Remedial Investigation/recommended action-1995

Home Browse Search

� Sailors World, Inc. Summit Project No. 922030 � October 5, 1995 Page 3 � 2.3 Site Location and Description � The subject site is located on County Road 15, approximately S miles west of Wayzata, Minnesota. The site is located in the SEl/a of the SWt/a of the NWl/a of the SEl/a of Section 10, Township 117 North, Range 23 West, in Hennepin Counry (Figure 1). Site structures and � features include a club house building, several temporary garage units, and an asphalt pazking lot used for boat storage and vehicle pazking. It is Summit's understanding that a geotextile-type liner underlies the parking lot to control watei. . � The area surroundin the site consists of Lake g Minnetonka to the northeast and southeast, a former commercial business to the southwest, and a residential area to the northwest (Figures 1 � and 2). According to Mr. De Santis, the former business located to the southwest was at one time a gasoline station, and was more recently converted to a transmission repair service station. The building appeared to be abandoned and inactive during recent site visits performed by � Summit. � A water supply well is located approximately 20 feet southwest of the club house (Figure 3). A � well log for this well was not available. According to Mr. De Santis, the water well on his property was constructed approximately 25 years ago and is estimated to be 240 feet deep. � 2.4 Regional Geology and Hydrogeology � Su�cial deposits underlying the site consist predominately of lacustrine sand and loamy sand. Peat underlies organic-rich loam and manmade beaches in some areas. Underlying this material is a thick sequence of glacial till that is characteristic of the Lake Minnetonka region. This � sequence of clay appears to be a confining layer and separates surficial deposits from deeper glacial deposits and the underlying bedrock. The St. Peter Sandstone Formation is present beneath the unconsolidated material and is estimated to be 200 to 400 feet below the ground � ' surface (Balaban, N.H., 1989). }� 3.0 PROJECT RESULTS � 3.1 Excavation On August 13, 1992, Summit personnel observed the removal of a 4,000-gallon capaciry UST � and approximately 70 cubic yazds of petroleum impacted soil. The location of the excavation is illustrated on Figure 2. During the excavation, soil samples were screened for indications of organic vapors using a photoionization detector (PID) equipped with a 10.6 electron volt lamp � � and calibrated for direct reading in parts per million (ppm) of benzene on a volume basis. The instrument was calibrated at the beginning of the day using ambient air as zero gas and 100 ppm isobutylene in air as the calibration gas. Soil samples were screened using a jar headspace � � .