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TAIT Environmental Management, Inc. <br /> Environmental - Enaineering Compliance <br /> March 6, 2001 <br /> Ms. Kerry Wasson 7 . <br /> County of San Joaquin <br /> Facilities Management Division <br /> 1722 East Scotts Avenue <br /> Stockton, Califoniia 95205 <br /> Subject: Workplan to Perfo temental Soi1'and Groun"ater-Contamination <br /> Assessment, San Coa uin County Motor Pool Facility; 1810 East Haiglton <br /> � Avenue, Stoc ` on, Cs fornia <br /> V <br /> �ar <br /> no 1: j <br /> { <br /> workplan n <br /> I"a ironme�ital M nae ent, Irlc. (l�ELh <br /> leas to su m�t thlo behalf <br /> f th Coun of� Sa oaquin to to <br /> a' supplemental soil and <br /> gr un at r of <br /> assessment at the San f oaquini un Motor Pgol facility <br /> � aZ al 1610 Eas H zelton Avenin, Stockton;San Joagluln Zounty, California. <br /> t` J i t <br /> 6ACI�C RO' N[� <br /> t ( <br /> This,/wrk plan h beeniiprepared based on the results of a site assessment conducted b <br /> TEM dijrirg the a iod 4March — April 1999. The re�uljs(`of the si�e arse sment wer <br /> reported by TEM to the San Joaquin County Public Health Services, Environmental Health <br /> Division in the Site Assessment Report for San Joaquin County Motor Pool Facility, dated <br /> May 11, 1999. Overall, the results of the site assessment found elevated concentrations of <br /> Total Petroleum Hydrocarbons as Gasoline (TPH-G); Benzene, Toluene, Ethylbenzene, <br /> Total Xylenes (BTEX); and Methyl-tert-Butyl Ether (MTBE) in the soil and groundwater. <br /> The San Joaquin County Public Health Services, Environmental Health Division reviewed <br /> the report and in correspondence dated August 18, 1999 directed that the lateral and <br /> vertical extent of soil and groundwater contamination be delineated at the Site. <br /> TECHNICAL APPROACH <br /> The supplementary contamination assessment will consist of two phases. Phase One will <br /> involve drilling exploratory borings on a grid pattern to delineate the lateral and vertical <br /> extent of soil and groundwater contamination. Phase Two will involve locating and <br /> installing groundwater remediation and plume monitoring wells based on the results of <br /> Phase One. <br /> 701 North Parkcenter Drive • Santa Ana, California 92705 • (714)560-8200 • (714)560-8235 fax <br /> Regional Offices. San Diego -Concord •Sacramento •Phoenix -Reno <br /> www.TAIT.com <br />