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`I <br /> GROUM ZERO ANALYSE, INC. <br /> 2291 W. March Lane, Suite 127D r <br /> Stockton, California 95207 .� <br /> k Telephone: (209) 952-3481 v J <br /> Facsunde: (209) 952-9892 <br /> August 15, 1997 <br /> Mr l'or. Rowe <br /> San -c-,4;,;,1 County-Public Health Services <br /> t Envira;...ental Health Division <br /> 445 'Yore: ;:an Joaquin St-eet <br /> r P G ?3: 382 <br /> StccInon, CA 95201-0388 <br /> Su1)Je t Third Quarter 1997 Groundwater Mcmtonng and Sampling Report <br /> Knowles/Roek Property, 102 South Wilson Way, Stockton, California <br /> L. Mr Rowe. <br /> Ucound Zero Analysis, Inc (Ground Zero) has prepame tk is report for groundwater mcnitoring <br /> W samphng performed during the third quarter 1997 at the subject site (Figure 1) Activities <br /> eluded mQmtonng groundwater elevations, purging and sampling groundwater, and analyzing <br /> amples for tQtal petroleum hydrocarbons as gasoline ('I'PHg), benzene, toluene, ethylbenzene, <br /> :�ft1 xylenes (BTEX), and methyl tert-butyl ether (MTBE) <br /> Cgeundwater monitoring was conducted on July 22, 1997 The depth to gro ndwater was <br /> mowared 1n each well and subt_--.;ted from the wellhead elevation to determine groundwater <br /> e',Iyahon Water levels rose an average cf 0 07 feet since last monitored on May 7, 1997. <br /> r'-oi;ndwater flow was generally east-southeast rly at an average gradient of approximately <br /> t 0 002 - 0 003 feet per Foot A grohdwatLer gradient map generated using the July 22, 19`-) ' <br /> r. o inn, data is shown. on Figyrpe 2 Recent ground, iter monitoring d2.iare iu�}:�ar-a� .n <br /> `I Ie L, Ivlomte_-rig,logs arc; included ars At'Achr.;nt A �t <br /> Cg% <br /> a;,4 eco collected groundwater samples from wells MW1 through MW13 on July 22--Ad <br /> E r <br /> 73, 19V7 At least thiee well casing volumes were purged from each well prior to sampling <br /> "',14cal parameters (pH, conductivity, temperature)were monitored during purging and allowed <br /> rv,%,.,bi&prior to �amplipg. Purged water was containeG in 55-gallon drums approved by the <br /> r rtrl_:rtt of Transportaticn and ierntains„on s.`a pendin`; analytical results Purge logs are <br /> prated in Attachment f , <br /> A9?_1�ware priced on ice and traw,N3rted under chain of custody to ArgcI.d <br /> n, bo:a?ones (DHS i <br /> ., #1 "13),where they were analyzed for BTEX and X171-BE using EPS, rre''-icd 8020'and TPHg <br /> u°1-1s7 1-11 IPA method 5015 Recent analytical results of grc indviater samples are <br /> summwtzed z Table 2 Attachment B contains laboratory meport;and-hm afcustcr y documentation , <br />