SKYPARK COMMERCIAL PROPERTIES COMMUNITY UPDATE Los Angeles Regional - PowerPoint PPT Presentation

SKYPARK COMMERCIAL PROPERTIES COMMUNITY UPDATE Los Angeles Regional Water Quality Control Board Remote Community Meeting July 30, 2020 1

AG ENDA • Welcome and Introductions • Meeting Ground Rules: How to Participate • Presentation • Questions and Answers 2

WEL CO ME Los Angeles Regional Water Quality Control Board Chair Irma Muñoz 3

HO W T O PART ICIPAT E Type your question in the “Q&A” feature on the screen 4 4

L O S ANG EL ES REG IO NAL WAT E R QUAL IT Y CONT ROL BO ARD’S RO L E • Who is the Los Angeles Regional Water Quality Control Board? • Mission Statement • What do we do? 5

O FFICE O F ENVIRO NMENT AL HEAL T H HAZARD ASSESSMENT ’S RO L E • Who is the Office of Environmental Health Hazard Assessment (OEHHA)? • Mission Statement • What do we do? 6

PRESENT AT IO N O UT L INE • Site Background and Overview • Regulatory History • Results of Investigation Completed • Vapor Intrusion Overview • Screening Level Overview • Next Steps • Schedule 7

SKYPARK CO MMERCIAL PRO PERT IES SIT E MAP 8

SKYPARK CO MMERCIAL PRO PERT IES PRO JECT O VERVIEW Hi- She a r Corpor a tion Prope rty • (2600 Skypa rk Drive ) Manufa c ture s faste ne rs fo r • the a e ro spa c e industry Vo la tile o rg a nic c o mpo unds • (VOCs) le ake d into the g ro und c o nta minating so il, so il va po r, a nd g ro undwa te r Robinson He lic opte r Pr ope r ty (2530 • and 2540 Skypar k Dr ive ) Ma nufa c ture o f ro to rc ra ft a nd • re la te d c o mpo ne nts VOCs sto re d a nd use d a re • so urc e s o f c o nta mina tio n 9

SKYPARK CO MMERCIAL PRO PERT IES PRO JECT O VERVIEW Dasc o E ngine e r ing Pr ope r ty (24707, • 24747, and 24701 Cr e nshaw Boule var d) Ma nufa c ture o f ro to rc ra ft a nd • pre c isio n me c ha nic a l a irc ra ft a nd spa c e c o mpo ne nts VOCs sto re d a nd use d a re • so urc e s o f c o nta mina tio n South Bay L e xus Pr ope r ty (24777 • and 24751 Cr e nshaw Boule var d) Histo ric a l o pe ra tio ns inc lude • ma nufa c turing o f a irc ra ft, missile s a nd the ir c o mpo ne nts VOCs sto re d a nd use d a re • so urc e s o f c o nta mina tio n 10

REG UL AT O RY HIST O RY SUMMARY  1991- Site inve stig a tion be g a n  1999- Soil va por e xtra c tion (SVE ) syste m c omme nc e d ope ra tion a t the Hi- She a r prope rty  2009- Orde r re quiring inve stig a tion issue d to Hi- She a r  2013- T e ste d e nha nc e d biore me dia tion to re me dia te VOCs in g roundwa te r  2018- Soil, Soil Va por a nd Groundwa te r De line a tion Work Pla n submitte d  2019- Soil, Soil Va por a nd Groundwa te r De line a tion Workpla n a pprove d  2020  Orde r re quiring inve stig a tion of e a st a dja c e nt prope rtie s of Hi- She a r  Orde r re quiring va por intrusion a sse ssme nt of Skypa rk Comme rc ia l Prope rtie s 11

HOW DOE S CONT AMINAT ION SPRE AD AT A SIT E ? Re le ase at site Impac ts to soil Impac ts to soil vapor Image fr om L ivingston County He alth De par tme nt Impac ts to gr oundwate r 12

WHAT ARE VOCs? C O MMO N HO USEHO L D SO URC ES O F VO L AT IL E O RG A NIC C O MPO UNDS Volatile Or ganic Compounds (VOCs) • Air fr e she ne r s, c andle s, pe r fume • Che mic a ls tha t pa ss e a sily fro m a liquid • Hair spr ay, hair dye , ae r osolize d into a g a s sta te pr oduc ts • Commonly use d in industry a nd in the • Paints, var nishe s and lac que r s home • Adhe sive s, glue s, mar ke r s • VOCs in so il and g roundwa te r can • Cle aning age nts (e .g., ble ac h, evapor ate a s va pors a nd can c olle c t unde r ammonia) building s pote ntia lly a ffe c ting the qua lity • Rubbe r c e me nt and e poxy adhe sive s of indoor air • Paint and stain r e move r s • Car pe t/ r ug/ upholste r y c le ane r s T r ichlor oethylene (T CE ) • Re fr ige r ant • VOC use d fo r de g re a sing me ta l pa rts • Inse c tic ide s, fungic ide s and • Also use d in c onsume r produc ts pe stic ide s • F lame r e tar dant fabr ic s T etr achlor oethylene (P CE ) • VOC use d in c lothe s dry c le aning and • F ur nitur e polish and floor polish me ta l de g re a sing • Dr y c le aning c he mic als • Also use d to make o the r c he mic als and Sour c e - Califor nia Wate r Boar ds found in some c onsume r produc ts 13

