FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

L.e CO�tP E'aARi+ht�)qC L �aIES INC y 1 fi [r +t� lQt Circle Suite I Stockton CA 95206 03 AUG _ "orae 00.234.0518 FAX 209.234.0538 CONDOR www.condorearth.com July 23, 2003 Ms. Donna Heran San Joaquin County Environmental Health Department 304 E. Weber Avenue, 3d Floor Stockton, CA 95202 Re: Report for Groundwater Monitor Well Sampling and Groundwater Investigation, Pilkington North America,500 East Louise,Lathrop,San Joaquin County,California Condor Project No. 3151J Dear Ms. Heran: This is a report of findings for the fieldwork conducted at two Underground Storage Tank(UST) sites at the above referenced facility (Figure 1, Attachment A). Condor Earth Technologies, Inc. (Condor) is submitting this report in response to your April .I1, 2003 letter to Mr. Mike Bowles, formerly with Pilkington North America (PNA). This report includes site background information, a description of the fieldwork and laboratory analyses, a description of the results of the work, and a summary with recommendations. The locations of both UST sites are shown in Figure 2, Attachment A. The site of the 1986 and 1987 UST removals is shown in Figure 3, Attachment A. The site of the 1997 UST removal is shown in Figure 4, Attachment A. The groundwater gradient measured at the 1986/1987 UST removal site during the current investigation activities is shown in Figure 5, Attachment A. Field forms completed during the current investigation activities (boring logs,monitor well sampling forms, and the groundwater elevation measurement form) are included as Attachment B. Laboratory analytical reports for the soil and groundwater samples collected during the current investigation activities(analytical result certificates and chain-of-custody records) are also included as Attachment C. Your April 11, 2003 letter requested the submittal of a work plan by June 1, 2003 to describe monitor well sampling at the 1986/1987 UST removal site and groundwater investigation at the 1997 UST removal site. In response, Condor prepared the Work Plan for Groundwater Monitor Well Sampling and Groundwater Investigation, dated May 9, 2003, describing proposed procedures for conducting the requested sampling and groundwater investigation activities. The proposed work included sampling of monitor wells MW-17 and MW-18 at the 1986/1987 UST removal site and groundwater sample collection from five direct push borings at the 1997 UST removal site. In a cover letter for the work plan dated May 28, 2003, Condor indicated that although the work plan described measures for conducting the requested fieldwork at the site associated with the 1986/1987 UST removal site, Condor was requesting site closure based on historical soil and groundwater data. In a letter dated June 4, 2003 Ms. Margaret Lagorio of the San Joaquin County Environmental Health Department (SJCEHD) indicated that the SJCEHD did not agree with closure of the 1986/1987 UST removal site and the work described in the work plan was approved.