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4 t <br /> Rli <br /> " HE:CEIVCi1 <br /> - SES 1110 <br /> 4191-E Power Inin Road,Sacramento,CA 95826 (916)452-2901 <br /> App/ied GeoSystems • Fremont •Costa Mesa •Sacramento <br /> September 10, 1987 <br /> 0909MHAN <br /> AGS Job # 870 _2.03 <br /> Mr. Michael Hansen ra <br /> Kayo Oil Company H�ptZH <br /> 900 S. <br /> Cherokee La <br /> Lodi, California 95240 <br /> Subject: Aeration of soil at former Econo Gas Station at 4325 <br /> Washington Street, Stockton, California <br /> Mr. Hansen: <br /> The following is a summary of the results of soil aeration at the <br /> above-referenced site. Soil excavation took place in association <br /> with tank removal operations on July 8, 1987. Further excavation <br /> of the tank cavities took place on July 30, 1987 . Since that <br /> time, aeration of soil has taken place according to guidelines <br /> imposed by the San Joaquin County Air Pollution Control District <br /> (SJCAPCD) and as delineated in our letter to Karen Gustafson of <br /> the SJCAPCD dated July 31, 1987 . <br /> Soil excavated during the tank removal operations was divided <br /> into three piles on the basis of subjective evidence of degree of <br /> contamination. These piles are indicated on the attached <br /> Generalized Site Plan, Plate -1. Composite soil samples <br /> collected from these piles indicated that pile P-1 contained <br /> 126. 06 parts per million (ppm) , P-2 contained 105. 67 ppm, and P-3 <br /> had 6. 69 ppm total volatile hydrocarbons (TVH) . A total of <br /> approximately 60 yards of soil were contained in piles P-1, P-2 , <br /> and P-3 . After notification of the SJCAPCD, the soil was spread <br /> for aeration on July 29, 1987 . On July 30, 1987 , composite soil <br /> samples (S-AERATED-1, IA and 2 ) were collected from a pile <br /> consisting of aerated soil from -1, P-2 , and P-3 . Analysis of <br /> the composite sample showed a level of 8 . 66 ppm TVH, indicating <br /> that aeration had reduced the soil contamination to levels <br /> suitable for the soil to be placed back in the tank excavation. <br /> Further excavation of soil from he area below the former tanks <br /> took place on July 30, 1987 . Soil excavated from below (former <br /> tank T-1 was segregated from soi taken from below former tanks <br /> T-2 and T-3 . Soil from below -1 (sample S-TZ-AERATE) showed <br /> levels of 3 , 584 ppm TVH. Soil fr m below former tanks T-2 and T-- <br /> 3 (sample S-T2 , 3-Aerate A,B, C, D) showed TVH contamination at a <br /> concentration of 1, 364 ppm, <br /> 4 <br />