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J . H . KLEIN FELDER & ASSOCIATES GEOTECHNICAL CONSULTANTS . MATERIALS TESTING ENVIRONMENTAL RESOURCES 9795 BUSINESS PARK DRWE SUITE D SACRAMENTO CA95B271794 f 9161 366 1 741 May 29, 1987 File: 24-2053-2 Mr. John Johnson The Customer Co. P.O. Box 886 Benicia, California 94510 SUBJECT: Food and Liquor Store 76, Manteca, California Dear J.J. : A PIA screening survey was conducted of the soil undergoing controlled aeration at the Manteca Sand and Gravel yard located at 812 Moffat Blvd. , Manteca, California. Approximately 324 cubic yards of soil stored at the site will be aerated according to the guidelines specified by the San Joaquin County Air Pollution Control District. On May 22, 1986 approximately 60 cubic yards of soil were spread from 6 inches to I- foot thick. The soil was turned a minimum of two times a day. • The PID survey was conducted by a Kleinfelder environmental geologist on May 28, 1987. Soil samples were screened at 12 sample points in the spread soil. No readings were registered from 10 of the 12 soil samples screened. Sample point SP-02 had a PID reading of 126 parts per million by volume (ppmv) and sample point SP-12 had a PID reading of 47 ppmv. The locations of the sample points and PID screening results are presented on the soil survey map (Plate 1) . It should be noted that sample points SP-02 and SP-12 are approximately 5 feet apart and 0 ppmv readings were registered within 5 feet of the two positive readings. Earlier PID screenings and confirmationn soil sampling have been conducted for this project. Some of the previous PID and confirmation lab results are presented below: o PID screening of excavation at Food & Liquor site in Manteca on April 2, 1987. SP-11 3.5 ppmv TPH ND SP-10 1 ppmv TPH ND SP-12 170 ppmv TPH ND SP-13 0 ppmv TPH ND SP-15 0 ppmv TPH ND A S J I.s • i r