ARCHIVED REPORTS XR0001000 - Laserfiche WebLink

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• analyzed for halogenated volatile organics, (EPA 8010 ) Water samples were to analyzed for BTEX, TPH-G & TRPH Detection limits to be in conformance with San Joaquin County EHD specifications On July 7, 1995, Del -Tech Geotechnical Support Services developed all four monitoring wells with a surge block to clear well screens and remove sediments from well Approximately 5 casing volumes, (10+ gallons,) were purged from each well & placed in DOT 17 drums for future use Casings were notched and marked on the north side for future reference, casing caps installed and the traffic covers replaced On July 10, 1995, Del -Tech Geotechnical Support Servicespurged approximately 5 casing volumes of water from each well, measured depth to water, and collected water samples for analysis. Water samples were transported under chain of custody to Sherwood Laboratory with instructions to test for BTEX, THP -G, & TRPH using detection limits as specified by the San Joaquin County EHD Complete details of that work are included as EXHIBIT E The locations of the monitoring wells were determined by 40 Seigfried Engineering, licensed surveyors, using measured features as reference points The tops of the casings of each well were determined within 001, and referenced to MSL datum A portion of that survey is included as EXHIBIT F On August 4, 1995, the abandoned terracotta pipe which was discovered during removal of the septic system in 1993 was removed by Jim Thorpe Ort, Inc , under the supervision of Wm J Hunter, RG, and Linda Turkatte of the San Joaquin County EHD The location of that pipe, shown on PLATE VI as 12" in diameter, was 8" It terminated about 40' north of the office building which occupies the southwest corner of the property The line was buried approximately 2 1/2' below ground level, and 2-3' from, and parallel to, the west edge of the site The pipe did not appear to be broken, it was covered with a thick oily substance, which decreased towards the south end The soil was saturated with an oily substance which had a definite petroleum odor The interior of the pipe contained a mixture of sand & soil which was sticky and mixed with a black, oily, smelly substance A mixture of water and oily residue was noted in the bottom of the excavation at the south terminous of the pipe It is most likely that it drained out of the pipe during removal Soil & water samples were taken for profiling purposes, and the excavation was filled with clean material and the removed spoil temporarily stored on plastic in another location on the property Copies of the laboratory reports of the soil & water 11