 ' anal. 5 ' .) contained concentrations of 4 , 4-DDT in <br /> excess of the DL, which for this compound is 240 ng/Kg. <br /> For borehole BC, 4 ,4--DDT and 4 , 4-DDE were only detected in the 1' <br /> and 3 ' samples. The concentrations observed in the sample <br /> collected from the 1 ' depth exceeded both the DL and the TTLC <br /> 7 <br />