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Report on Subsurface Environmental Exploration (Soil Borings) Page 7 A & M Market, 4579 East Acampo Road, Acampo, California November 9, 1992 Quorum Environmental Consultants, Inc , Project 92-120-2 that may have originated from the removed tanks and to evaluate the lateral and vertical extent of them on the west side of the tank cavity ' A permit application was filed with the SJCPHS for advancing soil borings onsite A copy of the permit application is included in Appendix A of this Report The field work described below was performed under the provisions of the Site Safety Plan prepared by Quorum and included in Appendix B of this report Appendix C includes descriptions of the standard protocols for field procedures used including those for site health and safety, field instruments, and drilling methods Any exceptions to these protocols necessitated by site-specific conditions are described below 4.2 Advancement of Soil Borinns ' Five soil bonngs were drilled at the site on October 19, 1992, by West Hazmat Drilling Corporation of Sacramento, California,with the observation of a geologist and an engineer representing Quorum Mr Michael M Collins of the SJCPHS was also present to observe advancement of the borings The soil borings were designated B-1 through B-5, and the locations of the borings are shown on Figure 3, Site Plan Showing Soil Borings The soil borings were located and advanced as described below ' B-1 was located 7 feet from the north end of the tank cavity near the northwest corner It was advanced to 41-112 feet deep, and samples from 30, 35, and 40 feet deep showed no indications of hydrocarbons Samples from this boring from the 20- and 25-foot depths showed readings of 1,300 ppm on the PID, although no odor was noticeable to the representatives of ' Quorum • B-2 was located within 6 feet of the former tank pit to provide information about subsurface conditions within close proximity of the test pit below the ' west end of Tank T1 It was advanced to 41-112 feet deep, and samples from 25 through 40 feet deep showed no indications of hydrocarbons The sample from 15 feet deep had a slight to moderate gasoline odor and exceeded the monitoring capacity of the PID The sample from 20 feet deep had no noticeable odor, but the PID was still not registering after its reading from the 15-foot-deep sample, so no reading was recorded • B-3 was located within 8 feet of the former tank pit to provide informatign about subsurface conditions within close proximity of the test pit below the west end of Tank T3 It was advanced to 41-112 feet deep, and no odors were evident to either the observers or the field instrument.