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.,,., .-tri; r i -_, I>,r �•�rfg N�?-t .�:. .„_>- ..d.,..-.I a. r .'°'";,.... ,,3,{r..A,tiT ,:.:::: •. ':- .±'r_ .. .,,..;,f.a :..,.�, 5 .zr. v- '.,9. ,¢ k. �� r, a�. ..r- 3- P!Y ?�r 1{rr7-.� v l: i r A". yM1`� 'rfTn k� w�:tzT' ' PRELIMINARY INVESTIGATION AND EVALUATION REPORT E9Calo11 Packers., Inc. SR' 1905 k:c;zar_r_y pvurua3 E Escalon, CA 95320 I'D BACKGROUND The Escalon Packers facility in Escalon, California (Figure 1) is a vegetable cannery specializing in tomato processing. Located on the site is an underground concrete vault that was formerly used to store heating oil. The vault was installed in the late 1930's or `, early 1940's, but has not been used since the early 197015. It measures 25' x 10' x 8' and is located beneath the men's restroom building (Figure 2) . The company is seeking permission from the Environmental Health Division (L`tD) of San Joaquin County to abandon the vault in place. Removing it would require demolition of the restroom and valua5le refrigeration equipment that is located on the 'roof of the restroom. In order to determine whether heating oil may have leaked fro,n the vault in the past, soil samples from beneat=h the vault were collected by McCain I,nvironmental under the direction of EHD in August 1991 . The samples were obtained from shallot!: hand-auger borings and analyzed in accord,�rce . ith FPA methods E1015m and 8020. 'Total petroleum hydrocarbons as rro;_or oil were detected at levels up to 9000 mg/kg at a depth of 4 ft, and purgeable aromatic, hydrocarbons (ESTE&X) were detected at levels up to 3,200 Jig/kg (see Tank Closure Neport of WHF Environmental, 13 August 1991) . The results indicar-ed that at, unauthorized release of heating oil had occurred, and assessment of the extent of soil contamination was ti:creforc requi.Yed by San Joaquin EHD. Geological Audit Services (GeoAudit) was subsequently retained by Escalon Packers, inc. , and in January 1992, seven soil samples were collected by GeoAudit from two borings underneath the vault. A Site Assessment Preliminary Repor' was submitted to San Joaquin EHD by GeoAudit on 18 February 1992. Soil contamination in the diesel and motor oil range was detected at levels up to 22,000 mgfkg at a depth of approximately 15 ft. On 13 March 1992, a letter from San Joaquin EHD to Escalon Packers .equested additional investigation to delineate the vertical and , ateral extent of contamination. Six additional soil borings were drilled in May 1992 around the perimeter of the underground vault under the direction of GeoAudit. 2'he results of this investigation are presented in this ieport. 2.0 DEPTH TO GROUNDWATER As reported in our February 1992 Site Assessment Preliminary Report, the depth to groundwater is presently more than 60 ft below grade.