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Project No 58080-06-02 January 5, 1995 ' Page 5 Table I A site plan depicting the groundwater elevation contours and groundwater gradient ' direction is presented as Figure 5 R Soil Sample Analytical Results Soil samples collected from borings GB-6 through GB-I 1, MW-4 and MW-5 were tested for the presence of TPHg, TPHd, BTEX and MTBE The cumulative results of previous soil analyses ' performed between March 1991 and April 1994 are summarized in Table II A summary of soil ' sample analyses performed since July 1994, including the soil sample analytical results for this phase of investigation are presented in Table III Copies of laboratory reports and chain-of-custody records are included in Appendix B TPHg was detected in borings GB-6, GB-7, GB-8, GB-9 and GB-10 at concentrations ranging from 15 to 6,700 mg/Kg with the majority of TPHg detected_m the 25 foot sample in With the �f�tg'3S ' exception of 15 mg/Kg of TPHg detected at the depth of 50 feet bgs in boring GB-6, all other TPHg was detected between the depths of 15 and 35 feet bgs The laboratory reports for TPHg indicate that for those soil samples with detectable hydrocarbons, the chromatogram pattern is one of ' "unidentified hydrocarbons" with a carbon range greater than C, } TPHd was detected in borings GB-8 and GB-10 at concentrations ranging from 20 to 410 mg/Kg and is present between the depths of 15 and 35 feet bgs for GB-8 and 25 and 35 feet bgs for GB-10 l Similar to samples tested for TPHg, the laboratory reports for TPHd indicate that for those soil samples with detectable hydrocarbons, the chromatogram pattern is one of "unidentified hydrocarbons" with a carbon range from CS to C14 was not detected in any of the samples tested from depths ranging from 25 feet to 40 feet ✓ ' bgs (onsite borings and boring MW-5) and depths ranging from 15 to 55 feet (boring MW-4) Groundwater Analytical Result% Groundwater samples collected from \4W-1 through MW-5 were tested for the presence of TPHg, TPHd BTEX MTBE and VOC s A cumulative summary 617 groundwater analytical data is ' presented in Table IV Copies of laboralor,\ ieports and chain-of-custody records are included in C Appendix B Dissolved TPHg ieported as�Neathered gasoline was detected in upgradient monitoring f? well MW-5 and onsite well MW-3 at Lonc.entiations of 88 ug/t. and 250 ug/L, respectively TPHg was not detected in wells MW-1, MW-2 and MW-4 TPHd was reported in wells MW-1, MW-3, MW-4 and MW-5 at concentrations ranging from 52 ug/L (MW-4) to 190 u L MW-3 The laboratory reports for TPHd indicate that for those groundwater samples with detectable petroleum hydrocarbons, the chromatogram pattern is one of "unidentified hydrocarbons" with carbon ranging from C9 to C22 MTBE was detected in wells MW-1, MW-3 and NJW-5 with therhighest concentration present in 1 offsite upgradient well MW-5 at a concentration of 610 ug/L