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C7 C T — b — 9 S F R I 9 : 3 <br /> PACIFIC <br /> ENVIRONMFNTAL <br /> GROUP INC. <br /> October 6, 1495 <br /> Project 314-001.38 <br /> W. Mary Meat's <br /> San Joaquin County Public Health Services <br /> hnvirontncnt4i Health Division <br /> P.O. Box 3581 <br /> 304 Vast Weber Avenue <br /> Stockton, Ca$fornia 95201-388 <br /> Re: Wall Permit Vwidnee Request <br /> FonneriUnocal Bulk Plant 0758 <br /> 8203 Fhst I Ith Street <br /> Tracy, California <br /> Dear Ms. Meat's: <br /> I"his letter has been prepared by Pacific Fnvironmental Croup, Inc. (PACIFIC), on <br /> behalf of Union Oil Company of California(d.b.a. Unocal), to forinally 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 Statxlardy Bulletin 74-90, and San Joaquin <br /> County Dcwelopment'ritle, Chapter 9-1115.3 and the Standards of San Joaquin County <br /> Public I lealth Services, Environmental Health Division. PACIFTC realizes that <br /> C.aftfornia Well Standards Section 9 C states "a minimum of two inches of sealing <br /> lnrrlerial shall be maintained between all casing and the borehole wall, within the <br /> iteterwil to be sealed except as noted in Section 9 of the Water Well Slarnlards. At leas? <br /> ,, <br /> two inches()f senlirtg lmtderial shall be maiulcrirred between all "casin , in a borehole, <br /> wilhin the inlerval to be sealed wiless olhvrwise trplu•oved by the enforcing agency. <br /> PACIFIC requests a variance to allow the installation of 112-inch(vent point)and <br /> 314-inch(sparge point) Schedule 40 PVC inside a I-I/2-inch diameter steel drive pipe. <br /> ]'he vent points will have a total depth of 10 feet and will be screened from 4 feet to 8 to <br /> to 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 feat of <br /> the seal for each probe will be hand augered to a six-inch diameter and filled with <br /> 2025 Galeway Place,Suite 440,San luu,raliturma 9SI 10_ __.. t400)441-75M FAX(408)441-7539 <br />