Laserfiche WebLink
k <br /> R604 :UPDATE 11-JULY, 1992 <br /> E <br /> TOTAL PETROLEUM HYDROCARBONS IN GROUND WATER <br /> I Floating Product <br /> CE <br /> No floating product has ever been observed in any of the <br /> monitoring wells . <br /> ' Dissolved Petroleum Hydrocarbons in Ground Water (TFH-EPA METHOD <br /> It 5030 ) . <br /> ISr ; i ' Dissolved petroleum hydrocarbons , gasoline range, were not <br /> detected in the samples obtained from monitoring well MW7 . <br /> BTEX IN GROUND WATER (EPA Method 602) <br /> No BTEX's were detected in monitoring well MW7 , see Table 2A. <br /> E TOTAL PETROLEUM HYDROCARBONS IN SOIL - CONFIRMATION DRILLING. <br /> Three proposed borings were to be drilled and sampled to confirm <br /> that the petroleum hydrocarbons in soil have been abated at P1 , <br /> P3-Swarm and southeast of the tank excavation near SB2 . The <br /> drilling took place on July 20 - July 22 , 1992 , see Work Plan. <br /> Field screening with a HNu Photoioni.zing Detector with a 10 . 2 ev <br /> bulb revealed that minor soil contamination still existed. A <br /> total of 10 soil sample barirngs were drilled ( SB3 , SB4 , SB5 , SB6 , <br /> �SB7 , _ SB8 , SB9 , SB10 , SB11 and slant boring SB12 ) . Sample results <br /> obtained from these borings are presented in Table 1 . <br /> P1 - AREA <br /> Field screening of the cuttings and samples obtained from the <br /> borings indicated that the P1 area has been remediated. Sample <br /> boring SB4 was below detection limits for Benzene, Toluene and <br /> Ethyl benzene and only the 35 foot depth sample showed Gasoline <br /> range hydrocarbons (TPH-g) at 6 mg/L and xylenes at 0 . 6 mg/L. , see <br /> Table 1 . <br /> P3-Swarm - AREA <br /> Three confirmation sample borings were drilled near P3-Swarm, <br /> ( SB5 , SB6 and SB7 ) . Only SB5 had detectable levels of TPH-g , <br /> i � ethyl benzene and xylenes . Benzene and toluene were below <br /> detection limits for all samples. SB5 showed samples below the <br /> I detection limits for benzene and toluene with ethyl benzene of <br /> 0 . 14 mg/L at the 20 foot depth and xylenes rangeing from 0 .08 mg/L <br /> to 2 .1 mg/L. Gasoline range hydrocarbons (TPH-g) were 100 mg/L at <br /> the 20 foot depth , 91 mg/L at the 30 foot depth and below <br /> jdetection limits at the 35 foot depth, see Table 1 . <br /> � E <br /> I �I <br /> 1 ; <br /> E I � <br /> I <br /> page 3 <br /> f <br />