Laserfiche WebLink
18 March 1996 <br /> AGE-NC Project No 95-0143 <br /> Page 2 of 4 <br />' <br /> prepared ar by AGE <br />' From September to November 1995, five additional monitoring wells (MW-10, MW-14, MVV-15, <br /> MW-16 and MW-17)were installed at and near the site Petroleum hydrocarbons were not detected <br />' in any of the soil samples analyzed <br /> Ground water samples have been collected from morutoring wells on the site on 15 occasions <br />' Petroleum hydrocarbons have not been detected in monitoring wells MW- 14, MW-15, MW-16 or <br /> MW-17 Toluene and xylene have been detected in lNrlW-10 at concentrations of 0 87 ppb and 0 80 <br /> ppb, respectively Petroleum hydrocarbons have been detected in ground water samples collected <br /> from the remaining monitoring wells sampled during each monitoring event Free product has been <br /> consistently present in morutonng well M\N,-3 In 1994, a compressor-driven slimmer was installed <br /> to remove floating product from MW-3 <br />' A plume of contaminated ground water is present on the Crystal Cream and Butter Company site on <br /> the west side of Van Buren Street at 404 West Fremont Street The two plumes do not appear to <br /> have coalesced Several additional sites with possible impacted ground water are located up-gradient <br /> and cross-gradient of the site However, the plumes from these sites do not appear to have impacted <br /> the subject site <br /> 3.0. PROCEDURES <br /> 3 1 MONITORING WELL PURGE PROCEDURES <br /> On 08 February 1996, a Solinst water level meter was used to measure the depth to ground water in <br /> each well relative to the top of the casing Free product was encountered in MW-3 and the thickness <br />' was measured using an Ullage interface probe The relative ground water elevations and hydraulic <br /> gradient were determined from these data (Table 1) <br /> On 09 February 1996, each monitoring well, except for MW-3, was purged using a 2-stage <br /> submersible purge pump Well MW-3 was not purged due to the presence of free product The pump <br /> was decontaminated prior to purging each well using an Alconox solution Temperature, pH and <br /> conductivity were measured at regular intervals during the purging process using an ICM model <br /> 52200 water analyzer A minimum of three well volumes of water, approximately 6 to 10 gallons, was <br /> evacuated from each well to stabilize the well parameters Approximately 45 gallons of water was <br /> I purged from MW-9 All purged water was stored in 55-gallon DOT drums on-site Stabilization data <br /> and field logs are included in Appendix A <br /> I <br />