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r -• a+b 'r � ae �'� `A''s'„'�' qty '�'�.-..R. ,� e <br />�� �z-•'���-" —�=-'a-� _ _ � � rt# � � 4 s��; yn as sz�raE}m.�'�.es ,x <br /> a <br /> s <br /> r <br /> WATER ®RK <br /> GEOCHEMICAL•GEOTECHNICAL e ENMRONMEPITAL ^� <br /> r� <br /> August 31, 1990 RECE .0 6 Anna <br /> ENVIRONMENTAL HEALTH <br /> Mr. Harlan F.noll <br /> REWAITi SERVICES <br /> San Joaquin :.oiinty <br /> Public Health Services <br /> P.O. Box 2009 <br /> Stocktor., .'CA 95201 <br /> Re: Soil aeration-Knowles property, 1140 West Hammer' Lane, <br /> Stockton,. CA <br /> Dear.Harlan: <br /> On August 21, 1990 yourself and 3c:hn Giorgi of our office <br /> collected 2 composite samples from the aerating soil at the <br /> Knowles property. The laboratory results reported non-detectably; . <br /> concentrations of BTEX and TPHG. I have included a copy of. the <br /> results for your record <br /> Tile are trying to aerate ss much soil as possible before winter <br /> arrives. We are requesting anproval to back:f}11 the pit with the <br /> aerated soil after:acceptable laboratory results are received: <br /> This will help in reducing the time to begin aerating the batch <br /> of 'soil and 'reducing .the treatment coot To ensure .the soil is <br /> acceptable for backfilling a composite sample will by collected <br /> for every 50 cubic .yards of soil to_ be tested. The sample will <br /> be analyzed for BTEX and TPHG. <br /> The .,soil will be deemed acceptable for backfilling when. the <br /> `laboratory results are below I ppm TPHG and 0.005 ppm BTEX. When <br /> therelis ten feet left to backfill we are requesting a decrease <br /> in clean-up levels to <10., ppm TPHG and <1 ppm BTEX: <br /> We would like to follow this same procedure for every batch of <br /> soil that is aerated and backfilled. We will pass on verbal <br /> results as.,,soon as. we receive them.. If the ;soil is acceptable <br /> we will obt&in verbal approval to backfill the batch. <br /> 1710 MAIN STREET • ESCALON,CA 95320 • (209)838-3507 <br /> FRESNO.CA(209)222.3495 •. RENO.NV(702)788-6830 <br />