Laserfiche WebLink
t� <br /> EARONMENTAL AUDIT, INC. <br /> 1000-A 0RTEGA WAY • PLACE NTIA, CA92,�"� = �1ft5 <br /> 714/632-8521 FAX:tl"32�579,411, 30 <br /> September 16, 1996 <br /> Project No. 1232 <br /> Michael Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> 1601 East Hazelton Avenue <br /> Stockton, CA 95201-6229 <br /> RE: ADDENDUM TO SOIL VAPOR EXTRACTION PILOT STUDY WORK PLAN <br /> Montgomery Ward Auto Service Center <br /> 5400 Pacific Avenue, Stockton, CA <br /> (Site Code 2163) <br /> Dear Mr. Infurna: <br /> This letter will serve as an Addendum to the Soil Vapor Extraction Pilot Study Work Ian <br /> (dated August 2, 1996) prepared by Environmental Audit, Inc. (EAI) for the above-referenced <br /> site. This Addendum was prepared to address San Joaquin County Public Health Services <br /> (County Health) comments regarding the Work Plan as outlined in County Health's letter dated <br /> August 9, 1996. <br /> Vertical Extent of Soil Contamination <br /> As requested, the boring for vapor extraction well VEW-1B will be extended to a depth of 65 <br /> feet below ground surface (bgs) (see Work Plan, Figure 10). Additional soil samples w 11 be <br /> collected at depth of 50, 55, 60 and 65 feet bgs. Note that most of these soil samples w 11 be <br /> collected from intervals below the current depth to ground water (saturated zone) beneat i the <br /> site. These soil samples will be tested for total petroleum hydrocarbons as gasoline (TP -G) <br /> by modified EPA Method 8015, and benzene, toluene, ethylbenzene and xylenes (BTEX and <br /> methyl tertiary butyl ether (MTBE) by EPA Method 8020. If MTBE is detected in any of the <br /> soil samples by EPA Method 8020, it will be quantified in selected samples by EPA Mtthod <br /> 8260. <br /> To address County Health concerns regarding the vertical extent of contamination between the <br /> two plumes, i.e., former underground storage tanks (USTs) location and former fuel islands <br /> location, soil vapor probe SP-713 will be drilled to 65 feet bgs (see Work Plan, Figure 10). <br /> Additional soil samples will be collected at five-foot intervals from depths of 35 to 65 feel bgs. <br /> Note that soil samples collected from depths greater than 50 feet bgs will be collected from <br /> within the saturated zone. These samples will be tested for TPH-G, BTEX and MTBE as <br /> described above. <br /> 1 ` <br /> PLANNING,ENVIRONMENTAL ANALYSES AND <br /> HAZARDOUS SUBSTANCES MANAGEMENTAND REMEDIATION <br />