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Post-it`°Fax 7671 Date$•23 pagoesl I
<br /> To Cl- S-tAOL From 2,7JLJC
<br /> Co./Dept. Co.
<br /> Phone# Phone k
<br /> Fax k Fax#
<br /> ENVIRONMENTAL HEALTH DIVISION
<br /> 304 E. Weber Ave.Third Floor
<br /> P. O. Box 388, Stockton CA 95201-0388 ��C 0��'1 V!��
<br /> Approved � GROUND ZERO ANALYSIS,INC.
<br /> Denied ❑ nI� 2 e
<br /> nt4 main street X599
<br /> W/Conditions SEE 6EJritJ CwalonTdephane:.(209)8398 ENVIFC."IiENTALHEALTH
<br /> Facsimile.(209)0b 9883
<br /> PERMIT/SERVICES
<br /> Date by PIJ �
<br /> July 27, 1999
<br /> I• LOMnNue, S,kMl9 .I&Xl vnoN)TaYL WtaS-S
<br /> Mr.Ran Rowe
<br /> CZUhiZTE"pL`/, ('�x`�yF,./d1�1"ES AaJhWS San Joaquin County Public Health Services
<br /> 1 N ftl.l WLD M4lQ W cl.l.S l S Environmental Health Division
<br /> 304 E.Weber Ave.,3rd FI.
<br /> (�,�c.owawvt7t.D ED 1?",1LjLt1t2W Stockton.CA 95202
<br /> ►T1W S : !J Z)16, 4 J I c�'J t L J L Z Subject: Second Quarter 1999,Report.Knowles/Roek Property, 102 South Wilson Way,
<br /> Stockton,California (Figure 1)
<br /> C']I/EN �AjT ptT�?.TisNs `�
<br /> Dear Mr.Rowe:
<br /> I�OTOJfIA-L TD 66$ERVe yylV-1 yTWfJ . .
<br /> q�fit Ground Zero Analysis.Inc.(Ground Zero)has prepared this report to summarize acnnties doting
<br /> f[W
<br /> TMO SIM PDS51 GL& b Ff'St_6� the second quarter 1999 at the subject site. Groundwater related activities included monitoring
<br /> �jOVQ.Ck•'S C2(D ITuP Ft l(AWL)' groundwater elevations, sampling groundwater, and analyzing samples for total petroleum
<br /> hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene and total xylenes (BTEX).
<br /> Additionally, as requested by San Joaquin County Public Health Services Environmental Health
<br /> Z
<br /> CONTIw6 SUBS o?E.Q*entItU • Division (PHS/EHD), samples from wells MWI, MW7, MW4, MW7, MWII, MW12, and MW13 were analyzed for oxygenates [methyl tert-butyl ether (MTBE), ethyl tert-butyl ether
<br /> P UVID1r QAP1-IUN PCt-C (W mA 4-1T1 (ETBE), di-isopropyl ether (RIPE), tertiary amyl methyl ether (TAME), and tertiary butyl
<br /> DA-nA ) FtJ¢
<br /> alcohoi/tert-butanol(TBA)]using EPA method 8260.
<br /> f.aoT I w2 p1,6trieryntt.t�
<br /> During the second quarter 1999 (April 1 through June 30, 1999), the Soil Vapor Extraction
<br /> Oki 12- 6P/t'eGC A'g SOLL-
<br /> System (VES) operated for 1,914 hours, removing an estimated 550 pounds of hydrocarbons
<br /> L,taot, Jbrst/}T%D7_ PLU rKc s /Zyj r. from the subsurface. Since full time operation began on November 19, 1997 the VES has
<br /> operated for a total of 8,924 hours,removing approximately 12,000 pounds of hydrocarbons from
<br /> `J l(4tA f'x Gev"T. the subsurface. The system was shut down during part of April due to a system component
<br /> failure.
<br /> 3.
<br /> 1ZesP6al1,1fstE ?A-a" _<K6ukl>
<br /> bC,LJNL%EKX * C6j-. .ESi?Wb WMA GROUNDWATER ACTIVITTES
<br /> ?Qc] / -Me IFilu/z, 2 1(iAtz6oAq Groundwater:Monitoring and Sampling
<br /> PWWLC. mtGEi*TntJ IAvTD _1'r" Groundwater monitoring was conducted on May 4, 1999. The depth to groundwater was;
<br /> {off-�ti r"K� x SdJ2(�, measured in each well and subtracted from the wellhead elevation to determine groundwater
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