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Environmental allm nt Donna Neran, RENS <br /> '1868 East Flazelton AvenUe <br /> Y Stockton, California 95205-6232 PROGRAM COORDINATORS Robert McClellon,RENS <br /> -- — Jeff Carruesco, RENS, RDI <br /> . u i VIAbbsile www.sjgov.org/�hd ttasey Foley,RENS <br /> C i r Linda Turkatte,RENS <br /> Phone: { 00} 468-3420 <br /> Fax: (209) 464-0138 <br /> June 5, 2012 <br /> Mr. Michael D. & Ms. Sharon Olivarez <br /> 540 Scotts Ave. <br /> Stockton, CA 95203 <br /> Subject: Skips Service Station (former) RO#:0504 <br /> 300 S. California St. CUF#:3492 <br /> Stockton, CA 95203 APN: 14909501 <br /> The San Joaquin County Environmental Health Department (END) has received and reviewed <br /> First Quarter 2012 !Monitoring Report (1St MR2012) and Second QTR 2011 Remediation Status <br /> Report (RSR), both prepared by your consultant Foothill Engineering (FE) on your behalf. in 1" <br /> MR2012, FE recommended that the END consider the site for closure under the recently adopted <br /> Low-Threat Site Closure Policy. <br /> The EHD has reviewed the site data and does not consider your site to be a candidate for closure <br /> under the Love-Threat Site Closure Policy. Contaminant concentrations in the vicinity of extraction <br /> well EW-1, the most impacted well, were 120,000 micrograms per liter (pg/L) total petroleum <br /> hydrocarbons quantified as gasoline (TPHg), and 16,000 pg1L benzene to cite a few of the <br /> chemicals of concern. These concentrations and the estimated mass of residual contaminants <br /> (779 kilograms TPHg) are very high. The plume of dissolved contaminants, including benzene, <br /> extends off-site impacting other parcels. Operation of the remediation system was suspended two <br /> years ago due to contaminant breakthrough in the treatment system, consisting of two canisters of <br /> granular activated carbon (GAC), and due to delayed reimbursement payments from the California <br /> State Water Resources Control Board (SWRCB), and was not a result of achieving asymptotic <br /> conditions. The EHD does not consider the secondary source of contaminants to have been <br /> remediated to the extent practicable, and therefore denies your request for closure under the Low- <br /> Threat Site Closure Policy. <br /> This decision is subject to appeal to the State Water Resources Control Board (State Water <br /> Board), pursuant to H&SC Section 25296.40 (a) (1), (Thompson-Richter Underground Storage <br /> Tank Reform Act -- Senate Bill 562). Please contact the State Water Board Underground Storage <br /> Tank Program at (916) 341-5752 or visit the State Water Board internet website at <br /> ht :llinrww.waterboards.ca.govlusticleanuol�etitions.htmi for information regarding the appeals <br /> process. <br /> In RSH FE proposed improving the extracted groundwater treatment system by adding a <br /> bioreactor to address Cert-butyl alcohol (TBA) that may be released from the canisters of GAC by <br /> displacement by other hydrocarbons, and thereby avoid violating the stringent requirements of the <br /> City of Stockton for discharging treated groundwater. As considerable expense has been incurred <br /> Closure Request Response and Directive Letter 0612 <br />