2018 Work Pla n Sc ope of Work So il Vapo r Pro be L o c atio ns 14

2018 Work Pla n Sc ope of Work Gro undwate r Mo nito ring We ll L o c atio ns 15

SO IL VAPO R INVEST IG AT IO N RESUL T S T O DAT E 16

SO IL VAPO R INVEST IG AT IO N RESUL T S T O DAT E 17

SO IL VAPO R INVEST IG AT IO N RESUL T S T O DAT E 18

G RO UNDWAT ER INVEST IG AT IO N RESUL T S T O DAT E 19

G RO UNDWAT ER INVEST IG AT IO N RESUL T S T O DAT E 20

VAPOR INT RUSION CONCE PT UAL MODE L Source: CalEPA 21

SCRE E NING L E VE L S (SL ) Exposure Toxicity (Dose) Acceptable Risk Level Screening Level 22

SCRE E NING L E VE L S (SL ) • Prioritize efforts where the most significant problems have been identified at contaminated sites • A chemical present at concentrations above its corresponding SL does not mean there is an immediate threat but it does mean additional evaluation is generally necessary • SLs are very stringent and have multiple levels of assumptions built in to be protective of public health • SLs are updated periodically 23

SCRE E NING L E VE L S Long-Term Exposure ScreeningLevels T C E Sub- sla b/ Soil Va por Indo o r Air 16 µg / m 3 0.48 µg / m 3 Re side ntial 100 µg / m 3 3 µg / m 3 Co mme rc ia l PC E Sub- sla b/ Soil Va por Indo o r Air 15 µg / m 3 0.47 µg / m 3 Re side ntial Co mme rc ia l 67 µg / m 3 2 µg / m 3 Short-Term Exposure ScreeningLevels T C E Sub- sla b/ Soil Va por Indo o r Air Exposur e — Indo o r Air Exposure Acceler ated Exp o sure — Urg e nt 67 µg / m 3 2 µg / m 3 6 µg / m 3 Re side ntial 267 µg / m 3 8 µg / m 3 24 µg / m 3 Co mme rc ial 24

NE XT ST E PS • Comple te the wor k pr opose d in the 2018 Wor k Pla n • Conduc t indoor air and subslab vapor sampling of se le c t c omme r c ial and r e side ntial pr ope r tie s • Re sume onsite r e me diation a t the Hi- She ar Pr ope r ty 25

ARE A T O BE E VAL UAT E D F OR VAPOR INT RUSION I ndo o r Air and Subslab Vapo r L o c atio ns 26

ARE A T O BE E VAL UAT E D F OR VAPOR INT RUSION 27

INDO O R AIR AND SUBSL AB SAMPL ING Sampling Pr oc e ss  I ndo o r Air Sa mple s  Building surve y: pre - sa mpling q ue stio nna ire  I de ntific a tio n o f ho use ho ld ite ms tha t c o nta in VOCs  Pla c e me nt o f c a niste rs in ta rg e te d a re a s  L e a ve c a niste rs fo r 24- ho urs to c o lle c t a ir(8- Source: Santa Ana Regional Water ho urs fo r b usine ss) Quality Control  Board Re turn to re trie ve c a niste rs  Sub -sla b (dire c tly b e ne a th fo unda tio n, typic a lly in g a ra g e ) o r pe rime te r so il va po r sa mple s c o lle c te d (o utside ) fo r c o rre la tio n with indo o r a ir sa mple s 28

VAPO R INT RUSIO N MIT IG AT IO N MEASURES Air pur ifie r s • Se aling ope nings- filling in c ra c ks in the flo o r • sla b a nd g a ps a ro und pipe s a nd utility line s s- pla c ing she e ts o f stro ng pla stic Vapor bar r ie r • b e ne ath a b uilding to pre ve nt va po r e ntry Passive ve nting -insta lling a ve nting la ye r • b e ne ath a b uilding ization- c o nne c ting a Sub- slab de pr e ssur • b lo we r to a sma ll suc tio n pit dug into the sla b to ve nt va po rs o utdo o rs Source: Santa Ana Regional Water Quality Control Board 29

Upc oming Work Ac tivitie s  2 nd Ha lf of 2020  Co mple te wo rk pro po se d in the 2018 Wo rk Pla n  Co nduc t sub sla b va po r a nd indo o r a ir sa mpling a t the fo llo wing a re a s:  Hi-She a r pro pe rty  Ro b inso n He lic o pte r, Da sc o E ng ine e ring a nd So uth Ba y L e xus pro pe rtie s  Ac c e le ra te d re spo nse zo ne b e twe e n Cre nsha w Blvd a nd 247 th a nd 248 th St in the City o f L o mita  Re sume o pe ra tio n o f the SVE syste m a t the Hi-She a r pro pe rty  2021  Co ntinue va po r intrusio n a sse ssme nt  Co nduc t inte rim re me dia tio n  Pub lic Me e ting 30

Q UEST IO NS & ANSWERS Type your question in the “Q&A” feature on the screen 31

Q&A PANE L IST S • Dr. Arthur He a th, PhD : Site Cle a nup Pro g ra m Ma na g e r, L A Wa te r Bo a rd , PMP : Site Cle a nup Pro g ra m Unit 4 Chie f, L A Wa te r • Jillia n L y, PE Bo a rd • Dr. Jim Ca rlisle , DVM, MSc : T o xic o lo g ist, Ca l E PA Offic e o f E nviro nme nta l He a lth Ha za rd Asse ssme nt (OE HHA) a ma rin Austin : Atto rne y, Offic e o f Chie f Co unse l, Sta te Wa te r • T Bo a rd • Ste ve Va n de r Hove n, PhD, PG : E nviro nme ntal Co nsultant fo r Hi- She ar, Ge ne sis E ngine e ring and Re de ve lo pme nt 32