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PACIFIC <br /> ENVIRONMENTAL <br /> GROUP INC. <br /> t I ! A,410: 48 <br /> October 6, 1995 <br /> Project 310-001.31 <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 388 <br /> 304 Fast Weber Avenue <br /> Stockton, California 95201-388 <br /> i <br /> Re: Well Permit Variance Request <br /> Former Unocal Bulk Plant 0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> Dear Ms. Meays: <br /> This letter has been prepared by Pacific Environmental Group, Inc. (PACIFIC), on <br /> behalf of Union Oil Company of California (d.b.a. Unocal), to formally request a permit <br /> variance for the installation of 15 vent,and 25 sparge probes at the site referenced above <br /> (Figure 1). These driven points will be installed as part of Unocal's commitment to <br /> remediate petroleum hydrocarbon-impacted soil and groundwater. <br /> PACIFIC acknowledges California Well Standards Bulletin 74-90, and San Joaquin <br /> County Development Title, Chapter 9-1115.3 and the Standards of San Joaquin County <br /> Public Health Services, Environmental Health Division. PACIFIC realizes that <br /> California Well Standards Section 9 C states "a minimum of two inches of sealing <br /> material shall be maintained between all casing and the borehole wall, within the <br /> interval to be sealed, except as noted in Section 9 of the Water Well Standards. At least <br /> two inches of sealing material shall be maintained between all "casings" in a borehole, t <br /> within the interval to be sealed unless otherwise approved by the enforcing agency. " <br /> PACIFIC requests a variance to allow the installation of 1/2-inch (vent point) and <br /> 3/4-inch (sparge point) Schedule 40 PVC inside a 1-1/2-inch diameter steel drive pipe. <br /> The vent points will have a total depth of 10 feet and will be screened from 4 feet to 8 to <br /> 10 feet (lithology dependent)below ground surface (bgs). The sparge points will have a <br /> total depth of 14 feet and will be screened from 12 to 14 feet bgs. The upper two feet of <br /> the seal for each probe will be hand augered to a six-inch diameter and filled with <br /> 2025 Gateway Place, Suite 440, San Jose,California 95110 (408)441-7500 FAX(408)441-7539 <br />