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Aft <br /> k" KLEINFELDER <br /> September 21, 1987 <br /> File: 24-2062-1 SEP 2 3 1987 <br /> ENVIROMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Dan Moe <br /> San Joaquin Local Health District <br /> 1601 E. Hazelton Avenue <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Dear Mr. Moe: <br /> On Monday, September 28, 1987, Kleinfelder will be installing <br /> approximately 20 passive organic vapor monitors (OVMs) at the Shell <br /> Station located at 3011 Benjamin Holt Drive in Stockton, to qualitatively <br /> assess the presence of volatile organic compounds (VOCs) in the <br /> subsurface. The OVMs are small carbon samplers which adsorb VOCs from <br /> vapors which migrate through the soil. This work is being performed for <br /> the property owner, Lilval Liquidating Trust. Installing the OVMs will <br /> involve the following steps: <br /> o bore approximately 20 shallow (no more than 3 feet deep) holes at <br /> the Shell Station with a vehicle—mounted post—hole auger <br /> o place one OVM in each hole <br /> 0 backfill the bottom 6 inches to 1 foot of the hole with clean <br /> sand <br /> o backfill to the surface with cuttings <br /> p seal hole with a temporary plaster of bentonite powder to reduce <br /> the possibility of surface infiltration <br /> We hope to begin this work at 10:00 a.m. on 28 September 1987. San <br /> Joaquin County personnel are welcome to observe this work. <br /> The OVMs will be left in place for approximately four weeks. They will <br /> then be retrieved by Kleinfelder personnel and submitted to CHEMWEST <br /> Analytical Laboratories, Inc. for analysis by NIOSH methods similar to <br /> Modified EPA Methods 601 and 602. The analytical results will be reported <br /> to San Joaquin County when they become available. <br /> We understand that you are waiving the need for a boring permit for this <br /> work under the condition that we install holes which are no more than 3 <br /> KLEINFELDER 9795 Business Park Drive, Suite C, Sacramento, CA 95627 (916) 366-1701 <br /> rnm-oo-nut — <br />