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Sacramento Insulation Contractors Project No. EOC-96-028 �I GOAL AND TECHNICAL APPROACH During the summer of 1996, Mr. Harlin Knoll, Senior Registered Environmental Health Specialist with the PHS, notified SIC that an open UST case existed on the subject property and that billing for regulatory services for oversight of the open case would occur from the State Water Resources Control Board. SIC (Ms. Spencer) contacted EOC and requested that EOC contact Mr. Knoll and determine what services would be required to obtain regulatory site closure or a recommendation of"no further action" by the local health department for the unauthorized I release of petroleum hydrocarbons reported for the property. Mr. Knoll, when contacted by EOC, indicated that SIC needed to perform limited soil and groundwater assessment in the area of the " former location of the UST. In accordance with that request, EOC suggested in a "Work Plan for Hydropunch Services " (dated November 8, 1996)the collection and analysis of soil and groundwater samples on the site. Ms. Spencer and Mr. Knoll concurred with the proposal to ti advance the borings and collect soil and groundwater samples, although Mr. Knoll suggested f that fewer borings, advanced closer to the former UST location, would likely be adequate to provide the required information. EOC verbally amended the Work Plan to include 3 likely borings, all located in or adjacent to the former location of the UST. A copy of the work plan is presented in Appendix A. 1 SUMMARY OF FIELD WORK During the week of November 11, 1996, EOC contacted West Hazmat (drilling contractor) and Mobile One Laboratories, Inc. (mobile laboratory service), a state of California certified j laboratory, and scheduled drilling activities to be performed on the site on November 20, 1996, and completed a site specific health and safety plan for use on the site. On November 14, 1996, EOC contacted "Dig Alert",and obtained Ticket No. 326162 for the performance of excavation services on the site. Representatives of potentially affected utilities visited the site, surveyed marked drilling locations, and indicated no utility conflicts with the excavation of the borings. � r On November 20, 1996, EOC and West Hazmat personnel met at the subject site to perform the boring excavation services. Prior to beginning the field work, EOC personnel presented and explained to the field personnel the site specific health and safety plan and the project goals. Reviewing information from previously supplied reports, EOC personnel performed a visual survey of the ground surface on the east side of the warehouse in an attempt to identify the probable location of the former tank excavation and to site the location for Boring B1. In accordance with PHS Permit Number 010978, Boring B1 was advanced at a location approximately 58 feet south and 16 feet east of the northeast comer of the warehouse. The boring was advanced to an approximate depth of 60 feet bgs. This location was chosen based f on the dimensions in a sketch drawn by Blaine Tech Services, Inc. at the time of the tank removal and on observed patches in the asphalt surface. The location of the boring is presented on the Site Plan, Figure 2. A copy of the approved boring permit is included in Appendix B. I 1 1 j Eleven soil samples were collected from this boring at approximate 5 foot intervals beginning at a depth of 5 feet bgs with 5 of the soil samples submitted to the onsite mobile laboratory for chemical analysis. Soil samples SICS-131-3 (131-3), 131-5, 131-7, 131-9, and B1-11, collected from depths of 15 feet, 25 feet, 35 feet, 45 feet, and 55 feet bgs, respectively, were analyzed for the presence of TPH and BTEX using the Department of Health Services (DHS)TPH Method and F+ EPA Method 8020. Detectable levels of TPH and BTEX were not present in any of the soil E samples analyzed from this boring. The laboratory reported detection limits were 1 mg/kg for f� TPH gasoline analysis; 10 mg/kg for TPH diesel analysis; 0.005 mg/kg for benzene, EnvirOmega Consultants 2 December 11,1996 I