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10 February 1993 (GeoAudit CV 43C5-1. 61) Page 2 of 4 TPH as gas was detected in samples B1-20 (93 pg/g) , B1-30 (6, 100 µg/g) and B1-40 (13 Ag/g) . Benzene, toluene and xylene were detected in all samples except B1-60, at levels ranging from 0. 007 µg/g (xylene, B1-50) to 520 µg/g (toluene and xylene, B1-30) . Ethylbenzene was detected in samples B1-20 (3 . 5 µg/g) , B1-30 (170 µg/g) and B1-40 (0. 37 Ag/g) . PROCEDURES According to the PHS/EHD, seasonal high depth to groundwater for the Spring of 1986 was 45 - 50 feet. Therefore, based upon the analytical results, the groundwater may have been impacted. A groundwater investigation is warranted and a minimum of three groundwater monitoring wells must be installed to determine flow direction and gradient and to assess the condition of the groundwater. Details of the groundwater assessment are as follows: . 1) Prepare a site health and safety plan in accordance with the Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities - Prepared by National Institute for Occupational Safety and Health, Occupational Safety and Health Administration, U. S. Coast Guard and U. S. Environmental Protection Agency, October 1985. 2) Notify the EHD 48 hours prior to commencement of any work. 3) Drill three (3) vertical borings to a depth of 70 feet utilizing a hollow-stem auger drill rig. The estimated boring locations are depicted on Figure 2 . 4) Decontaminate sampling equipment in a tri-sodium phosphate solution (TSP) and rinse twice with water prior to each sampling run. 5) Preserve soil samples in the lead brass tube by covering both ends with aluminum foil, capping, and sealing with tape. 6) Label and log soil samples on a chain-of-custody form. 7) Store samples under ice pending delivery to a state-certified laboratory. • 8) Monitor auger returns and soil sample duplicates for the presence of volatile organics using a photo-ionization detector (PSD) .