Laserfiche WebLink
�¢id',�' '' _ - -- yrs.•c:y7 -� --g- '4-- "-^t���AYr �r� t� - � Ar 3 . .s � � e;.€,M,t' - gam. a';nv.s^�.n-z�, <br /> dfiY <br /> t <br /> 4.2 Laboratory Analysis - Soil <br /> r� <br /> "IN intervals <br /> laboratory analysis of samples collected at five foot <br /> intervals from 10.0 to 40.0 feet in the well boring did not <br /> record the presence of BTEX above the 0.02 ppm method <br /> detection limit. The TPHG concentrations were not detected <br /> above the 5.0 ppm detection limit in any of the samples. <br /> The laboratory test results for these samples and previous <br /> product line samples (#1 to #4) are summarized in Table 2. <br /> Laboratory data sheets, chain-of-custody forms and <br /> laboratory quality control data are presented in Appendix <br /> IV. <br /> ¢ 4.3 Laboratory Analysis - Groundwater <br /> The laboratory analysis of the groundwater sample collected <br /> ii from well MWI did not record the presence of BTEX above the <br /> 0.3 ppb method detection limit. The TPHG concentration was <br /> tonot detected above the 30.0 ppb detection limit. The <br /> �. laboratory test results for this sample is summarized in <br /> Table 2. Laboratory data sheets, chain-of-custody forms and <br /> laboratory quality control data are presented in Appendix V. <br /> 3- <br /> 5.0 CONCLUSIONS <br /> c 14 Primary contaminant source control has been achieved at the <br /> site with the repair of the: unleaded product lines. The <br /> underground fuel storage and distribution systems have since <br /> been indicating no cux.rent source of leakage exists. tested <br /> tight. The other source for potential continuing <br /> r„ contamination are soils containing elevated levels of <br /> hydrocarbons. <br /> The result of field inspection and laboratory analysis of <br /> soils collected from a shallow (6 ft) trench and the well <br /> � .baring (MW1) ,located adjacent to the documented source, ; <br /> indicate that only limited hydrocarbon contamination has <br /> e occurred as a result of leakage of unleadedg asoline to the <br /> subsurface... T3ys'"!-highest....conc6ntratib.fi of '°tdtal� j*troles�m -� <br /> lyairs�carbons` (800:-ppm .in sample #2) was .recosrded in =,the' S:°° <br /> foot soil sampl�3 collected nearest to `the hole found "in the1 <br /> unleaded pgodu6t mos:liThe `n6h-rdetectabl 'tpH concefitrat16h <br /> tj <br /> in"the-::six foatroduct lirse 'srsm les"�aol3ected to the' wee <br /> xs :{iaample" #1) `:and seat Cgample #4) suggesit the lateral �extent <br /> air "spseading,^is' limited -to a: rzadius of approximately <br /> 6. <br /> feet: The non-detectable levels of gasoline hydrocarbons in <br /> seven samples collected between a depth of 10.0 to 40.0 feet <br /> 4 =_F indicate the contamination is limited to the upper 10 feet <br /> of soil. <br /> _ _ <br /> Based on this data, a volume of approximately 260 cubic <br /> !" yards of soil have been impacted by varying concentrations <br /> of gasoline hydrocarbons. The <br /> limited extent of soil <br /> contamination Lndicates no immediate threat to health, <br /> 4 <br />