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1-: <br /> V L.ly1W 1 <br /> APR 2 0 1998 <br /> -4VIRONA9April 17, 1998 <br /> PnMt7FS ENTAL y=A_T' <br /> i SEFV)CEg <br /> Mr.Michael InPoma <br /> San Joaquin County Public Health Services <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> Re: Work Plan-Addendum . . <br /> Shell Service Statme <br /> Stockton, <br /> E. Fremont Street wrer= - <br /> Stackton, California - <br /> WIC k204-75241806 <br /> REDDear Mr.Infuma: /, <br /> Cambria Environmental Technology,Inc.(Cambria)has prepared this Work Plan Addend=in (/ <br /> respoeae to the San Joaquin County Public Health Services (SJCPHS) April 7, 1998 letter <br /> commenting on Cambria's February 28, 1998 Work Plan. <br /> Cannon's previous subsurface investigation at the site did not defin6 the vertical exmm of <br /> petroleum hydrocarbons in the vicinity of the northern-most dispenser island.neer Fremont <br /> Street. The direct-push drilling technique used for Boring SB-2 me with refusal at a depth of <br /> 35.5 feet below grade(fbg). The final soil sample collected from Boring SB-2 contained Total <br /> Purgeable Petroleum Hydrocarbons as gasolme(TPPH) at a concentration of 5,700 ppm and <br /> ND(<5.0 ppm)levels of benzene and methyl-tertiary-butyl-ether(MTBE). Cann ns's February <br /> 28, 1998 Work Plan proposed the installation of a soil boring drilled with hollow-stem augers to <br /> Va,m define the vertical exmm of petroleum hydrocarbons in sail at this dispenser island. In addition, <br /> this boring would be drilled to determine the depth where ground water occurs beneath the site. <br /> L',isaxaonu A ground water sample would be collected from the boring and analyzed to determine if - <br /> itarraoax lxc petroleum hydrocarbons have impacted ground water. This investigative approach was based on <br /> information that indicated depth in ground water at this sire may be at 55 to 65 fbg. <br /> ��PamaSrrm. <br /> ,o ii`e_5s Depth to Ground Water <br /> #°1Lv Information obtained from SJCPHS on April 25, 1997 indicated that the depth to ground water <br /> USink at a site located approximately 19 of a mile south of the subject site ranged from 55 to 65 fbg <br /> in recent years. SJCPHS's April 7, 1998 inner indicates thin ground water at the subject site is <br /> know to occur at five feet below the deepest boring drilled at the site. The deepest boring drilled <br /> r..�soroe SAN JOAWR A (;Viar%1Y <br /> ENVIRONMENTAL HEALTH DIVISION <br /> 304 E. Weber Ave,Third Floor <br /> P.O. Box 388,Stockton,CA 9520'-0338 <br /> Phone: (209)468.3420 <br /> ❑Approved <br /> Approved with changes: See Remarks <br /> ❑Disapproved: See Remarks / . �. <br /> Rema s 44'Y' 4&.t,Orr.,k,�-2 4 9imu a<`li`+r�cd <br /> C4Mf,' 7b 4'e <br /> u ) <br /> Date Z04911Zfp-By k <br /> awApproval of these plans extendonly to that <br /> which is shown and described hereon but <br /> does not authorize or approve any omission <br /> / or deviation of requirements of State laws or <br /> ��, <br /> 36 `.ca • Local Ordinances. <br />