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1 r <br /> t ' <br /> 12 May 1995 r <br /> AGE-NC-95-0121 " <br /> Page 2 of 4 <br /> 23 SITE ASSESSMENT <br /> 3 A <br />' A total of ten soil borings and nine monitoring wells were installed at the site between May 1989 and <br /> December 1994 Nine soil borings (B-1 through B-9) were dulled and sampled in May 1989 by <br /> Kleuifelder Hydrocarbons were detected in soil samples from seven of the nine borings in February <br /> I991, Meinfelder drilled and installed monitoring wells MW-1 through MW-3 at the site Total <br /> petroleum hydrocarbons (TPH-g) were detected in each well during the initial sampling In June <br /> 1991, 1.5 feet of free product was measured in MW-1 <br /> V L <br /> In May 1992,three additional monitoring wells were installed at the site (MW-4 through MW-I6) by <br /> Artesian Environmental Consultants(AEC) Petroleum hydrocarbons(TPH-g)were detected in MW- <br />' 4 and MW-6 at concentrations as great as 15,000 parts per billion (ppb) No hydrocarbons were <br /> detected in the sample from MW-5 <br />' In December 1994, three monitoring wells (MW-7 to MW-9) and one boring were installed at the <br /> site by Geological Audit Services, Inc (GeoAudit) Petroleum hydrocarbons were detected in 4 of <br /> 1 I soil samples analyzed from the wells and boring No petroleum hydrocarbons were detected in <br /> either soil or ground water samples from MW-8 or MW-9 <br /> , <br /> 2 4 GROUNDWATER DEPTH AND FLOW DIRECTION ` <br /> Ground water depth at the site has fluctuated from approximately 25 feet to approximately 33 feet <br /> below surface grade between 1991 and 1995 Ground water flow direction at the site has fluctuated , <br /> from northwest to,southeast Current ground water flow direction is north-northeast <br /> - 1 1 <br /> 3.0. , .PROCEDURES <br /> 3 I- MONITORING WELL PURGE`PROCEDURES <br /> 4 <br /> On 30 March 1995, the depth to ground water and product thickness in all nine wells were measured <br /> relative to the top of the well casing using a Sohnst water level meter or an P <br /> Ulla'g a interface robe <br /> Data sheets for the March 1995 monitoring performed by GeoAudit were not available Therefore, , <br /> ground water depths were remeasured by AGE in May 1995 <br /> Each well was then purged using a 2-stage submersible purge pump Approximately 7 to 12 gallons <br /> (a minunum,of3 well volumes) of water were removed from each well to stabilize temperature, pH <br /> and conductivity Stabilization data were collected at one-gallon intervals using an ICM water <br /> analyzer Purged water was placed in 557gallon drums for temporary storage on-site <br /> J a <br /> i J <br /> 1 w <br />