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�U rc Delta /. Environmental Consultants, Inc. 1801 Highway 8, Suite 114 St. Paul, MN 55112 612/636-2427 FAX:612/636-8552 October 19, 1989 ��U Minnesota Pollution Control Agency 520 Lafayette Road North St. Paul, MN 55155 Attention: Ms. Linda Tanner Subject: Drilling Update Kenzie Terrace St. Anthony, Minnesota Site 1D# Leak 00000407 Delta No. 10-89-190 Dear Linda: Drilling operations were conducted on September 29 and October 2, 1989 at the subject site. The proposed monitoring well location was selected based on the investigative results reported by Subterranean Engineering Corporation in their July 1988 report. In this report,soil contamination was observed from the ground surface to a depth of 46 feet in test hole TH-4. Since.ground water was measured at 42.5 feet below the ground surface in the augers, monitoring wells were required to evaluate water quality at the site. A monitoring well was installed on August 23, 1989 to a depth of 48.5 feet below the ground surface (Figure 1). This well was installed as part of an anticipated network of monitoring wells. The wells were to be screened just above the bedrock in what appeared to be a perched zone. Drilling was terminated when bedrock was encountered. Subsequent water level measurements indicate that approximately 0.1 foot of water exists in the well. Installation of a monitoring well in the bedrock was proposed. This well was located as close to test hole TH-4 as possible given future parking lot construction considerations. Figure 1 illustrates the monitoring well location relative to test hole TH-4. Drilling procedures adhered to Minnesota Department of Health Well Code guidelines. Drilling took place September 29, 1989. Drilling was performed using mud rotary to 43.5 feet. Hydrocarbon odors were encountered intermittently at 23 feet. Photoionization detector measurements on cuttings did not indicate organic vapors. The casing was set at 44 feet and the annulus grouted. Drilling continued on October 2, 1989. Green limestone was encountered from approximately 43 to 48 feet in depth. A beige limestone was encountered at depths greater than 48 feet. The beige limestone was characterized by lenses of medium to coarse grained sand containing semi- rounded limestone clasts. Drilling continued to a depth of 72 feet. At this depth, the drill stems Practical Solutions to Environmental Concerns