FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

San Joaquin County EHD September 30, 2004 Page 2 of 3 all 1 % inches in diameter. Groundwater beneath the site was expected to occur at a depth of approximately 40.45 feet bgs and thus was not encountered during drilling. The drilling locations are shown in Figure 2. A copy of the drilling permit issued by EHD is included in Attachment A. Soil samples were collected at 5-foot intervals for soil characterization, subjective evaluation of hydrocarbon contamination using a photoionization detector (PID), and possible laboratory analyses. Because no field evidence of contamination (odors, discoloration, and PID readings) was detected in any of the samples, only soil samples from the bottoms of the borings were analyzed for waste constituents. The soil samples were temporarily stored in an ice chest cooled to approximately 4° C, and delivered under chain of custody protocol to Argon Laboratories (DHS Certification No. 2389). Site inspections were conducted by Ms. Lori Duncan and Ms. Margaret Lagorio of EHD during the course of the field work. Subsurface Conditions Soil encountered during drilling generally consisted of silty sand and sandy silt from the ground surface to approximately 17 to 20 feet bgs, which was underlain by lean to fat clay to a depth of at least 21.5 feet bgs, the maximum depth explored. No hydrocarbon odors, obvious discoloration, or PID readings above background were noted in any of the borings. Boring logs are presented in Attachment B. SOIL ANALYTICAL RESULTS The soil samples were submitted under chain of custody procedures to Argon Laboratories (ELAP 42359). The soil samples collected from beneath the former gasoline USTs and dispensers were analyzed for total petroleum hydrocarbons as gasoline (TPHg) using EPA Method 8015B, for benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA Method 8021B, for Volitile Organic Compounds (VOCs) including methanol, ethanol, 1,2-DCA and EDB using EPA Method 8260B, and for total lead using EPA 7420. The soil sample collected beneath the former waste oil UST was analyzed for constituents listed above and, in addition, was analyzed for Semi-volatile Organic Compounds (SVOCs) using EPA Method 8270C, total oil & grease (O&G) by EPA 503011664, PCBs by EPA Method 8082, and Title 22 Metals by EPA Method 6010B (except mercury, which was analyzed by EPA7471 A). No petroleum hydrocarbon constituents, including VOCs, were detected above the method detection limits in any soil sample. No SVOCs, total oil and grease, or PCBs were detected above their method detection limits in the soil sample collected beneath the waste oil UST. GAGROUNDZE\Howen\SBreport.doc