ARCHIVED REPORTS XR0012868 - Laserfiche WebLink

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1 TPHg (EPA 5030/8015M, ) & TEPH (EPA 3540/8015M ) ' On September 16, 1996, Del-Tech Geotechnical Support Services developed, purged, tested, & sampled the well Water depths were ' measured for the other 8 wells the same day so that the ground- water gradient could be accurately determined A copy of that work is included as EXHIBIT H ' The elevations and coordinates of the four new wells, (#6 , #7 , #8, & #9 , ) were determined by a licensed surveyor, PLATE IV is adapted from that site survey A blueprint of the survey ' prepared by Seigfried & Associates is included as EXHIBIT J only in the copy of this report submitted to the RWQCB staff Additional copies can be obtained upon request ' DISCUSSION OF RESULTS OF WORK PERFORMED IN JULY & SEPTEMBER, 1996 TABLE XIV summarizes the results of soil samples taken from MW-6 , 7, 8 , & 9 , laboratory sheets, QA/QC, and custody chains are included as EXHIBITS D & G All soil samples from monitoring wells 6 & 7 were below detection limits for BTEX & TPHg TEPH as motor oil (6 0 mg/kg, ) & diesel (6 0 mg/kg, ) was present in MW-6 at 101611 , and motor oil at 5 0 mg/kg from the sample at 21 ' Soil samples from MW--7 at 11 ' measured motor oil at 12 0 mg/kg, and 5 0 mg/kg at 16 ' Soil samples taken at 51611 , 11 ' , & 16 ' from MW-8, located dust west of the shop building and near the removed septic system, were ND for BTEX & TPHg TEPH as motor oil ' was measured at 15 0 mg/kg from the sample at 111 ; the ones taken at 516" and 16 ' were below detection limits However the sample from 211 , which is close to the capillary fringe and in the "smear zone, " measured benzene at 5 0 ug/kg, toluene at 60 0 ug/kg, xylene at 200 ug/kg, and TPHg at X10 0 mg/kg Ethylben- zene was not detected TEPH as motor oil was measured at 2195 mg/kg from sample at 211 , and diesel at 80 0 mg/kg The heavier components are consistent with previous samples taken after removal of the septic tanks and leach lines The lighter constituents, characteristic of gasoline, had been detected during septic tank removal operations, and from some water I` samples taken from MW-1 & 2 , and auger hole "A'" The source for those compounds was not known at the time the previous work was done f Soil samples taken from MW-9, located about 45 ' west of the Independent Trucking property at 1245 W Charter Way, on the site occupied by JM Equipment Co. , revealed the presence of high levels of gasoline in both soil and groundwater Benzene was measured at 39 ug/kg at 51611 , 2 , 140 ug/kg at 101611 , 4, 430 ug/kg 8